Java多线程之线程并发库的线程池

应用示例如下：

 

package javaplay.thread.test;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;

public class ThreadPoolTest {
	public static void main(String[] args) {
		// 线程数是固定的
		ExecutorService threadPool = Executors.newFixedThreadPool(3);
		// 线程数是动态变化的
		// ExecutorService threadPool = Executors.newCachedThreadPool();
		// 如何实现线程死掉后重新启动(这句话本身就有问题，只能说找个替补)
		// ExecutorService threadPool = Executors.newSingleThreadExecutor();
		for (int i = 0; i < 10; i++) {
			final int task = i;
			threadPool.execute(new Runnable() {

				@Override
				public void run() {
					for (int j = 0; j < 10; j++) {
						try {
							Thread.sleep(100);
						} catch (InterruptedException e) {
							e.printStackTrace();
						}
						System.out.println(Thread.currentThread().getName() + " is looping of " + j + " for task of " + task);
					}
				}

			});
		}
		threadPool.shutdown();// 任务干完再结束
		// threadPool.shutdownNow();// 任务没干完也要结束
		System.out.println("all of 10 tasks have committed!");
		// threadPool.submit();

		// schedule不能指定一个固定的date时开始调度，可以date.getTime()-System.currentTimeMilis()
		// 详见doc
		Executors.newScheduledThreadPool(3).schedule(new Runnable() {

			@Override
			public void run() {
				System.out.println("bombing!");

			}

		}, 10, TimeUnit.SECONDS);
		Executors.newScheduledThreadPool(3).scheduleAtFixedRate(new Runnable() {

			@Override
			public void run() {
				System.out.println("bombing!!");

			}

		}, 6, 2, TimeUnit.SECONDS);
	}
}