[Java] 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);
  }
 
}

now time is fri apr 15 22:31:53 cst 2016
now time is fri apr 15 22:32:03 cst 2016
now time is fri apr 15 22:32:13 cst 2016

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();
  }
 
}

任务:1是张三完成
任务:2是张三完成
任务:3是张三完成
任务:4是张三完成
任务:5是张三完成