ExecutorCompletionService多线程处理(线程有返回结果)

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package com.thread;

import java.util.concurrent.Callable;
import java.util.concurrent.CompletionService;
import java.util.concurrent.ExecutorCompletionService;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

/**
 * 多线程执行有返回值的处理
 * @author Administrator
 *
 */
public class ThreadResultExecutor {
	/**
	 * @param args
	 */
	public static void main(String[] args) throws Exception {
		ExecutorService exec=Executors.newFixedThreadPool(50);
		CompletionService<String> serv = new ExecutorCompletionService<String>(exec);
		//模拟，一个对象tt，在多个线程中使用,是否会影响相互的值
			for (int i = 0; i < 50; i++) {
				serv.submit(new runTest<String>("aa"+i));
			}
			for (int i = 0; i < 50; i++) {
				serv.submit(new runTest<String>("bb"+i));
			}
			System.out.println("start");
//			for (int i = 0; i < 50; i++) {
//				try {
//					//serv.take();
//					System.out.println(serv.take().get());
//					//System.out.println(serv.take().get());
//				} catch (Exception e) {
//					e.printStackTrace();
//				}
//			}
	        exec.shutdown();//此方法等待处理完毕后再释放
			//System.exit(0);
	        
	}

}
class runTest<String> implements Callable<String>{
	private String tt;
	
	@Override
	public String call() throws Exception {
		Thread.currentThread().sleep(2000);
		System.out.println( tt+"="+Thread.currentThread().getId());
		return (String) (tt+"="+Thread.currentThread().getId());
	}
	public runTest(String tt){
		this.tt=tt;
		//ttt.set(tt);
	}
}