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); }}------解决方案--------------------------------------------------------
一个线程里，一旦进入wait()，线程进入阻塞，谁能唤醒？
修改了一下，楼主参考：
- 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); }}