Check out example codes for "java identifiers". It will help you in understanding the concepts better.

Code Example 1

// Identifiers : Name of a class, interface, method, variable.
public class Test
{
    public static void main(String[] args)
    {
        int a = 20;
    }
}
// Test : class name.
// main : method name.
// String : predefined class name.
// args : variable name.
// a :  variable name.

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