package test;public class A extends B {        public String toString() {        return "A";    }    public static void main(String[] args) {        A a = new A();        a.say();                A.AIn aa = a.new AIn();        aa.bin();            }        class AIn extends BIn{            }}

package test;public class B {    public Thread thread;        public void say() {        //输出A        System.out.println(this.toString());        // 输入A，父类方法中使用真正子类对象用"父类.this"        System.out.println(B.this.toString());        say1(new I() {            public void II() {
   //匿名内部类的this                System.out.println(this);//B$1                System.out.println(B.this);//A//                System.out.println(A.this);  父类是访问不到子类A的,只能写B.    不能写B.A的属性，只能写B.B的属性，也就是给子类A对象赋值，因为访问不到A的任何东西                thread = Thread.currentThread();                B.this.thread = Thread.currentThread();            }        });    }    public String toString() {        return "B";    }    public void say1(I i) {        i.II();    }        class BIn{        public void bin() {            B.this.thread = Thread.currentThread();//            A.this.thread = Thread.currentThread();   父类是访问不到子类A的,只能写B.            System.out.println(B.this);//A        }    }}

package test;public interface I {    void II();}