线程中wait跟notify的一个小例子

线程中wait和notify的一个小例子
今天看了一个关于sleep的面试题，然后自己想了一个关于wait的 具体实现是这样的
有三个buton 分别是hello stop wake 实现的功能是 当点击hello就在控制台输出一个hello 然后点击stop 输出hello就wait指导再点击wake然后中间点了几次hello就一下输出几个hello下面是我写的 但是写不对，线程这东西好久不用都忘了，希望各位指点一下。

Java code

import java.awt.FlowLayout;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.JButton;import javax.swing.JFrame;public class WaitNotifyTest extends JFrame {    private JButton sayHello;    private JButton stop;    private JButton wake;    private boolean flag;    public static void main(String[] args) {        new WaitNotifyTest().launch();    }    public void launch() {        sayHello = new JButton("hello");        stop = new JButton("stop");        wake = new JButton("wake");        flag = true;        add(sayHello);        add(stop);        add(wake);        sayHello.addActionListener(new ActionListener() {            @Override            public void actionPerformed(ActionEvent arg0) {                while (flag == false) {                    synchronized (this) {                        try {                            this.wait();                        } catch (InterruptedException e) {                            e.printStackTrace();                        }                    }                }                System.out.println("hello");            }        });        stop.addActionListener(new ActionListener() {            @Override            public void actionPerformed(ActionEvent arg0) {                flag = false;            }        });        wake.addActionListener(new ActionListener() {            @Override            public void actionPerformed(ActionEvent arg0) {                synchronized (this) {                    flag = true;                    this.notify();                }            }        });        this.setLayout(new FlowLayout());        this.pack();        this.setVisible(true);    }}

Java code

import java.awt.FlowLayout;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.JButton;import javax.swing.JFrame;public class WaitNotifyTest extends JFrame {    private JButton sayHello;    private JButton stop;    private JButton wake;    private boolean flag;    static Object ob=new Object();                    //用于做同步对象锁。    public static void main(String[] args) {        new WaitNotifyTest().launch();    }    public void launch() {        sayHello = new JButton("hello");        stop = new JButton("stop");        wake = new JButton("wake");        flag = true;        add(sayHello);        add(stop);        add(wake);        sayHello.addActionListener(new ActionListener() {            @Override            public void actionPerformed(ActionEvent arg0) {        new Thread(new Runnable(){                //内部类再创建并启动一个线程        public void run(){                while (flag == false) {                    synchronized (WaitNotifyTest.ob) {                        try {                            WaitNotifyTest.ob.wait();            //不用this了.             } catch (InterruptedException e) {                            e.printStackTrace();                        }                    }                }                System.out.println("hello");            }            }).start();        }        });        stop.addActionListener(new ActionListener() {            @Override            public void actionPerformed(ActionEvent arg0) {                flag = false;            }        });        wake.addActionListener(new ActionListener() {            @Override            public void actionPerformed(ActionEvent arg0) {                synchronized (WaitNotifyTest.ob) {        //这的同步对象也变了。                    flag = true;                    WaitNotifyTest.ob.notify();                }            }        });        this.setLayout(new FlowLayout());        this.pack();        this.setVisible(true);    }} 
 
[解决办法]
2 楼正解
[解决办法]

import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;

public class WaitNotifyTest extends JFrame {
   private JButton sayHello;
   private JButton stop;
   private JButton wake;
   private boolean flag;

   public static void main(String[] args) {
     WaitNotifyTest t=  new WaitNotifyTest();//改哈这里 this不要乱用  由于直接new出来的东西没有引用，不是实体不能被引用
    
     t.launch(); //楼主接分吧
   }

   public void launch() {
       sayHello = new JButton("hello");
       stop = new JButton("stop");
       wake = new JButton("wake");
       flag = true;
       add(sayHello);
       add(stop);
       add(wake);
       sayHello.addActionListener(new ActionListener() {
           @Override
           public void actionPerformed(ActionEvent arg0) {
               while (flag == false) {
                   synchronized (this) {
                       try {
                           this.wait();
                       } catch (InterruptedException e) {
                           e.printStackTrace();
                       }
                   }
               }
               System.out.println("hello");
           }
       });

       stop.addActionListener(new ActionListener() {
           @Override
           public void actionPerformed(ActionEvent arg0) {
               flag = false;
           }
       });

       wake.addActionListener(new ActionListener() {
           @Override
           public void actionPerformed(ActionEvent arg0) {
               synchronized (this) {
                   flag = true;
                   this.notify();
               }
           }
       });
       this.setLayout(new FlowLayout());
       this.pack();
       this.setVisible(true);
   }

}