this关键字在继承中的使用

参考：http://blog.csdn.net/gxzzxj/article/details/51946144

下面是自己的代码：

public class ChildA extends Father {
    void add() {
        System.out.println("A中的ADD");
    }
}

public class ChildB extends Father {
    void add() {
        System.out.println("B中的ADD");
    }
}

import org.apache.catalina.filters.AddDefaultCharsetFilter;

public class Father {
    public Father() {
        System.out.println(this);
    }
    void add() {
        System.out.println("父类中的ADD");
    }
    
}

public class Main {
    public static void main(String[] args) {
        Father a = new ChildA();
        a.add();
    }
}

 参考博客的代码及结果

public class Father1 {
    private int a = 10;

    Father1() {
        System.out.println(this instanceof Son);
        System.out.println(this.a);
        System.out.println(((Son) this).a);
        System.out.println(this.getClass().getName());
    }

    public static void main(String[] args) {
    
        Father1 s = new Son();
        System.out.println(s.a);
    }
}

class Son extends Father1 {
    public int a = 0;
    public int b = 1;
    public Son() {
        //隐式调用super();
        super();
        System.out.println("Son类中执行："+this);
    }

}