callback method in java

Callback method chestnut: The manager wants you to do something before going on a business trip. This thing is told to you through doSomething. If the thing is done, she will be notified through phoneCall. Here's the phoneCall, we call it a callback method. It
satisfies the two basics of callback. Conditions:
1.ClassA calls the X method in ClassB 2.The X method in ClassB
calls the Y method in ClassA during the execution process to complete the callback

//该类用来模拟经理类
public class Manager {

    public Manager(Personel personel) {
        personel.doSomething(this, "整理公司文件");

    }

    // 当员工做完经理让他做的事后就通过该方法通知事情结果
    public void phoneCall(String result) {
        System.out.println("事情" + result);
    }
}

//该类用来模拟员工类
public class Personel {

    public void doSomething(Manager manager,String task) {
        //总经理通过doSomething方法告诉员工要做什么
        System.out.println("经理要你做"+task);

        String result="搞定了";

        //当事情做完了我们就通过经理公布的phoneCall方法通知结果
        manager.phoneCall(result);
    }

}

public class Test{

    public static void main(String[] args) {
        //首先需要一个员工
        Personel personel=new Personel();
        //其次把这个员工指派给经理
        new Manager(personel);
    }

}

Console:
经理要你做整理公司文件
事情搞定了