import java.io.*;
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//多线程编程
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public class MultiThread
{
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public static void main(String args[])
{
System.out.println("我是主线程!");
// 下面创建线程实例thread1
ThreadUseExtends thread1 = new ThreadUseExtends();
// 创建thread2时以实现了Runnable接口的THhreadUseRunnable类实例为参数
Thread thread2 = new Thread(new ThreadUseRunnable(), "SecondThread");
thread1.start();// 启动线程thread1使之处于就绪状态
// thread1.setPriority(6);//设置thread1的优先级为6
// 优先级将决定cpu空出时,处于就绪状态的线程谁先占领cpu开始运行
// 优先级范围1到10,MIN_PRIORITY,MAX_PRIORITY,NORM_PAIORITY
// 新线程继承创建她的父线程优先级,父线程通常有普通优先级即5NORM_PRIORITY
System.out.println("主线程将挂起7秒!");
![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
try
{
Thread.sleep(7000);// 主线程挂起7秒
![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
} catch (InterruptedException e)
{
return;
}
System.out.println("又回到了主线程!");
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if (thread1.isAlive())
{
thread1.stop();// 如果thread1还存在则杀掉他
System.out.println("thread1休眠过长,主线程杀掉了thread1!");
} else
System.out.println("主线程没发现thread1,thread1已醒顺序执行结束了!");
thread2.start();// 启动thread2
System.out.println("主线程又将挂起7秒!");
![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
try
{
Thread.sleep(7000);// 主线程挂起7秒
![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
} catch (InterruptedException e)
{
return;
}
System.out.println("又回到了主线程!");
![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
if (thread2.isAlive())
{
thread2.stop();// 如果thread2还存在则杀掉他
System.out.println("thread2休眠过长,主线程杀掉了thread2!");
} else
System.out.println("主线程没发现thread2,thread2已醒顺序执行结束了!");
System.out.println("程序结束按任意键继续!");
![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
try
{
System.in.read();
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} catch (IOException e)
{
System.out.println(e.toString());
}
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}// main
}// MultiThread
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class ThreadUseExtends extends Thread
// 通过继承Thread类,并实现它的抽象方法run()
// 适当时候创建这一Thread子类的实例来实现多线程机制
// 一个线程启动后(也即进入就绪状态)一旦获得CPU将自动调用它的run()方法
![](/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](/Images/OutliningIndicators/ContractedBlock.gif)
{
![](/Images/OutliningIndicators/InBlock.gif)
![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
ThreadUseExtends()
{
}// 构造函数
![](/Images/OutliningIndicators/InBlock.gif)
![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
public void run()
{
System.out.println("我是Thread子类的线程实例!");
System.out.println("我将挂起10秒!");
System.out.println("回到主线程,请稍等,刚才主线程挂起可能还没醒过来!");
![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
try
{
sleep(10000);// 挂起5秒
![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
} catch (InterruptedException e)
{
return;
}
// 如果该run()方法顺序执行完了,线程将自动结束,而不会被主线程杀掉
// 但如果休眠时间过长,则线程还存活,可能被stop()杀掉
}
}
![](/Images/OutliningIndicators/None.gif)
class ThreadUseRunnable implements Runnable
// 通过实现Runnable接口中的run()方法,再以这个实现了run()方法的类
// 为参数创建Thread的线程实例
![](/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](/Images/OutliningIndicators/ContractedBlock.gif)
{
// Thread thread2=new Thread(this);
// 以这个实现了Runnable接口中run()方法的类为参数创建Thread类的线程实例
![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
ThreadUseRunnable()
{
}// 构造函数
![](/Images/OutliningIndicators/InBlock.gif)
![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
public void run()
{
System.out.println("我是Thread类的线程实例并以实现了Runnable接口的类为参数!");
System.out.println("我将挂起1秒!");
System.out.println("回到主线程,请稍等 jn0-120 e20-040 ,刚才主线程挂起可能还没醒过来!");
![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
try
{
Thread.sleep(1000);// 挂起5秒
![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
} catch (InterruptedException e)
{
return;
}
// 如果该run()方法顺序执行完了,线程将自动结束,而不会被主线程杀掉
// 但如果休眠时间过长,则线程还存活,可能被stop()杀掉
}
![](/Images/OutliningIndicators/InBlock.gif)
}
// 该程序可做的修改如改休眠时间或优先级setPriority()
posted @
2008-02-29 10:18
wj-conquer
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