Shadowing in Java

If a declaration of a member variable or a parameter name in a particular scope (such as an inner class or a method definition) has the same name as another declaration in the enclosing scope, then the declaration shadows the declaration of the enclosing scope. One cannot refer to a shadowed declaration by its name alone. The following example, ShadowTest, demonstrates this:

Sample Program


 
public class ShadowTest
{

    public int x = 0;

    class FirstLevel
    {

        public int x = 1;

        void methodInFirstLevel(int x)
        {
            System.out.println("x = " + x);
            System.out.println("this.x = " + this.x);
            System.out.println("ShadowTest.this.x = " + ShadowTest.this.x);
        }
    }

    public static void main(String... args)
    {
        ShadowTest st = new ShadowTest();
        ShadowTest.FirstLevel fl = st.new FirstLevel();
        fl.methodInFirstLevel(23);
    }
}
   

Output of the Program

Download Source code 'Hello World Program'

References : Oracle share on :        :  

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