如果您了解进程间通信,那么您将很容易理解线程间通信.当您开发一个两个或多个线程交换某些信息的应用程序时,Interthread通信很重要.
有三个简单的方法和一个小技巧可以使线程通信成为可能.所有这三种方法都列在下面 :
Sr.No. | 方法&说明 |
---|---|
1 | public void wait() 导致当前线程等到另一个线程调用notify(). |
2 | public void notify() 唤醒正在此对象监视器上等待的单个线程. |
3 | public void notifyAll() 唤醒在同一个对象上调用wait()的所有线程. |
这些方法已在Object中作为 final 方法实现,因此它们在所有类中都可用.所有三种方法只能在 synchronized 上下文中调用.
此示例显示了两个线程如何使用 wait()和 notify()方法进行通信.您可以使用相同的概念创建复杂的系统.
class Chat { boolean flag = false; public synchronized void Question(String msg) { if (flag) { try { wait(); } catch (InterruptedException e) { e.printStackTrace(); } } System.out.println(msg); flag = true; notify(); } public synchronized void Answer(String msg) { if (!flag) { try { wait(); } catch (InterruptedException e) { e.printStackTrace(); } } System.out.println(msg); flag = false; notify(); } } class T1 implements Runnable { Chat m; String[] s1 = { "Hi", "How are you ?", "I am also doing fine!" }; public T1(Chat m1) { this.m = m1; new Thread(this, "Question").start(); } public void run() { for (int i = 0; i < s1.length; i++) { m.Question(s1[i]); } } } class T2 implements Runnable { Chat m; String[] s2 = { "Hi", "I am good, what about you?", "Great!" }; public T2(Chat m2) { this.m = m2; new Thread(this, "Answer").start(); } public void run() { for (int i = 0; i < s2.length; i++) { m.Answer(s2[i]); } } } public class TestThread { public static void main(String[] args) { Chat m = new Chat(); new T1(m); new T2(m); } }
当上述程序被编译并执行时,它会产生以下结果 :
Hi Hi How are you ? I am good, what about you? I am also doing fine! Great!
以上示例已经采取,然后从[https://stackoverflow.com/questions/2170520/inter-thread-communication-in-java]修改