public interface CallbackInterface {
  public boolean check(int result);
}

public class Manager implements CallbackInterface {

  private Programmer programmer = null;

  public Manager(Programmer _programmer) {
    this.programmer = _programmer;
  }

  /**
   * 用于 Boss 下达的委托
   */
  public void entrust() {
    arrange();
  }

  // 进行安排下属进行 study 工作
  private void arrange() {
    System.out.println("Manager 正在为 Programmer 安排工作");
    programmer.study(Manager.this);
    System.out.println("为 Programmer 安排工作已经完成，Manager 做其他的事情去了。");
  }

  @Override
  public boolean check(int result) {
    if (result == 5) {
      return true;
    }
    return false;
  }

}

public class Programmer {

  public void study(CallbackInterface callback) {
    int result = 0;
    do {
      result++;
      System.out.println("第 " + result + " 次研究的结果");
    } while (!callback.check(result));

    System.out.println("调研任务结束");
  }
}

public class Boss {

  public static void main(String[] args) {
    Manager manager = new Manager(new Programmer());
    manager.entrust();
  }
}

public class Programmer {

  public Programmer() {
  }

  public void study(CallbackInterface callback) {
    new StudyThread(callback).start();
  }

  // --------------------------- Programmer 正在做的工作 ---------------------------

  class StudyThread extends Thread {

    CallbackInterface callback = null;

    public StudyThread(CallbackInterface _callback) {
      callback = _callback;
    }

    @Override
    public void run() {
      int result = 0;
      do {
        result++;
        System.out.println("第 " + result + " 次研究的结果");
      } while (!callback.check(result));

      System.out.println("调研任务结束");
    }
  }
}

interface Incrementable {
  void increment();
}

class Callee1 implements Incrementable {

  private int i = 0;

  @Override
  public void increment() {
    i++;
    System.out.println(i);
  }

}

public class Callbacks {
  public static void main(String[] args) {
    Callee1 callee1 = new Callee1();
    callee1.increment();
  }
}

class Caller {

  private Incrementable callbackReference;

  public Caller(Incrementable _callbackReference) {
    callbackReference = _callbackReference;
  }

  void go() {
    callbackReference.increment();
  }
}

public class Callbacks {
  public static void main(String[] args) {
    Callee1 callee1 = new Callee1();    
    Caller caller1 = new Caller(callee1);
    caller1.go();
  }
}

class MyInCrement {

  public void increment() {
    System.out.println("MyCrement.increment");
  }

  static void f(MyInCrement increment) {
    increment.increment();
  }
}

class Callee2 extends MyInCrement {

  private int i = 0;

  public void increment() {
    super.increment();
    i++;
    System.out.println(i);
  }
}

class Callee2 extends MyInCrement {

  private int i = 0;

  public void increment() {
    super.increment();
    i++;
    System.out.println(i);
  }

  private class Closure implements Incrementable {

    @Override
    public void increment() {
      Callee2.this.increment();
    }
  }

  Incrementable getCallbackReference() {
    return new Closure();
  }
}

public class Callbacks {
  public static void main(String[] args) {    
    Callee2 callee2 = new Callee2();
    Caller caller2 = new Caller(callee2.getCallbackReference());
    caller2.go();
  }
}