用Java解释匿名类

Question

When the program is run display function gets called. But not able to understand how?

class A
{
    class B
    {
        void display()
        {
            System.out.println("display in B.....");
        }
    }
}

class Twenty extends A.B
{
    Twenty(A temp)
    {
       temp.super();
    }
    public static void main(String args[])
    {
        A obj=new A();
        Twenty abc=new Twenty(obj);
        abc.display();
    }
}

explain this program

Answer 1

This is as simple as a class Twenty extending a class B .

Since there is a method display in the B class, Twenty inherits this method as if this method is declared in it. This is why you are able to call the display method on an object of the class Twenty which is abc .

Answer 2

简单的继承，Twenty从它的构造函数调用“.super（）”，因为Twenty扩展A＆B然后调用方法“display（）”将给你这个结果

Answer 3

由于类Twenty从B类扩展，它可以访问其非私有方法。（简单）

Answer 4

你从B类扩展了Twenty类：class Twenty extends AB比你在Twenty实例上调用display（）所以调用了继承的显示方法。

Answer 5

You can access inner class method from an outer class. Here outer class is A and that is the object you are passing to constructor in your main method.Also, it obeys inheritance. Because of these two reasons, "display" method is getting invoked.