Java 利用线程池创造并发线程
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
public class ThreadPoolExecutorUtil {
// 池中所保存的线程数，包括空闲线程
private static final int corePoolSize = 10;
// 池中允许的最大线程数
private static final int maximumPoolSize = 100;
// 当线程数大于核心时，此为终止前多余的空闲线程等待新任务的最长时间(目前设为1800秒即30分钟)
private static final int keepAliveTime = 1800;
// 执行前用于保持任务的队列
private static final int blockingQueueSize = 10;
// 参数的时间单位
private static final TimeUnit unit = TimeUnit.SECONDS;
private static ThreadPoolExecutor threadPool = null;
/**
* 获取线程池的单例
* @return
*/
public static ThreadPoolExecutor getPoolInstance() {
if (threadPool == null) {
synchronized (ThreadPoolExecutor.class) {
// 实例化线程池
threadPool = new ThreadPoolExecutor(corePoolSize,
maximumPoolSize, keepAliveTime, unit,
new ArrayBlockingQueue<Runnable>(blockingQueueSize),
new ThreadPoolExecutor.DiscardOldestPolicy());
}
}
// 返程线程池的实例化对象
return threadPool;
}
public static void main(String[] args) {
for (int i = 0; i < 10; i++) {
// 实例化线程池
ThreadPoolExecutor threadPool = ThreadPoolExecutorUtil
.getPoolInstance();
// 触发并行线程的运行
threadPool.execute(new SingleThread(i+""));
}
}
}
class SingleThread implements Runnable {
private String name = null;
public SingleThread(String name) {
this.name = name;
}
public void run() {
System.out.println("parallel run..." + name);
}
}