详解java 三种调用机制（同步、回调、异步）

import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Date;
/**
 *TimePrinter实现回调函数接口
 */
public class TimePrinter implements ActionListener {

  @Override
  public void actionPerformed(ActionEvent event) {
    // TODO Auto-generated method stub
    Date now=new Date();
    System.out.println("Now time is "+now);
    Toolkit.getDefaultToolkit().beep();
  }

}

import java.awt.event.ActionListener;
import javax.swing.JOptionPane;
import javax.swing.Timer;

public class TimerTest {

  public static void main(String[] args) {
    // TODO Auto-generated method stub
    ActionListener listener=new TimePrinter();
    Timer timer=new Timer(10000, listener);
    timer.start();
    JOptionPane.showMessageDialog(null, "quit");
    System.exit(0);
  }

}

public interface Callback {

  public void taskResult(String name);
}

/**
 * 学生必须指导老师的信息，才能回报任务情况，因此它必须实现回调接口
 *
 */
public class Teacher implements Callback{

  @Override
  public void taskResult(String name) {
    // TODO Auto-generated method stub
    System.out.println("任务:"+name+"完成");
  }

}

public class Student {
  Callback callback=null;
  //将老师的联系信息给学生
  public void setCallback(Callback callback)
  {
    this.callback=callback;
  }
   public void doTask()
   {
     for(int m=1;m<6;m++)
     {
       callback.taskResult(m+"是张三");
     }
   }
}

public class CallbackTest {

  public static void main(String[] args) {
    // TODO Auto-generated method stub
    Student student=new Student();
    student.setCallback(new Teacher());
    student.doTask();
  }

}