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);
}