求助。Java线程如何开始和暂停，详细点啊，菜鸟没学过

2012-12-27 05:33:47 489 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

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用了suspend()和resume()可以实现，但是这两个方法过时了。

用了wait()没效果，暂停不了。

不要用sleep，因为我向要点击两个按钮，一个是开始线程（也是继续线程），一个是暂停线程，

而且要求是对同一个线程进行开始和暂停，不要new 一个新的线程、

求助。

PS：我试wait()和interrupt()不行的。。。

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nmyangym 2012-12-31

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改了一下代码,楼主参考:(去掉有关demo2的注释，可看见两个线程的效果）


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

import javax.swing.*;

class Training extends JFrame implements Runnable, ActionListener
{
	public static JButton run;
	public static JButton exit;
	public static JButton stop;
	public static Thread demo;
	//public static Thread demo2;
	public static int i = 1,j=1;
	private boolean waitFlag=false;		//设置一标志，false暂停，true运行。
	//用到两个过时方法。还不知道怎么解决
	public void run() 
	{
		while(true)
		{
			System.out.println(""+Thread.currentThread().getName()+"  "+i++);
			try 
			{
				//demo.sleep(1000);
				Thread.sleep(1000);//静态方法。
			}
		       	catch (InterruptedException e) 
			{
				e.printStackTrace();
			}
			while(!waitFlag)
			{
				System.out.println(Thread.currentThread().getName()+ " is pausing!");
				pause();
				System.out.println(Thread.currentThread().getName()+" is continuing!");
			}
		}
	}

	public 	synchronized void pause()
	{
		try
		{
			wait();
		}
		catch(InterruptedException ie)
		{
			ie.printStackTrace();
		}
	}
	public synchronized void awake()
	{
		notifyAll();//用notify()只会唤醒一个等待线程
	}
	public static void main(String[] args) 
	{
		Training he = new Training();
		demo = new Thread(he, "线程_1");
		//demo2 = new Thread(he,"线程_2");
		demo.start();
		//demo2.start();

		JPanel jp = new JPanel();
		jp.setLayout(new FlowLayout(FlowLayout.CENTER));
		run = new JButton("运行");
		exit = new JButton("退出");
		stop = new JButton("暂停");
		
		run.addActionListener(he);
		exit.addActionListener(he);
		stop.addActionListener(he);

		jp.add(run);
		jp.add(stop);
		jp.add(exit);
		he.setLayout(new FlowLayout(FlowLayout.CENTER));
		he.add(jp);
		he.setLocation(300, 200);
		he.setSize(200, 100);
		he.setTitle("测试");
		he.setVisible(true);
	}

	public void actionPerformed(ActionEvent b) 
	{
		if (b.getSource() == run) 
		{
			//System.out.println("线程正在运行");
			waitFlag=true;
			awake();
			System.out.println("线程_1 的状态是 "+demo.getState());
			//System.out.println("线程_2 的状态是 "+demo2.getState());
		}
		else if (b.getSource() == stop) 
		{
			waitFlag=false;
			System.out.println("线程_1 的状态是 "+demo.getState());
			//System.out.println("线程_2 的状态是 "+demo2.getState());
		}
		else if (b.getSource() == exit) 
		{
			System.out.println("退出");
			System.out.println(demo.activeCount());
			System.exit(0);
			return;
		}
	}
}

a949812755 2012-12-28

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用wait()和notify()就这样了 Exception in thread "AWT-EventQueue-0" java.lang.IllegalMonitorStateException: current thread not owner at java.lang.Object.wait(Native Method) at java.lang.Object.wait(Unknown Source) at Training.actionPerformed(Training.java:86) at javax.swing.AbstractButton.fireActionPerformed(Unknown Source) at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source) at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source) at javax.swing.DefaultButtonModel.setPressed(Unknown Source) at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source) at java.awt.Component.processMouseEvent(Unknown Source) at javax.swing.JComponent.processMouseEvent(Unknown Source) at java.awt.Component.processEvent(Unknown Source) at java.awt.Container.processEvent(Unknown Source) at java.awt.Component.dispatchEventImpl(Unknown Source) at java.awt.Container.dispatchEventImpl(Unknown Source) at java.awt.Component.dispatchEvent(Unknown Source) at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source) at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source) at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source) at java.awt.Container.dispatchEventImpl(Unknown Source) at java.awt.Window.dispatchEventImpl(Unknown Source) at java.awt.Component.dispatchEvent(Unknown Source) at java.awt.EventQueue.dispatchEvent(Unknown Source) at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.run(Unknown Source)

a949812755 2012-12-28

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import java.awt.FlowLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.*; class Training extends JFrame implements Runnable, ActionListener { public static JButton run; public static JButton exit; public static JButton stop; public static Thread demo; public static int i = 1,j=1; //用到两个过时方法。还不知道怎么解决 public void run() { while(true){ System.out.println(i++); try { demo.sleep(1000); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } public static void main(String[] args) { Training he = new Training(); demo = new Thread(he, "线程"); // demo.start(); //demo.setDaemon(false); JPanel jp = new JPanel(); jp.setLayout(new FlowLayout(FlowLayout.CENTER)); run = new JButton("运行"); exit = new JButton("退出"); stop = new JButton("停止"); run.addActionListener(he); exit.addActionListener(he); stop.addActionListener(he); jp.add(run); jp.add(stop); jp.add(exit); he.setLayout(new FlowLayout(FlowLayout.CENTER)); he.add(jp); he.setLocation(300, 200); he.setSize(200, 100); he.setTitle("测试"); he.setVisible(true); } public void actionPerformed(ActionEvent b) { if (b.getSource() == run) { System.out.println("线程正在运行"); System.out.println(demo.getState().equals("BLOCKED")); if (j == 1) { demo.start(); j++; } return; } if (b.getSource() == exit) { System.out.println("退出"); System.out.println(demo.activeCount()); System.exit(0); return; } if (b.getSource() == stop) { // // try { // demo.wait(11111); // } catch (InterruptedException e) { // // TODO Auto-generated catch block // e.printStackTrace(); // } i = 1; System.out.println("线程停止"); return; } } }

eviljordan 2012-12-27

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为什么wait不行？你有notify吗。。最好最温柔的方式是用boolean来控制进程的结束。

失落夏天 2012-12-27

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http://blog.csdn.net/perjer123/article/details/7371389 看看这篇文章吧。真的很不错。以前我也是只会用，懂得并不深，看完这个之后收获很大。

public_lcc 2012-12-27

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用sleep怎么就不能用两个按钮了。。。在开始按钮上写一个判断，再加一个变量。。。不就行了

失落夏天 2012-12-27

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wait()怎么可能不管用呢。你把代码发上来。

求助。Java线程如何 开始和暂停，详细点啊 ，菜鸟没学过

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求助。Java线程如何开始和暂停，详细点啊，菜鸟没学过