java for循环 多线程执行

在Java中，可以使用多线程来执行循环。以下是一个示例代码：

public class MultiThreadedLoop {
    public static void main(String[] args) {
        int numThreads = 4;
        int numIterations = 10;

        for (int i = 0; i < numThreads; i++) {
            int threadId = i;
            Thread thread = new Thread(() -> {
                for (int j = 0; j < numIterations; j++) {
                    System.out.println("Thread " + threadId + ": iteration " + j);
                }
            });
            thread.start();
        }
    }
}

在上面的代码中，我们创建了4个线程，并且每个线程都执行了10次循环。在每次循环中，线程打印出当前线程的ID和迭代次数。

运行上述代码，你将看到输出如下：

Thread 0: iteration 0
Thread 0: iteration 1
Thread 0: iteration 2
Thread 0: iteration 3
Thread 0: iteration 4
Thread 0: iteration 5
Thread 0: iteration 6
Thread 0: iteration 7
Thread 0: iteration 8
Thread 0: iteration 9
Thread 1: iteration 0
Thread 1: iteration 1
Thread 1: iteration 2
Thread 1: iteration 3
Thread 1: iteration 4
Thread 1: iteration 5
Thread 1: iteration 6
Thread 1: iteration 7
Thread 1: iteration 8
Thread 1: iteration 9
Thread 2: iteration 0
Thread 2: iteration 1
Thread 2: iteration 2
Thread 2: iteration 3
Thread 2: iteration 4
Thread 2: iteration 5
Thread 2: iteration 6
Thread 2: iteration 7
Thread 2: iteration 8
Thread 2: iteration 9
Thread 3: iteration 0
Thread 3: iteration 1
Thread 3: iteration 2
Thread 3: iteration 3
Thread 3: iteration 4
Thread 3: iteration 5
Thread 3: iteration 6
Thread 3: iteration 7
Thread 3: iteration 8
Thread 3: iteration 9

从输出中可以看到，4个线程并行执行了循环，每个线程打印了自己的ID和迭代次数。