Java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 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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