从头认识java-18.2 基本的线程机制（3）-线程的返回与sleep

这一章节我们来讨论一下线程的返回与sleep。

1.线程的返回

package com.ray.ch17;

import java.util.Random;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;

public class Test {

	public static void main(String[] args) throws InterruptedException,
			ExecutionException {
		ExecutorService executors = Executors.newFixedThreadPool(2);
		Callable<Integer> callable = new MyCall();
		for (int i = 0; i < 10; i++) {
			Future<Integer> future = executors.submit(callable);
			System.out.println(future.get());
		}
	}
}

class MyCall implements Callable<Integer> {

	@Override
	public Integer call() throws Exception {
		System.out.println("doing something...");
		Thread.sleep(1000);
		return new Random().nextInt(50);
	}
}

输出：

doing something...
34
doing something...
2
doing something...
10
doing something...
11
doing something...
10
doing something...
28
doing something...
21
doing something...
29
doing something...
25
doing something...
0

上面的其实之前的一篇文章：从头认识java-17.6 Callable、Future和FutureTask里面所说的内容。

 

2.sleep

如果大家运行上面的代码，就会明显的感觉到每输出一遍，都会有停顿，这个就是sleep的作用。

 

总结：这一章节主要说明了线程的返回与sleep。

 

这一章节就到这里，谢谢。

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