How to Do Static Floats in Java
In the Java programming language, every variable needs to be explicitly declared as a member of a class. Java includes pre-defined classes for some common datatypes such as "Integer" and "Float" (a simple-precision floating-point number). If you apply the "static" modifier to a variable declaration, Java interprets that there is a single instance of that variable for the whole class, instead of the default interpretation (a separate instance for each existing object of that class). You can declare a float variable while using the "static" modifier.
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Instructions
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Declare a new class to house the static float variable, as in the following example:
public class Notch{
}
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Add declarations for all state variables that need to be replicated in every instance of the new class, as follows:
public class Notch{
private float displacement;
private String name;
}
By default, class variables are not static.
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Add the declaration for the static variable (one instance per class) as follows:
public class Notch{
private float displacement;
private String name;
private static float sumAllDisplacements = (float)0;
}
In this example, the static float variable will keep (when complemented by the appropriate class methods) the sum of the displacements of all Notch instances created so far.
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