How to Get Macro Variables Into Java Variables

Java has a wide range of applications, but its programming versatility can be bolstered further with the incorporation of macro variables. These variables are convenient coding tools that use "symbolic substitution" -- where pre-coded symbols can stand in for text to which it is associated. This allows a program to respond automatically to certain data inputs. It also makes for greater efficiency, since they are coded to respond to changes in other parts of the code to keep a Java application cohesive and functional. Merging macro variables into Java variables is a relatively straightforward process.

Instructions

1. Open the Java code editor.

2. Set the assignment operator for a given variable. There are several different assignment operators in Java (for example, =, *=, /= and %=), each of which determine what the line of code is supposed to do with the information given.

3. Type the line of code:
   "import java.rmi.CreateException; import javax.ejb.MacroException;"

4. Input the following:

   "public void (String criminal, boolean) {UserTransaction tx = null;
   Connection con = null;
   try {
   // create a user transaction
   tx = sessionContext.getUserTransaction();
   tx.begin(); "

5. Copy the code for your macro variables into the Java code editor, following the code you input in step 4.

References

• "Effective Java"; Joshua Bloch; 2008