java回调简单实现

package data;

import java.util.HashMap;
import java.util.Map;

public class Good  {
    CallBack callBack;

    public void setCallBack(CallBack callBack) {
        this.callBack=callBack;
    }
    
    private void doMyThing(){
        System.out.println("我做我自己的事情");
    }
    public void doSomeThing(){
        this.doMyThing();
        System.out.println("做完了我的事情");
        System.out.println("開始回调");
        this.callBack.show();
    }

    public static void main(String[] args) {
        Good good=new Good();
        good.setCallBack(new CallBack() {
            @Override
            void toDo(Map<String, String> map) {
                map.put("people", "哈哈");
                map.put("age", "100");
            }
        });
        good.doSomeThing();
    }
}

abstract class CallBack {
    Map<String, String> map = new HashMap<String, String>();
    
    public void show() {
        this.toDo(map);
        map.put("type", "人类");
        System.out.println(map);
    }

    abstract void toDo(Map<String, String> map);
}