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MThread.java

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public class MThread

{

public static void main(String[] args)

{

System.out.println("Hello World!");

thread2 t1 = new thread2("线程实例1");

t1.start(); //调用

thread2 t2 = new thread2("线程实例2");

t2.start();

thread2 t3 = new thread2("线程实例3");

t3.start();

}

}

// 自定义线程类

class thread2 extends Thread

{

Thread thread; // 定义线程实例

String str;

// 构造函数

public thread2(String str)

{

this.str = str;

}

// 启动线程

public void start()

{

thread = new Thread(this);

thread.start();

}

public void run()

{

int i = 0;

while(thread != null)

{

try {

// 计数到5时睡眠10秒

if (i == 5)

sleep(10000);

}

catch (Exception e)

{

System.out.println(e.getMessage());

}

System.out.println(str);

i++;

}

}

}