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  • 七. 多线程编程5.创建多线程

    到目前为止,我们仅用到两个线程:主线程和一个子线程。然而,你的程序可以创建所需的更多线程。例如,下面的程序创建了三个子线程:
    // Create multiple threads.
    class NewThread implements Runnable {
        String name; // name of thread
        Thread t;
        NewThread(String threadname) {
            name = threadname;
            t = new Thread(this, name);
            System.out.println("New thread: " + t);
            t.start(); // Start the thread
        }

        // This is the entry point for thread.
        public void run() {
            try {
                for(int i = 5; i > 0; i--) {
                   System.out.println(name + ": " + i);
                   Thread.sleep(1000);
                }
            } catch (InterruptedException e) {
                System.out.println(name + "Interrupted");
            }
            System.out.println(name + " exiting.");
        }
    }

    class MultiThreadDemo {
        public static void main(String args[]) {
            new NewThread("One"); // start threads www.xuancayule.com 
            new NewThread("Two");
            new NewThread("Three");
            try {
                // wait for other threads to end
                Thread.sleep(10000);
            } catch (InterruptedException e) {
                System.out.println("Main thread Interrupted");
            }
            System.out.println("Main thread exiting.");
        }
    }

    程序输出如下所示:
    New thread: Thread[One,5,main]
    New thread: Thread[Two,5,main]
    New thread: Thread[Three,5,main]
    One: 5
    Two: 5
    Three: 5
    One: 4
    Two: 4
    Three: 4
    One: 3
    Three: 3
    Two: 3
    One: 2
    Three: 2
    Two: 2
    One: 1
    Three: 1
    Two: 1
    One exiting.
    Two exiting.
    Three exiting.
    Main thread exiting.

    如你所见,一旦启动,所有三个子线程共享CPU。注意main()中对sleep(10000)的调用。这使主线程沉睡十秒确保它最后结束。

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  • 原文地址:https://www.cnblogs.com/ok932343846/p/6831879.html
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