線程池，在多線程開發考慮并發性能優化時都會考慮使用線程池。

1、示例

public class MyTask implements Runnable {	PRivate int taskNum;	public MyTask(int taskNum) {		this.taskNum = taskNum;	}	@Override	public void run() {		System.out.println("正在執行任務task:" + taskNum);		try {			Thread.currentThread().sleep(10);		} catch (InterruptedException e) {			e.printStackTrace();		}		System.out.println("task:" + taskNum + " 執行完畢！");	}}b)創建線程執行類Test.java
import java.util.concurrent.ThreadPoolExecutor;import java.util.concurrent.TimeUnit;import java.util.concurrent.ArrayBlockingQueue;public class Test {	public static void main(String[] args) {		ThreadPoolExecutor executor = new ThreadPoolExecutor(5, 10, 200, TimeUnit.MILLISECONDS,				new ArrayBlockingQueue<Runnable>(5));		for (int i = 0; i < 15; i++) {			MyTask mytask = new MyTask(i);			executor.execute(mytask);			System.out.println("線程池中的線程數目：" + "" + executor.getPoolSize() + ",隊列中等待執行的任務數目："					+ executor.getQueue().size() + ",已執行完成的任務數目：" + executor.getCompletedTaskCount());		}		/*		 * try { Thread.sleep(5000); } catch (InterruptedException e) {		 * e.printStackTrace(); }		 * 		 * System.out.print("--------:"+executor.getCompletedTaskCount());		 */		executor.shutdown();	}}
未完待續......