java 并发编程之callable详解

Callable 线程并发实例：

package com.huange.thread.demo;

import java.util.concurrent.Callable;
import java.util.concurrent.FutureTask;

public class Demo {

	
	
	/**
	 * Callalbe和Runnable的区别
	 * 
	 * Runnable run方法是被线程调用的，在run方法是异步执行的
	 * 
	 * Callable的call方法，不是异步执行的，是由Future的run方法调用的
	 * 
	 * 
	 * 
	 * @param args
	 * @throws Exception
	 */
	public static void main(String[] args) throws Exception {

		Callable call = new Callable() {

			@Override
			public Integer call() throws Exception {
				System.out.println("正在计算结果...");
				Thread.sleep(3000);
				return 22;
			}
		};

		FutureTask task = new FutureTask<>(call);

		Thread thread = new Thread(task);
		thread.start();

		// do something
		System.out.println(" 干点别的...");

		Integer result = task.get();

		System.out.println("拿到的结果为：" + result);

	}

}