java 多线程统计质数,Java 七 多线程计算某个范围内的质数
Java 7 多線程計算某個范圍內的質數
不多說了,看代碼
通用類
package java7.concurrency.math;
/**
* This class generates prime numbers until is interrupted
*/
public class PrimeGenerator extends Thread{
private long numberRange;
public PrimeGenerator(long numberRange) {
this.numberRange = numberRange;
}
/**
* Central method of the class
*/
@Override
public void run() {
long number=2L;
// This bucle never ends... until is interrupted
while (true) {
if (isPrime(number)) {
System.out.printf("Number %d is Prime\n",number);
}
// When is interrupted, write a message and ends
if (isInterrupted()) {
System.out.printf("The Prime Generator has been Interrupted\n");
return;
}
if (number>=numberRange) {
return;
}
number++;
}
}
/**
* Method that calculate if a number is prime or not
* @param number : The number
* @return A boolean value. True if the number is prime, false if not.
*/
private boolean isPrime(long number) {
if (number <=2) {
return true;
}
for (long i=2; i
if ((number % i)==0) {
return false;
}
}
return true;
}
}
測試類
package java7.concurrency.basic;
import java.util.concurrent.TimeUnit;
import java7.concurrency.math.PrimeGenerator;
public class PrimeTest {
public static void main(String[] args) {
// Launch the prime numbers generator
Thread task=new PrimeGenerator(200);
task.start();
// Wait 1 seconds
try {
TimeUnit.SECONDS.sleep(1);
} catch (InterruptedException e) {
e.printStackTrace();
}
// Interrupt the prime number generator
task.interrupt();
}
}
總結
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