In Java, nested classes are categorized as either static member classes or inner classes. Inner classes are non-static member classes, local classes, or anonymous classes.

The compiler will report illegal forward reference when it encounters static int x = y;. This is because source code is compiled from the top down, and the compiler hasn’t yet seen y.

Example of static and final in Java Here's a static final example to further demonstrate the point. The following Account class has three properties: An accountId of type int marked as final. An ...