线程中yield()方法的一个奇怪的问题

最新推荐文章于 2025-05-12 21:50:28 发布

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本文通过一个简单的Java多线程示例测试了yield方法的效果。在循环中每到达10的倍数时调用一次yield方法，期望能实现线程间的轮流执行。然而，实际运行结果显示该方法并未如预期般工作。

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今天做了个关于yield方法的一个小例子测试，

一个线程循环50次，用变量i标记，并每次输出当前循环到第几次(输出i)，

当i为整10的数时调用yield方法(if(0 == i%10))

本以为一个这么小的例子应该不会出什么问题，结果。。。。

下面贴出源代码和4次测试结果

源代码:

public class TestYield {

	public static void main(String[] args) {
		Thread4 t1 = new Thread4("1");
		Thread4 t2 = new Thread4("2");
		t1.start();
		t2.start();
	}
}

class Thread4 extends Thread {
	public Thread4(String name) {
		super(name);
	}
	public void run() {
		for(int i=1; i<=50; i++) {
			System.out.println("thread "+getName()+":"+i);
			if(0 == i%10) {
				yield();
			}
		}
	}
}

结果1：

thread 1:1
thread 1:2
thread 1:3
thread 1:4
thread 1:5
thread 1:6
thread 1:7
thread 1:8
thread 1:9
thread 1:10
thread 2:1
thread 2:2
thread 2:3
thread 2:4
thread 2:5
thread 2:6
thread 2:7
thread 2:8
thread 2:9
thread 2:10
thread 1:11
thread 1:12
thread 2:11
thread 2:12
thread 2:13
thread 2:14
thread 2:15
thread 2:16
thread 2:17
thread 1:13
thread 1:14
thread 1:15
thread 1:16
thread 1:17
thread 1:18
thread 1:19
thread 1:20
thread 2:18
thread 2:19
thread 2:20//这里异常
thread 2:21
thread 2:22
thread 2:23
thread 2:24
thread 2:25
thread 2:26
thread 2:27
thread 2:28
thread 2:29
thread 2:30//这里异常
thread 2:31
thread 2:32
thread 1:21
thread 1:22
thread 1:23
thread 1:24
thread 1:25
thread 1:26
thread 1:27
thread 1:28
thread 1:29
thread 1:30//这里异常
thread 1:31
thread 1:32
thread 1:33
thread 1:34
thread 1:35
thread 1:36
thread 1:37
thread 1:38
thread 1:39
thread 1:40
thread 2:33
thread 2:34
thread 2:35
thread 2:36
thread 2:37
thread 2:38
thread 2:39
thread 2:40
thread 1:41
thread 1:42
thread 1:43
thread 2:41
thread 2:42
thread 2:43
thread 2:44
thread 2:45
thread 2:46
thread 2:47
thread 2:48
thread 2:49
thread 2:50
thread 1:44
thread 1:45
thread 1:46
thread 1:47
thread 1:48
thread 1:49
thread 1:50

结果2：

thread 1:1
thread 1:2
thread 1:3
thread 1:4
thread 2:1
thread 2:2
thread 2:3
thread 2:4
thread 2:5
thread 2:6
thread 2:7
thread 2:8
thread 2:9
thread 2:10
thread 1:5
thread 1:6
thread 1:7
thread 1:8
thread 1:9
thread 1:10
thread 2:11
thread 2:12
thread 2:13
thread 2:14
thread 2:15
thread 2:16
thread 2:17
thread 2:18
thread 2:19
thread 2:20//这里异常
thread 2:21
thread 2:22
thread 2:23
thread 2:24
thread 2:25
thread 2:26
thread 2:27
thread 2:28
thread 2:29
thread 2:30//这里异常
thread 2:31
thread 2:32
thread 2:33
thread 2:34
thread 2:35
thread 2:36
thread 2:37
thread 2:38
thread 2:39
thread 2:40//这里异常
thread 2:41
thread 2:42
thread 2:43
thread 2:44
thread 2:45
thread 2:46
thread 2:47
thread 2:48
thread 2:49
thread 2:50
thread 1:11
thread 1:12
thread 1:13
thread 1:14
thread 1:15
thread 1:16
thread 1:17
thread 1:18
thread 1:19
thread 1:20
thread 1:21
thread 1:22
thread 1:23
thread 1:24
thread 1:25
thread 1:26
thread 1:27
thread 1:28
thread 1:29
thread 1:30
thread 1:31
thread 1:32
thread 1:33
thread 1:34
thread 1:35
thread 1:36
thread 1:37
thread 1:38
thread 1:39
thread 1:40
thread 1:41
thread 1:42
thread 1:43
thread 1:44
thread 1:45
thread 1:46
thread 1:47
thread 1:48
thread 1:49
thread 1:50

结果3：

thread 1:1
thread 1:2
thread 1:3
thread 1:4
thread 1:5
thread 1:6
thread 1:7
thread 1:8
thread 1:9
thread 1:10//这里异常
thread 1:11
thread 1:12
thread 1:13
thread 1:14
thread 1:15
thread 1:16
thread 1:17
thread 1:18
thread 1:19
thread 1:20//这里异常
thread 1:21
thread 1:22
thread 1:23
thread 1:24
thread 1:25
thread 1:26
thread 1:27
thread 1:28
thread 1:29
thread 1:30//这里异常
thread 1:31
thread 2:1
thread 2:2
thread 2:3
thread 2:4
thread 2:5
thread 2:6
thread 2:7
thread 2:8
thread 2:9
thread 2:10
thread 1:32
thread 1:33
thread 1:34
thread 1:35
thread 1:36
thread 1:37
thread 1:38
thread 1:39
thread 1:40
thread 2:11
thread 2:12
thread 2:13
thread 2:14
thread 2:15
thread 2:16
thread 2:17
thread 2:18
thread 2:19
thread 2:20
thread 1:41
thread 1:42
thread 1:43
thread 1:44
thread 1:45
thread 1:46
thread 1:47
thread 1:48
thread 1:49
thread 1:50
thread 2:21
thread 2:22
thread 2:23
thread 2:24
thread 2:25
thread 2:26
thread 2:27
thread 2:28
thread 2:29
thread 2:30
thread 2:31
thread 2:32
thread 2:33
thread 2:34
thread 2:35
thread 2:36
thread 2:37
thread 2:38
thread 2:39
thread 2:40
thread 2:41
thread 2:42
thread 2:43
thread 2:44
thread 2:45
thread 2:46
thread 2:47
thread 2:48
thread 2:49
thread 2:50

结果4：

thread 1:1
thread 1:2
thread 1:3
thread 1:4
thread 1:5
thread 1:6
thread 1:7
thread 2:1
thread 2:2
thread 2:3
thread 2:4
thread 2:5
thread 2:6
thread 2:7
thread 2:8
thread 2:9
thread 2:10
thread 1:8
thread 1:9
thread 1:10
thread 2:11
thread 2:12
thread 2:13
thread 2:14
thread 2:15
thread 2:16
thread 2:17
thread 2:18
thread 2:19
thread 2:20//这里异常
thread 2:21
thread 2:22
thread 2:23
thread 2:24
thread 2:25
thread 2:26
thread 2:27
thread 1:11
thread 2:28
thread 2:29
thread 2:30
thread 1:12
thread 1:13
thread 1:14
thread 1:15
thread 1:16
thread 1:17
thread 1:18
thread 1:19
thread 1:20
thread 2:31
thread 2:32
thread 2:33
thread 2:34
thread 2:35
thread 2:36
thread 2:37
thread 2:38
thread 2:39
thread 2:40//这里异常
thread 2:41
thread 2:42
thread 2:43
thread 2:44
thread 2:45
thread 2:46
thread 2:47
thread 2:48
thread 2:49
thread 2:50
thread 1:21
thread 1:22
thread 1:23
thread 1:24
thread 1:25
thread 1:26
thread 1:27
thread 1:28
thread 1:29
thread 1:30
thread 1:31
thread 1:32
thread 1:33
thread 1:34
thread 1:35
thread 1:36
thread 1:37
thread 1:38
thread 1:39
thread 1:40
thread 1:41
thread 1:42
thread 1:43
thread 1:44
thread 1:45
thread 1:46
thread 1:47
thread 1:48
thread 1:49
thread 1:50

运行4次，每次都有异常

求解？