Question

我有关于多线程编程的基本信息，所以我努力改进这个主题并运行调试模式，但它无法正常工作。

代码示例：

public class MultiThreadsExample implements Runnable {

private Thread t;
private String threadName;

//我有构造方法创建线程

public static void main(String[] args) {
    MultiThreadsExample thread1=new MultiThreadsExample("Thread-1");
    thread1.start();
    MultiThreadsExample thread2=new MultiThreadsExample("Thread-2");
    thread2.start();

}
//runnable interface override method
@Override
public void run() {
    System.out.println("Running thread name:" + threadName);
    for (int i = 0; i < 4; i++) {
        System.out.println("Working thread: " + i + " " + threadName);
        try {
            Thread.sleep(50);
        } catch (InterruptedException ex) {
            Logger.getLogger(MultiThreadsExample.class.getName()).log(Level.SEVERE, null, ex);
        }
    }
    System.out.println("Thread " + threadName + " interrupted.");
}

public void start() {
    System.out.println("Starting " + threadName);
    if (t == null) {
        t = new Thread(this, threadName);
        t.start();
    }
}

输出：

Creating thread name:Thread-1 Starting Thread-1 Creating thread name:Thread-2 Starting Thread-2 Running thread name:Thread-1 Working thread: 0 Thread-1 Working thread: 1 Thread-1 Working thread: 2 Thread-1 Working thread: 3 Thread-1 Thread Thread-1 interrupted. Running thread name:Thread-2 Working thread: 0 Thread-2 Working thread: 1 Thread-2 Working thread: 2 Thread-2 Working thread: 3 Thread-2 Thread Thread-2 interrupted.

Answer 1

从我的评论中我想，您希望得到如下输出： Working thread: 0 Thread-1 Working thread: 0 Thread-2 Working thread: 1 Thread-1 Working thread: 1 Thread-2 ... 这不是线程的工作方式。您无法控制完全执行线程的顺序。它取决于JVM，并且非常依赖于您的机器和操作系统之类的东西，因为您甚至可以调试IDE。因此，我可以告诉您的代码应该如此工作。

顺便说一下，当我运行你的代码时，这是输出，所以它可以在我的机器上运行： Creating thread name: Thread-1 Starting Thread-1 Creating thread name: Thread-2 Starting Thread-2 Running thread name:Thread-1 Running thread name:Thread-2 Working thread: 0 Thread-1 Working thread: 0 Thread-2 Working thread: 1 Thread-1 Working thread: 1 Thread-2 Working thread: 2 Thread-1 Working thread: 2 Thread-2 Working thread: 3 Thread-1 Working thread: 3 Thread-2 Thread Thread-1 interrupted. Thread Thread-2 interrupted.

你应该查看一些关于Java的并发性教程，如this one。他们解释了一些关于线程同步的基础知识。

为什么在处理多线程时调试不能正常工作

1 个答案: