Parent.java

public class Parent {
    public int x = 0;

    public Parent(int x) { this.x = x; }

    public class InnerChild extends Parent {
        public int x = 1;

        public InnerChild(int x) {
            super(2 * x);
            this.x = x;
        }

        public void innerMethod(int x)
        {
            outerMethod(x);
            System.out.println(x);
            System.out.println(this.x);
            System.out.println(super.x);
            System.out.println(Parent.this.x);
        }
    }

    public void outerMethod(int x)
    {
        System.out.println(x);
        System.out.println(this.x);
    }

    public static void main(String [] args)
    {
        int x = 37;
        Parent p = new Parent(x);
        x = 6;
        Parent c1 = p.new InnerChild(x + 1);
        InnerChild c2 = p.new InnerChild(x - 1);

        p.outerMethod(2);
        c1.outerMethod(3);
        c2.innerMethod(4);
    }
}