java如何在方法内部重写Runnable？

Question

请就以下问题给我一个建议

我有甲级和甲级；B类 如何在类B中的方法foo中重写Runnable

class A {    
    //some code
    .......    
    protected void foo() {
        //some code
        .......         
        //adding click listener to instance of MyButton
        myButton.show(new Runnable(){
            @Override
            public void run() {
                .......
            }
        });         
        //some code
        .......
    }    
    //some code
    .......    
}

class B extends A {    
    @Override
    protected void foo() {
        super.foo();            
        //some NEW code
        .......         
        //adding click listener to instance of MyButton
        myButton.show(new Runnable(){
            @Override
            public void run() {
                //Copied&Pasted old code
                .......                 
                //NEW code
                .......
            }
        });
    }

}

我是否可以向按钮的处理程序添加新代码（在myButton中可运行），而不复制&；从super中粘贴现有代码？怎么做

Answer 1

如果要重用逻辑，必须使用命名类实例而不是匿名类实例

例如：

class A {
    ...
    static class ButtonLogic implements Runnable
    {
        public void run() {...}
    }

    protected void foo() {
        //adding click listener to instance of MyButton
        myButton.show(new A.ButtonLogic());
            .......
    }
}

然后B可以覆盖该逻辑：

class B extends A {

    @Override
    protected void foo() {
        super.foo();

        //some NEW code
        .......

        //adding click listener to instance of MyButton
        myButton.show(new A.ButtonLogic(){
            @Override
            public void run() {
                super.run();
                .......

                //NEW code
                .......
            }
        });


    }

}