内部类的变量引用

 

内部类的变量引用

----inner&outer

class test
{
    public static void main(String[] args)
    {        
        A a = new A();
        A.B b = a.new B();
        A.B.C c = b.new C();
        A.B.C.D d = c.new D();
        d.print();
    }
}

class A
{
    private int index = 10;
    class B
    {
        private int index = 9;
            class C
            {
                private int index = 8;
                class D
                {
                    private int index = 7;
                    void print()
                    {
                        System.out.println(this.index);
                        System.out.println(D.this.index);
                        System.out.println(C.this.index);
                        System.out.println(B.this.index);
                        System.out.println(A.this.index);                        
                        System.out.println(A.B.this.index);

//这里总是打印this左边最近的类的变量，而this就是该类的引用。
                    }
                }
            }

    }
}