Netbeans is a freely available integrated development environment. Get Netbeans tutorials using Java with help from a software engineer with broad and extensive experience in this free video clip.
Apache Nutch is an open-source Web crawler application written in the Java programming language. It was developed by the Apache Software Foundation. To use the Apache-developed crawler, you must have Apache Tomcat and Java 1.4 by Sun or IBM installed on your Linux computer. Once installed, use Apache Nutch as a Web crawler to seed a database with a list of a website addresses, just like Internet giants like Google and Yahoo do with their search engines.
Hibernate is a free tool you can use for programming in Java that allows you to map from an object-oriented domain model to a relational database. What this means is that Hibernate serves as a query and retrieval tool that allows you to move information from one type of database to another. You can also use Hibernate in conjunction with Java's scroll function -- allowing you to scroll through the mountains of data to find exactly what you're looking for.
The Magelo Sync application supplements your World of Warcraft gaming experience by providing detailed information about your character and in-game region, as well as tracking your quest log. If you cannot run Magelo Sync, a corrupted installation is the likeliest cause. In addition, Magelo Sync does not run if you have an outdated version of Java.
Axis2, developed and maintained by Apache, is a core engine for Web services that allows you to add Web services interfaces to your Web applications. It can also act as a Web server application. If you want to create a Web service client, you can do it manually or create a Web Service Description Language definition to describe the messages clients should send and expect to receive. In case you are working in a Java environment, Axis has a built-in tool that you can use to convert WSDL to Java.
The "AIML" Chatterbot language lets you incorporate AIM bots in your Java applications. Use these bots to market a website, and to create a fun experience for users. A user can message the bot with AIM and the bot returns answers to the user's questions. You can add links or just incorporate the bot software in your chat software.
Oracle makes it easy for Java developers to incorporate modern cryptography methods into their applications. This allows programmers to either write programs to help users encrypt their data using these methods, or to add layers of security to their own applications. All that Java developers need to learn are the concepts behind modern encryption methods and how to use Oracle's Java Cryptography Architecture, known as JCA.
Tesseract optical character recognition libraries offer developers a method to scan documents and text to an image. You use the Tesseract libraries to store images of documents that you no longer need in hard copy. You use Tesseract libraries in Java by looping through each character and writing the character to a file. To use the libraries, you must include the Java namespace for the OCR functions.
The controller in Java is a centralized mechanism for coordinating multiple user requests to a website. Centralized access helps integrate different services, authenticate security requirement and coordinate business logic when dealing with multiple requests. It requires less duplicate code than a decentralized system and it's easier to maintain. Controllers work in conjunction with a dispatcher that assists in online navigation and a helper or value bean, software that completes the controller's processing tasks.
Hash codes are valuable tools used in identifying and organizing data in large data structures. Using a hashing function, a programmer can produce a value that identifies the data. Because of this, the Java programming language includes a template for implementing hash functions in the object model of the language. This means that programmers can determine hash functions for the objects they create, and use those hash codes for such things as cryptography or data storage.
While HTML is simple to learn and lets programmers create websites quickly, it imposes serious limitations on the potential features of Web pages. JavaServer Pages is software that lets Web developers create more feature-rich websites. Developers can create tables with custom sized grids using only JSP, only HTML code or both.
Prepared statements are a technique used in Java programming that are used to help speed up programs if you run the same operation repeatedly. With a prepared statement, some of the operation is compiled in advance, so each subsequent use of the prepared statement is faster. It takes approximately 65 uses of the same statement within a program to make prepared statements a time-saving operation in an ETL Java Caps program or any other Java-based program, but it can speed up your program if you perform the same operation repeatedly.
While basic File Transfer Protocol, or FTP, operations can be programmed in Java applications, more likely than not you will want to take advantage of already-existing FTP programs. One of theses programs, CuteFTP, is available for free and for most operating systems. Once CuteFTP is on the system, you simply instruct the program to make a sytem call and issue the command to run CuteFTP from the command line.
Creating a pyramid of characters will help you learn how to nest loops together. You can create a pyramid of any size using Java, including a nine-level pyramid.
Programmers can create animation in Java by drawing a series of images to the screen, one after the other. The simplest way to do this is to cycle through images in a collection, so that they create an animation effect. You can accomplish this by looping through an array of images, displaying each image in turn. This method can aid in the creation of animated splash screens for programs, or small parts of Web applications.
JAX-WS is a Java-based application that allows users to create their own Web applications with specific lines of code. One of the features of this application allows users to generate structures -- with Java classes -- from applications that make use of the Web Services Description Language, or WSDL. To perform this operation, you only need to enter a simple command into the application's prompt.
While basic Java programs can run without any outside data, advanced applications need to use files to store or retrieve information. Java code looks in a particular location for a file it will be using, so if a file moves from that location, the program will no longer be able to access its contents. The precise effect this will have on the program depends on what file operation it's trying to perform.
All GoDaddy hosting accounts purchased before July 11, 2011 support the use of Java technology. Java lets you add dynamic components to your website through the use of XML, HTML and JSP. If you have a GoDaddy account that is enabled with Java, you can use Java applications by installing the Java JAR file to the appropriate folder on your server.
Sockets serve as a low-level communications object for Java programs. Using Sockets and their counterparts, ServerSockets, programmers can build simple Java programs that send a listen for data over a computer's ports. Integrating input and output streams into this process allows programmers to process received data. Through this simple setup, the Java programmer can build something like a chat server .
Converting 2-D images to three dimensions in Java 3D may seem like a daunting process. Fortunately, the Java 3D API -- or application programming interface --includes several tools and features to automate much of the conversion. The exact process required depends on your particular image and how you want it to look, but these basic tools will make the conversion as painless and straightforward as possible. After you run them, then you can make the individual nitpicky vector modifications to get your picture looking perfect.
A programmer calculates a checksum for a string or a file to guarantee that file corruption has not occurred. An algorithm is used to generate a specific block of data from the content of the string or the file. Later, other programmers or users recalculate the checksum using the same method and compare the result to the original checksum. It the checksums match, it means the file has not been changed. In Java, "Adler32" modules provide the methods for calculating a checksum from a string.
Programmers typically find string manipulation and comparison one of the less efficient operations to perform in a program. String comparisons in particular can become troublesome for large strings, or working with strings from different languages. However, programmers using the "Collator" class can compare strings in a variety of languages. The Collator class offers tools to compare strings in a variety of locales that take into account the differences in such syntactical units as capitalization and accents.
Java "for" loops are powerful iteration structures, in that they allow programmers to create controlled patterns with definite boundaries. This means that they become extremely useful when formatting data in tables or columns. To demonstrate this capability, you can build a more complex pattern with "for" loops in order to show how many loops can work together to build shapes. A few "for" loops can, with strategic placement, form a basic pyramid out of text or textual symbols.
By calculating the midpoint of the sides of a triangle, you can connect those midpoints to determine smaller sub-triangles. You accomplish this in Java by beginning with the three coordinates of a triangle, calculating the differences of those coordinates to find the midpoints of all the sides, and then constructing a new triangle out of those midpoints.
Though designing GUIs can be a considerable chore even for the experienced programmer, Jigloo makes the process quick and intuitive. Jigloo is a plug-in for the Java Developer Environment Eclipse, providing a WYSIWYG interface as well as the ability to quickly change the properties of GUI elements. Jigloo is compatible both with the Java AWT library and the more advanced Swing library. Components that are unique to Swing are prefaced with a "J;" for example, a "JTextField" is the Swing representation of a text field element.
Rollover buttons add responsiveness to applications by responding to a user's mouse as it rolls over, even if the user does not click the button. With Java's MouseListener class you can make buttons that alter their text or icon when they are rolled over. Java handles mouse rollover events in the same way that it handles mouse click events, so you can program your button's rollover behavior to be anything that a button's mouse click behavior can be.
Selenium is an automated testing tool that allows programmers to remotely control a Web browser from their program. Selenium can interact with programs in a number of different languages including Java. In order to use Selenium with Java you will need to create a new project with the Selenium client library and use the proper commands to access Selenium's WebDriver.
If you have a collection of numbers in a Java program and want to display them in ascending order, you can use Java language constructs including arrays. By storing the numbers in an array variable, then calling a method of the Arrays class, you can sort the numbers into ascending order before displaying them. How you display your numbers will depend on the details of your application, but you can output them to a user interface or the system console.
If you have a Java program that relies on Windows system files to run, you can use the jGrasp function to import those class files into the program so that it would have direct access to them. This type of situation is common when you're designing Java programs that run on Windows, as well as browser extensions that bridge the gap between web programs and local applications.
The Java programming language allows software engineers to develop client-side applications that can run in both desktop and web-based computing environments. Java-generated pages can be modified by using Java code to replace items such as characters on the page based on variables and other backend code changes. This can be useful if you want to generate random values for identification uses and security keys used in other parts of your Java application.
The Java RegEx command lets you parse data from a string to determine if the content in the string is an integer number. You use this command to confirm that the entry from your readers is actually a number, so the code does not return an error if you attempt to perform calculations on invalid entries. You create a small function to verify the value and return the Boolean value "true" if the entry is indeed an integer.
A list of JAR projects displays in the Java Eclipse navigation panel, so you can get any JAR library included in the Java program. A JAR file is an external Java library that you import and install in your Java application. You can then call the functions and properties from the JAR file. To figure out the functions and properties you want to call, you view the JAR package from the Eclipse navigation panel.
A data source name (DSN) provides your programs with a pre-programmed connection to a database. You use the DSN in Java to connect to a database without the need to program a username, password or driver. The DSN contains all the necessary information, and it is stored on your computer. DSNs are used in office environments for custom Java applications.
The string class in Java provides a method to check whether two string values are equal. Using this method in conjunction with a loop and conditional statement, your program can find the index of the element matching a specific string in an array. To match the string, you first need to implement a loop to iterate through the array structure. Each time the loop iterates, your code can compare the current string value to the one you are looking for. The loop can continue until it finds the string or reaches the end of the structure.
Java documents are text files that contain a set of instructions that are interpreted by the Java compiler and turned into Java bytecode. You can edit your Java source code using Windows' built-in Notepad text editor. Java ignores white spaces, so you can create new lines in your Java source code to help improve document readability.
If you are used to coding in C, C++ or C#, then you can insert borders (such as CP480-style ones) by implementing the BorderControls. If you are switching to Java, you will need to use a different method to insert borders to your applets. The basic border can be inserted using a very basic level of code that places a border around your panel object. This can be expanded using the standard Java commands for greater control and use.
Netbeans provides Java programmers with the ability to create new classes using a wizard. The wizard creates the new Java class and its associated file, and you must must then set up the class as the "abstract" object type. Abstract classes are hidden within the parent class, so you cannot call the abstract class from external objects.
Java programmers use the NetBeans Interactive Development Environment, or IDE, to aid them in constructing large and complex Java projects. NetBeans also allows programmers to design Graphical User Interfaces, or GUIs, using a visual editor, rather than creating one strictly by hand. Because of this capability, you can create GUIs and insert things such as images quite easily.
Java programs can carry out various input and output operations with files. Using the Scanner class, you can create a program to read the content of a file as individual integers. In order to read files into your Java programs successfully, you need to protect your processing from input and output exceptions using try and catch code blocks. Once you have a file open within your program, with the necessary precautions in place, reading the content as integer values is usually straightforward.
Classes are types of data. Casts are used to identify objects retrieved for arrays, lists and collections. Casts can also convert data from one type to another. Class cast exceptions or classcastexception errors are generated by Java Virtual Machine (JVM) when attempting to convert incompatible data types.
Using the Scanner class in Java, you can read data from external sources such as text files. The process only requires a few straightforward steps, but you do need to tailor it to suit your own file and program. The Java platform provides standard libraries you can use for input and output operations. By first creating instances of the classes in these libraries and then using methods of the Scanner class to read your file content, you can acquire the content in a way that suits the logic of your program.
In Java and other object-oriented programming languages, the "static" keyword denotes resources that are not tied to a particular instance of an object. Instead, they are associated with a single class. They can represent constants or utility methods. Some classes, such as the Java API Math class, consist entirely of static methods and variables.
Port numbers are assigned to applications and their communications on a Local Area Network to help computers communicate with each other. Each time data is sent, it contains the computer's IP address and port number to give the recipient the ability to verify the sender's identity. Java is a programming language that gets its syntax from the "C" and "C++" languages but has a simpler object model. Through a Java script, you can find another system port number.
Multidimensional arrays let you contain several values in separate sections of a variable. Multidimensional arrays provide programmers with a method of containing several values without the need to create variables for each value. Programmers use arrays for hundreds of values, and these values can be displayed in a loop function or stored for later processing.
Java makes lots of programming tasks quite simple, from working with XML to connecting to remote database servers. Another task that Java makes easy to perform is manipulating images. The Java 2D classes, initially introduced in Java 1.2, provide extensive graphics functionality, from working with Shapes to performing transformations on coordinates, which are useful for rotating an image. Taken in tandem with the regular Java API for loading and manipulating images, it's easy to provide a program with the ability to manipulate a photo or drawing.
The Java language relies heavily on elements called "operators." There are several different types of operator: Assignment, Arithmetic and Unary Operators. These are also the most common operators. The + Operator falls under the Additive and Unary categories, and has multiple uses.
Java is a versatile and widely used computer programming language that allows users to produce cross-platform software with one source code. The vast library of tools and pre-coded classes allow for a programmer to code fairly complex programs simply by using pre-defined instruction sets included in the Java framework. Writing a program to average a set number of grades involves prompting for, then saving, user input. The program then performs averaging arithmetic on that input and returns the result to the user.
You can now complete numerous tasks through Java Database Connectivity (JDBC) Application Programming Interface (API) using database CLOB columns. CLOB, which stands for "Character Large OBject," is a data tool used for storing and retrieving large amounts of text data in character format. A CLOB is capable of storing up to 128 terabytes of character data in the database. Its full compatibility with Java makes it a preferred choice by many software developers.
Thanks to new technologies, you don't have to rely too much on just one application to open the file you are trying to access, such as a PDF file. You can open and read this format using a Java and an iText application programming interface, or API. With iText API, you have the ability to generate and read PDF files.
A "float" Java variable lets you use decimal numbers in your results. You can format the decimal number as a currency in your Java forms, so users see the dollar symbol and the separating comma for numbers over 999. The "NumberFormat" class contains a function to display float currency values.
One of the benefits of learning to program in a cross-platform language, such as Java, is that if you need a specialized tool, such as a quiz program that will randomly select its items from a bank of questions, you can make it yourself. It is also a useful project if you are a beginner with Java, because it introduces you to the language's random utility and gives you practice with control structures such as loops.
The Java class Random is a set of utilities designed to generate random values. While the most common use of a utility from class Random is to generate random numbers, one of the utilities in class Random is to generate random Boolean, or logical true/false, values. Random value generators can be used for a variety of reasons, from statistical sampling to writing a "Word of the Day" function. Although class Random is a set of utilities, their use is governed by a similar set of rules.
A common problem in computer geometry is to determine whether a given point in the plane is contained within a given circle. The most straightforward way to make that determination is to use the definition of a circle: the set of points that is at a constant distance from the circle's center (that distance is the circle's "radius"). You can perform this test in the Java programming language.
The standard libraries for the Java programming language include pre-defined classes and methods for many types of applications. In particular, the Abstract Window Toolkit (AWT) is a hierarchy of classes created for manipulating windows and their contents as part of a graphical user interface. One of the concepts implemented by AWT is that of a "canvas" -- a rectangular area where the Java code can draw using AWT methods. You can define and populate canvases in your Java applications.
JSplitPanel is a component in the Java programming language that displays two panels, split either horizontally or vertically. Further components can be added to each pane with their own independent functionality. Like all Java components, a programmer can set dimensions of the split panel by specifying the preferred width and height in number of pixels and indicated the pixel coordinate where the drawn panel originates on the screen. Sometimes a programmer may wish to hide one panel for later display while allow the other panel to remain visible. This is done by adding adding JButtons with special functionality to the…
As of 2011, Blackberry offers BES for large organizations that need a high level of IT control. BES, or Blackberry Enterprise Service, provides users with many applications and features, such as smart phone technology and seamless migration of users without requiring complicated input from the end-user. Knowing what ports to use is one of the most difficult steps in BES setup. Determine what port to use based on the item and connection type.
The built-in libraries for the Java programming language support advanced pattern-matching capabilities. Programs can define patterns consisting of one or more characters, then invoke the appropriate Java library functions to search for those patterns within a given string and to replace the occurrences found with different values. In particular, you can write Java code that represents a sentence as an instance of the built-in String Java class. You can then use library methods to count the number of occurrences of a given character within the sentence.
Scala is a general purpose programming language that is created to transform standard programming patterns in a precise, polished and type-safe manner. Java, on the other hand, is a programming language that runs the latest programs including business applications, games and utilities. Scala and Java can work in the same environment because both languages run on Java Virtual Machine (JVM). Since Java and Scala are fully compatible and interoperable with each other, either program can be used as a substitute for the other depending on the project requirements of the coder. Scala is not a superset of Java, but it…
Java is a powerful programming language that lets you create programs and applications that can perform almost any task. It is not always clear, however, how to get it to do certain things. For example, taking a screenshot with a Java program involves steps that are not obvious to the average Java developer. By using a couple of handy classes that can get information about the screen, namely Robot and Toolkit, you can do it fairly simply.
Apache ANT (Another Neat Tool) is a software utility that manages dependencies in complex Java applications. ANT allows the developer/builder to compile, assemble, test and run Java code consisting of multiple class files, libraries, test cases and data files spread over multiple directories. A user invokes ANT while specifying a "target" (defined, in turn, in ANT's "build.xml" file). In particular, the result of that invocation can be that "java" is called on a bytecode file -- that is, to instruct the Java Virtual Machine to run a body of compiled Java code.
Java provides ways for programmers to develop and customize a Graphic User Interface (GUI). You can utilize different layouts to organize the components of a GUI, approaches to customize the dimensions of components -- such as buttons and text boxes -- and methods to allow customization of the colors that are displayed in a GUI. The "Color" class in Java provides a built-in way to change and display the colors of GUI components.
In the Java programming language, source files created by programmers need to be compiled into an intermediate ("bytecode") representation before being executable on the Java Virtual Machine. Projects with multiple source files often have dependencies: a class should be recompiled not only whenever its own source files change, but also whenever the sources of other classes used in the code change. Dependencies can reach multiple levels. The "make" tool allows you to enforce dependencies on your Java project and to automatically recompile exactly what needs to be recompiled.
You can make any file executable from the command line in Linux. Even shell scripts written directly into a text editor can act as an executable file, as long as the system knows that the file can be executed. In Windows, the system knows a file is executable by its file extension -- for example, a binary application always has the ".exe" extension. However, Linux relies on file permissions to know if a file should be executed by the system.
Linux was first conceived as an operating system at a time when the only people interested in such things were computer programmers and entrepreneurs. As such, one of the important utilities bundled with the Linux system is a set of text editors, many of which are not based on an intuitive graphical interface. Rather than just one text editor, Linux and Linux-like operating systems (such as Mac OS and various types of UNIX) come equipped with multiple standard text editors ready out of the box and often accessible from the terminal command line.
The JavaMail Application Program Interface (API) was created as a standard extension for composing, sending and reading electronic messages, or emails. It works similarly to other mail programs, such as Eudora, Microsoft Outlook and Pine, in that it can be used to create Mail User Agent (MUA) type applications. JavaMail is not a Mail Transfer Agent such as Sendmail, so it does not really handle the delivery of the messages, but it does allow users to interact with MUA-type applications to retrieve and compose emails.
Breaking a string into parts is one of the basics of string operations. It is critical to more complex tasks like parsing data, which is used in decision-making processes. High-level programming languages, such as Ruby, Python, and Java all come with built-in string support and methods. Without knowing how to divide long strings, it's impossible to perform many more complex programming tasks.
The Java programming language provides several basic data types. Data types allow you to store data of a specific type, such as data of the number, letter or object type. If you need to create a custom type, you can use an enumeration. An enumeration allows you to specify all the possible elements of a custom type. For example, you can create an enumeration for the months of the year. This provides considerable flexibility in program development.
Java is an object-oriented programming language. A principle feature of object-oriented programming is encapsulation. Encapsulating a data member hides it behind an interface. Data stays hidden from all objects that attempt to interface with it. The encapsulating interface determines exactly how objects can affect the hidden data. A good way to practice object-oriented Java programming is to write a quick program that hides a data member and also provides a public interface that allows access to the data.
The Java programming language has many text processing features. You can use these features to write small applications that manipulate text. This is very handy for automating certain tedious tasks. For example, you can use Java to replace all the carriage return characters with space keystrokes. This will flatten a document into a single line, which may be useful under certain circumstances. Writing a program in Java that does this is a lot easier than manually replacing the carriage returns with spaces.
The American Standard Code for Information Interchange (ASCII) is a system for encoding the English alphabet for use in computers. Every letter in the English alphabet, both upper and lower case, have an equivalent ASCII code. You can use the Java programming language to reveal the ASCII code of a character. This can be useful if you have to convert from one encoding standard to another. The conversion process is very simple and only takes a single operation to perform.
The Java programming language comes with a large library of tools called classes. You can use these classes to perform many common programming tasks quickly and efficiently. For example, you can compare the contents of two strings using the class methods "length" and "charAt." If two strings are identical, they will have the same length and every character at each index in the string will be the same. This simple test can confirm whether or not two strings are identical.
The Java programming language has advanced text manipulation features. Java stores text data in a data type known as a string. A string can hold a series of numbers, letters, and symbols. You can convert a string into a number using a built-in method called "parseInt," which converts a string data type into an "int" data type. This is a very handy operation that can save you a lot of development time, especially when you are programming applications that deal with input of mixed types.
The Java programming language stores text data in a data type known as a string. Java has many built-in functions for manipulating strings. A very useful string manipulation function is split. Split chops up a string into many sub-strings and stores the result in an array of strings. You can set a special delimiter string that tells the split function where to cut the string. This kind of string manipulation is very handy when you have one large string and want to split it into more manageable chunks.
Java, like most programming languages, is capable of working with variables known as arrays, which contain a series of bytes. A byte is an eight digit binary number, made up of 1s and 0s arranged in any of 256 combinations. While byte arrays have many uses, one possible means of employing them is in conversion to string variables. A string is made up of a series of letters, and since each ASCII letter is 1 byte long, converting from byte to string requires little work.
The Java programming language has several built-in functions that allow you to perform many types of standard programming tasks with ease. For example, you can use the Date object to read the current time and use a StringBuilder to transform it into a string of text. This is very useful for placing time-date stamps on data, such as in log files. You can create a Date object and convert it into a string with a few lines of Java code.
A Java application can easily require many files to execute. You have one bytecode ".class" file for each object class defined by the application, plus configuration and data files needed by the executable code. The Java Archive tool, included in the standard Java tool set, allows you to pack all those files into a single archive file. An application packaged as an archive file is much easier, and less error-prone, to distribute and install than a collection of separate files and folders.
Writing a simple program to calculate profit is a common exercise for novice Java programmers. If completed successfully, the program will demonstrate knowledge of correct variable initialization, mathematical equations and programming logic. Simple programs give novice programmers practice debugging their code.
An Internet Protocol (IP) address consists of a sequence of four numbers, each of which is between 0 and 255. Computer networks use IP addresses to identify individual computers connected to the network, and to denote certain sets of connected computers (e.g., a local area network). The Java programming language has a built-in class to store and manipulate IP addresses. You can easily convert a human-readable String object denoting an IP address into the Java representation of that IP address.
Java programming provides two broad ways to use booleans. The primitive type boolean is the main element you are likely to use in your Java programs, but the Boolean class also provides you with the ability to use Booleans as objects rather than primitive types or values. The most common use for booleans in Java is within conditional testing, in which a program carries out a test with further processing dependent on the results. Using booleans in Java is generally easy and is a good initial technique to equip yourself with.
In all operating systems where the Java programming language can run, each file has a "size" attribute. The value of that attribute is the number of bytes occupied by the current contents of the file in question. You can read the size of a file from your Java program, by calling the length() method in the File library class.
When you program in Java, creating your own custom methods is one of the main activities. When you define a method, you declare various details about it, including its name, the data types of any parameters it takes and what data type it returns. Creating a method to return a Boolean value is one of the most straightforward instances. Even if you are just starting out with Java programming, you can write such a method quickly and easily.
Programs pass information using two different techniques: pass by reference and pass by value. Pass by value means that data is copied from the source to the destination. There are now two identical copies of the same data. Pass by reference means that only an alias to the data is copied from the source to the destination, giving both the source and destination access to the same copy of the data. In Java, everything is passed by value, but you can use the AtomicReference class to get behavior similar to pass by reference.
A Web application archive (WAR) is a package of compiled Java classes (that is, bytecodes for the Java Virtual Machine) plus Web resources such as images and HTML files for static Web pages. The free software development kit used by Sun Microsystems to distribute Java Enterprise Edition already contains the Packager tool, which you can use to build a WAR package.
The Java programming language has an extensive library for dealing with strings. A string is a chunk of text that is treated as a single entity by the software. Java makes searching and replacing characters in strings. This is very powerful because it can speed up long and tedious manual string editing. You can learn the basics of replacing multiple characters in a string in a few minutes and then apply what you learn to automating large tasks.
Computer programs have many different storage mechanisms for data. Because all computer data is sequences of 1s and 0s, the data storage mechanism defines what that data means. For example, the Java language can store a sequence of bits as a number, a string of text and more. Converting from one data type to another is occasionally necessary. For example, you may be printing text to the console and want to convert all your numbers to strings. You can do this in just a few lines of code using Java.
The class is the unit used to build all applications in the Java programming language. Different classes, or sets of classes, are generally stored on separate computer files. That allows for more modular program structures -- with the consequent benefits of maintainability and reusability -- and for the use of class libraries across many applications. A Java program can use classes defined in other files by "importing" them into its context.
Strings are the name of a data type that programming languages use to store text. A string can be a single word or an entire page of text, but they are usually about one line long, since that length improves source code readability. In the Java programming language, the String class contains all the features necessary to use strings in your program. The String class is part of the "java.lang" library. You can import the String class using the Import command.
Students of programming are often given interesting and educational challenges, such as removing all the punctuation in a string of text. This particular task requires the knowledge of string handling for a particular language. The Java language has robust string-handling facilities that make a task like this fairly simple, but also informative if you are new to Java. You can remove the punctuation from a string in Java with just a few lines of code.
Computer software often performs complex mathematics during the course of program execution. Most programming languages have mathematics libraries built into them, and Java is no exception. The Java "math" class contains many methods that allow you to perform basic arithmetic, trigonometry, exponential, and logarithmic operations. It also allows you to find the absolute value of a number. The absolute value is the magnitude of a number, irrespective of its sign. It can be thought of as the distance between a number and zero. You can find absolute values using the Java abs() feature.
Java provides multiple methods for storing text. In programming parlance, a single discrete sequence of text is called a "string." The American Standard Code for Information Interchange is a widely used method of encoding text for electronic devices. ASCII encodes 128 different characters, including all the letters in the English alphabet. Each letter has a corresponding ASCII code. You can convert a string of text in Java to the ASCII code using the built-in Java cast function.
C++ is the popular programming language that offers a host of features, including object-oriented programming. Input and output streams in C++ allow a user to obtain and provide data from and to the program. The standard input device in C++ is a keyboard, while the standard output is the computer screen. C++ also supports reading from any external file that is necessary to work with a large amount of data. Use the special C++ library "ifstream" to implement reading from a file.
Java added the "assert" keyword to make it easier to detect and report errors in Java 1.4. Assertions allow the program to specify a condition that it expects to be true. Should the condition fail, the program reports an error that must be handled.
Spyware Doctor is a program that protects your computer from spyware activity by creating a wall of protections around your data and scanning your computer memory and computer for any programs that have embedded themselves into your hard drive. Sometimes you need to apply a patch to your Spyware Doctor -- either to update the abilities of the software or to alter what it can do. Make sure you have the patch that corresponds to your version of the program, and you're good to go.
A Java application consists of a set of compiled class files, each with the CLASS file name extension. A user needs all class files in order to execute the application; most operating systems require that the user explicitly invoke the Java Virtual Machine on the main class. You can eliminate this problem by creating a single, executable Java archive (JAR) file that contains all required classes.
Java is an object-oriented computer programming language. Java programs, typically stored in files with names ending with the ".java" extension, get translated into bytecode files, with the ".class" file name extension, by the Java compiler. To execute a Java application, users have to invoke the Java Virtual Machine on a set of bytecode files. You can encapsulate all files required to run an application into a single, executable file -- thus making the application easier to deploy and invoke.
In the Java programming language, a single application can be structured as a set of classes. Normally, each class is compiled by the Java Compiler into a separate byte code file with the ".class" file name extension, and you need to distribute all class files in order to distribute the application. Moreover, a class file is not executable; you need to know which class contains the "main" method and explicitly open that class with the Java Virtual Machine. You can eliminate those problems by creating a single, executable file that contains all code and data needed by the application.
Ant Wars, an animated computer game by Anarchy Enterprises, lets a player manage an ant colony and attempt to take over the yard. The company offers an online demo version, but for the complete game you will have to purchase the offline version (it costs $6.99 as of March 2011). To prove your purchase, you have to enter your Product ID number and personal registration code.
Programs and applications used in Windows operating systems can contain programming and software errors that affect software stability and lead to crashes or freezes. Microsoft software engineers have provisioned the ability for programs and applications to be updated and modified using MSP files. MSP files determine if software needs to be updated and performs the task of patching the software to correct programming errors in Windows Installer applications. Common uses for MSP files are Windows security updates, but any Windows Installer application can take advantage of patch updates via MSP files.
The Rocket Java compiler lets you create programs that run on any operating system. Before releasing a Java application, you must troubleshoot issues, such as the "Error 2" compiler error returned.
RegCure is a Windows registry cleaner from Pareto Logic. Like a lot of other software, RegCure can be downloaded for free and requires a license code to activate it. You must enter this code into the interface and submit it while the program is open. And, in the same way you would to activate it, you must remove a RegCure license code through the interface, regardless of the reason. Reasons for removing a RegCure license code might include unregistering the software or adding a different license code.
The 2003 edition of the Microsoft Excel spreadsheet utility has an additional tool called "Visual Basic for Applications" (VBA), which is used to change your spreadsheets directly through Visual Basic code. VBA uses pre-defined routines called "methods" to perform different procedures. If you have a large spreadsheet filled with information, you may want to quickly locate specific data without manually looking through each cell. The VBA "Find" method lets you automatically search through the spreadsheet and locate a cell containing the data.
Visual Basic (VB) is an event-driven programming language and integrated development environment used to create graphical user interface applications, ActiveX controls and objects. If you attempt to open a portable document file (PDF) in VB, you will receive an error message. VB was not designed to be compatible with PDF files. You can install the VB PDF plug-in if you wish to open and get data from a PDF file in VB.
The Google Web Toolkit (or GWT) is a Java-based toolkit you can use to build a wide variety of Web applications and websites. GWT Designer is the component that will allow you to design a website easily using drag-and-drop tools and is available for download from the Google Code homepage. This plug-in is compatible with Eclipse, which is the code base and framework used to power GWT components.
The Web page you see in your browser does not show you everything on the page. Behind the scenes, your browser constantly loads content that contains cryptic HTML code. This code consists of "tags" such as "<p>." That tag tells the browser to display a paragraph on the Web page. Using C#, Microsoft's development language that works with Visual Studio, you can convert any site's HTML to text and remove those tags.
Creating a simple program that can locate the city for a given zip code requires first building a database of all the Zip codes in America and their corresponding cities, and then building the program that can load that database. The U.S. Postal Service sells an exhaustive database of this information as part of its Address Information Service. However, if finding the biggest city associated with a zip code is all you need to do, the U.S. Census provides a simple Comma Separated Value (CSV) database for free. Our program will be built in Microsoft Visual Basic .NET because its…
Having the knowledge on how to create a project to send email using Visual Basic for Applications (VBA) can save you time when you need to automate sending email. VBA is a computer programming language that can be used in Microsoft Office Excel to automate routine tasks such as sending email. Programmers often find the need to send more than one email to multiple email addresses and Excel can be used to accomplish this task.
Having the knowledge on how to compact a Microsoft Office Access database using Microsoft Visual Basic.NET, or VB.NET, can save you time when you need to continuously compact a database. Access is a relational database management system used to design small local databases. VB.NET is a computer programming language used to create Windows applications. You can save hard disk space by compacting a database. In a few steps you can create a VB.NET project and compact a local Access database.
Adobe created the Flex framework to provide a tool that programmers and Web developers can use to create interactive and graphical Web applications. The Flex framework provides built-in capabilities that allow Web developers to give an application the ability to interact with users. One such available interaction gives users the chance to upload a file to a Flex application. Web developers can limit the upload file types to file extensions commonly used for image files.
WAR files contain archives of web applications that are condensed into a single file. Build a Java application from a WAR file using the Java application called Another Neat Tool (ANT). ANT has the ability to automatically load your program's code from a WAR file and then compile it into an application.
A combo-box control is a control that is combination of a text box and a list box. It allows the user to select values from the drop down list or enter a new value. Often programmers run into the need to remove duplicate values from a combo-box control, and knowing how to remove them quickly can save you time. Microsoft Visual Basic.NET (VB.NET) is a computer programming language used to create Windows applications that can use combo boxes.
Most email providers like Gmail, HotMail and the like provide POP or IMAP access to your mailbox so you can download messages to an email client like Microsoft Outlook. Do this from your Java-based program with the help of the JavaMail API. You'll also use the Eclipse for Java Developers IDE to make accessing the libraries easier, though if you are comfortable using the Java Development Kit (JDK), you don't have to use an IDE.
Developing in Java involves the use of many tools, some of which are transparent to the developer, while others are less so. The only tools essential to most development are the Java runtime environment and the Java compiler. Other tools, such as text editors that automatically indent and error check source code, make development of Java programs faster.
Text processing is a common operation for programming languages, so you have a wide variety of choices for which programming language to use for embedding text into strings. Java, Python and Ruby are covered in this tutorial, though the steps will be similar in nearly any modern programming language.
Java is software that allows you to talk to people in chat rooms, play games online that support Java such as Yahoo! Games, listen to music, view and display graphics on web pages in 3D, and more. According to Java developers, Java is used in more than 4.5 billion electronic devices around the world. Some of these devices include cellular phones, global positioning systems (GPS), printers and medical equipment. Java is the programming language used to make all of these devices run, and was created in 1995 by Sun Microsystems.
Java's system for keeping track of dates is wrapped around a "Date" class, which keeps track of the current time zone and the number of milliseconds that have passed since a standard time, called the "epoch." In addition to this class, there is also a SimpleDateFormat class designed to make it easier to work with dates in forms understandable to humans.
Java servlet applications allow you to create software that runs on any operating system. Java programming is not compiled until it is executed on the machine, which makes it compatible with a wide range of operating systems. One function you can perform using Java code is the search of files on a user's machine. This is beneficial when you want to create an application that finds files relative to search criteria set by the user or your own software.
The BufferedInputStream is a class in the Java Input/Output (IO) library designed to allow a programmer to read data from an InputStream, such as from a file, from an Internet connection, from a microphone, or directly from the user's keyboard. In addition, it maintains its own copy of read data so that the programmer may use the \"Mark\" and \"Reset\" methods to bookmark a location in the stream and return to it later. It can be used either by itself or in conjunction with helper classes like the DataInputStream that make it simpler to read directly to common datatypes like…
The CertificateFactory class in Java's Cryptography Architecture exists to make it easier for programmers to load security certificates from certificate files stored on the hard drive. It provides a unified interface that can be extended to deal with a large number of certificates. Only \"X.509\" certificates are supported by default, however. The certificate factory cannot actually generate the certificate files themselves.
The Switch-Case statement common to most programming languages provides an easier and more readable way to handle decisions when there are a wide variety of possible options than the equivalent code using "if then else" statements. For example, instead of typing something like this: if (x = 1) then // Do something else if (x = 2) then // Do something else else if (x = 3) then // Do something else. You can type one of these case statements.
Java is a software development tool used to make Web, desktop and mobile applications. Databases are the central component for dynamic content, so Java supports connecting to the common database solutions. Java is capable of connecting to Oracle, MySQL and SQL Server databases. The Java language connects using the JDBC driver available in the Java library.
You can send an SMS text message to any phone using a Java program. It'll help if you have some experience with the Java programming language. You'll also need to know the wireless carrier of your recipient. Our plan of action is this: we will exploit that most wireless carriers allows access to their SMTP (Simple Mail Transfer Protocol) addresses. Then all that has to be done is use Java to send an email message to the right address--namely, something like YourTenDigitNumber@YourCarriersSMTP.com. The "SMTP Email Addresses" link in the Resources section contains a comprehensive list of SMTP's for nearly every…
If you are a frequent Java developer, chances are good that you will run into the need to create PDF documents dynamically. Java lets you do this using an external library, called iText. Once the iText library is installed and configured, you can add PdfWriter objects to your Java code that create pdf files quickly and easily. The Eclipse Java IDE will also be needed to edit, run, and test your Java code, as well as make the installation of iText easier.
Java is a powerful and versatile language that can be used to develop a variety of applications, including websites. This guide will cover the basic steps involved in building a website using servlets written in Java 6 on the Apache Tomcat 6 web server. While a website may be built on Tomcat using only Java Server Pages (JSP), this guide is limited to building a simple "Hello, World" servlet.
The Java programming language can be used to develop complex applications involving databases, sounds and video. But, it can also be used to develop simple games, including word puzzles. A good way to learn how to make a game in Java is to copy, compile and run an existing one, such as the one that follows.
Java Server Pages (JSPs) are designed to run from a Web server and give Java programmers the ability to dynamically create Web pages in response to client or other computer requests. JSPs use implicit objects, which are available to be requested via a JSP Container on each dynamically generated Web page through a Java Servlet or Java Bean. Implicit objects can be accessed as predefined variables by the programmer via script in a Servlet. The objects provide information that you may find useful for Web page display modifications, such as providing table properties, cookies stored on a clients computer from…
The Java programming language was developed in the mid-1990s by Sun Microsystems. Java programs can run on any operating system that supports the programming language through the use of a common Java Virtual Machine that is installed via the Java Plug-in. The Java Input Output library defines the abstract File Filter class that can be implemented to screen or filter file types. A common use of the File Filter is using an instance of the class in a JFileChooser for program user interfaces.
Java Web Start is an application "helper" deployed by Sun Microsystems with the Java Runtime environment. It is designed to help application developers deploy software written in Java that do the following: one-click activation of software applications, validation of software and Java versions being used for the program, and eliminates the need to upgrade Java or application versions over the life of the program. Java Web Start has been bundled with the Java Runtime Environment (JRE) since the JRE 5.0 version. Java Web Start reduces a number of problems that were previously experienced by consumers attempting to run client-side Java…
Prolog is a logic programming language--the name is short for "Programming Logic." The language isn't really meant be used to write word processors and web apps, like the majority of other programming languages, but rather in applications where advanced logic is required--particularly the fields of artificial intelligence and computational linguistics. Though Prolog, being so unlike other languages, is more difficult to learn than most, many online resources are available to help you, and you can, in fact, teach yourself.
Java developers have been able to send and receive email using the available Java libraries for a number of years. In order to keep up with technology that customers expect Enterprise solutions to provide, it has become necessary to use Java programming to send SMS text messages. Many customers expect to be able to receive SMS messages on their mobile phone for application updates and warnings since not all users have access to email on their cellular phone. SMS text messages may be sent from Java applications using the Java Mail and Communications libraries.
The Java printstream class works with files to retrieve information and output the results to the user. The unique aspect about printstream for output text is that it does not throw an exception if an error occurs. If the output fails, an internal compiler error is logged, but the user does not see any exception. Using the printstream class only takes a few lines of code in Java.
Most Java programmers at some point will need to turn to Java decompiler. Java decompilers provide a number of services for programmers. They can recover or reconstruct lost source code, display source codes during debugging, and analyze byte code. If you are using Java decompiler for noncommercial use, free versions of the software are available on the Internet.
Reading HTML files in Java is no different than reading text files. Unless the format of the file is XML, reading an HTML file is accomplished with a Java file object. The object imports the text from the file and reads it line-by-line. You can then use the text for manipulation, or you can output the text to the screen. Using the file object in Java to read files is accomplished with a few lines of code.
Generating random numbers in C is needed in several applications. For instance, generating a default password for a new user on a network uses random generation of numbers and letters. Random numbers are generated in gaming applications for character battles and fighting. Whatever the reason, generating the numbers is possible through an internal C function.
Converting an integer to a string is a common practice when programming. For some application processes, it's necessary to manipulate the format. Java makes converting an integer to a string easy through one of its internal functions.
When you need to offer a user many files as a download, a ZIP file is a natural way to do so. All modern operating systems handle ZIP files easily, and users know what to expect from them. In some cases, though, you may not be able to zip the files ahead of time, such as if you intend to include a license file with the archive. When this happens, don't worry, as PHP allows you to easily create ZIP archives programmatically and then offer them to the user.
Sometimes when you're just starting out programming and you just can't figure out how to make Java do exactly what you want it to, what you really need to do is check the Java API Documentation. You can search through all the classes and methods in the Java library, and I'm going to show you exactly how to do it.
Eclipse, a software development environment used by programmers, may not start if you don't specify the correct Java Virtual Machine. If you see an error message such as “VM terminated. Exit code=13 /usr/bin/java,” then you are probably trying to launch Eclipse with the wrong version of JVM. The troubleshooting steps described in this tutorial apply to computers running Lunix, which is the operating system preferred by most Java developers. The same principles apply to Windows, except that forward slashes must be changed to back slashes when specifying the path to the Java Virtual Machine.
Java has a number of assignment operators, or statements which adjust the value of a variable. Besides the simple assignment and initialization operator, there are a number of shorthand arithmetic operators to reduce repetition.
The logical operators introduce the concept of boolean algebra to the Java language. They're a fundamental part of the language and can make conditional code cleaner and more concise. Programmers usually use logical operators in conjunction with statements which will evaluate either true or false.
The heapsort algorithm is one of the fastest sorting algorithms available. Programmers use heapsort in Java because it's a good choice for very large arrays they know to be in an unsorted state. For efficiency's sake, an actual tree structure isn't used. Instead, the tree is formed in place, right in the array. The heapsort algorithm is an "in place" algorithm, as it requires no extra memory to perform the sort.
A skew heap is an abstract data structure. Though Java doesn't provide for a binary tree class, the skew heap can be thought of as a self-organizing binary search tree. The Java Skew Heap class implements the Comparable interface so lists of SkewHeap objects can be sorted easily.