第9章多线程与Applet

//例程9-1：Pi.java

/*演示采用多线程技术计算圆周率*/

public class Pi{

public static void main(String[] args){

PiCaculator pc = new PiCaculator();

Thread t = new Thread(pc);

t.start();

try{

Thread.sleep (10000); //休眠，等待可能出现的异常情况

t.interrupt ();

}catch(InterruptedException e){

e.printStackTrace();

}

}

}

class PiCaculator implements Runnable{

private double latestPiEstimate;

public void run(){

try{

System.out.print ("Math.PI = "+ Math.PI + "\t" );

calPi(0.00001);

System.out.println ("the latest PI = "+http://www.doczj.com/doc/c5af6d3410661ed9ad51f381.htmltestPiEstimate );

}catch(InterruptedException e){

System.out.println("The caculator is Interrupted.");

}

}

/**用于计算圆周率的方法，accuracy为计算精度*/

private void calPi(double accuracy) throws InterruptedException

{

http://www.doczj.com/doc/c5af6d3410661ed9ad51f381.htmltestPiEstimate =0.0;

long iteration = 0;

int sign = -1;

//按给定精度计算圆周率

while(Math.abs (http://www.doczj.com/doc/c5af6d3410661ed9ad51f381.htmltestPiEstimate)>accuracy){

if(Thread.interrupted ())

throw new InterruptedException();