每当对对象调用wait()方法时,它都会导致当前线程等待,直到另一个线程调用notify()或notifyAll( ) 该对象的方法,而 wait(long timeout) 导致当前线程等待,直到另一个线程调用 notify() 或 notifyAll( ) 该对象的方法,或者已过了指定的超时时间。
在下面的程序中,当 wait() 在对象上调用,线程从运行状态进入等待状态。它等待其他线程调用 notify() 或 notifyAll() 才能进入可运行状态,将会形成死锁。
class MyRunnable implements Runnable { public void run() { synchronized(this) { System.out.println("In run() method"); try { this.wait(); System.out.println("Thread in waiting state, waiting for some other threads on same object to call notify() or notifyAll()"); } catch (InterruptedException ie) { ie.printStackTrace(); } } } } public class WaitMethodWithoutParameterTest { public static void main(String[] args) { MyRunnable myRunnable = new MyRunnable(); Thread thread = new Thread(myRunnable, "Thread-1"); thread.start(); } }
In run() method
在下面的程序中,当对对象调用 wait(1000)时,线程从运行状态进入等待状态,即使在超时时间过后没有调用notify()或notifyAll()线程也会从等待状态进入可运行状态。
class MyRunnable implements Runnable { public void run() { synchronized(this) { System.out.println("In run() method"); try { <strong> this.wait(1000); </strong> System.out.println("Thread in waiting state, waiting for some other threads on same object to call notify() or notifyAll()"); } catch (InterruptedException ie) { ie.printStackTrace(); } } } } public class WaitMethodWithParameterTest { public static void main(String[] args) { MyRunnable myRunnable = new MyRunnable(); Thread thread = new Thread(myRunnable, "Thread-1"); thread.start(); } }
In run() method Thread in waiting state, waiting for some other threads on same object to call notify() or notifyAll()
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