Java语言程序设计第八章节.ppt
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第8章 线程;本讲内容;线程的概念;Thread类简介;例8_1 在新线程中计算整数的阶乘;// class FactorialThread controls thread execution
class FactorialThread extends Thread {
private int num;
public FactorialThread( int num )
{ this.num=num; }
public void run()
{ int i=num;
int result=1;
while(i0)
{ result=result*i; i=i-1; }
System.out.println(The factorial of +num+
is +result);
System.out.println(new thread ends);
}
} ;运行结果如下：
main thread starts
new thread started,main thread ends
The factorial of 10 is 3628800
new thread ends
;例8_2 创建3个新线程，每个线程睡眠任意0-6秒钟，然后结束。;class TestThread extends Thread {
private int sleepTime;
public TestThread( String name )//构造函数
{ super( name ); //调用基类构造函数为线程命名
//获得随机休息毫秒数
sleepTime = ( int ) ( Math.random() * 6000 );
}
public void run() //线程启动并开始运行后要执行的方法
{ try {
System.out.println(
getName() + going to sleep for + sleepTime );
Thread.sleep( sleepTime ); //线程休眠
}
catch ( InterruptedException exception ) {};
//运行结束，给出提示信息
System.out.println( getName() + finished );
}
};运行结果为：
Starting threads
Threads started, main ends
thread1 going to sleep for 3519
thread2 going to sleep for 1689
thread3 going to sleep for 5565
thread2 finished
thread1 finished
thread3 finished;Runnable接口;例8_3 使用Runnable接口实现例8_1功能;// class FactorialThread controls thread execution
class FactorialThread implements Runnable
{ private int num;
public FactorialThread( int num )
{ this.num=num; }
public void run()
{ int i=num;
int result=1;
while(i0)
{ result=result*i; i=i-1; }
System.out.println(The factorial of +num+
is +result);
System.out.println(new thread ends);
}
} ;例8_4 使用Runnable接口实现例8_2功能;cl
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