java.lang.Object.wait(long timeout)方法实例

java.lang.Object.wait(long timeout)%uA0导致当前线程等待，直到其他线程调用此对象的 notify() 方法或notifyAll()方法，或在指定已经过去的时间。

当前线程必须拥有该对象的监视器。

声明

以下是java.lang.Object.wait()方法的声明

public final void wait(long timeout)

参数

timeout%uA0--%uA0最大等待时间(毫秒)。

返回值

这个方法没有返回值。

异常

IllegalArgumentException%uA0--如果超时的值是负的。
IllegalMonitorStateException%uA0-- 如果当前线程不是对象监视器的拥有者。
InterruptedException%uA0-- 如果另一个线程中断了当前线程。当这种异常被抛出当前线程的中断状态被清除。

例子

下面的例子显示lang.Object.wait()方法的使用。

package com.yiibai

import java.util.Collections
import java.util.LinkedList
import java.util.List

public class ObjectDemo extends Object {

   private List synchedList

   public ObjectDemo() {
      // create a new synchronized list to be used
      synchedList = Collections.synchronizedList(new LinkedList())
   }

   // method used to remove an element from the list
   public String removeElement() throws InterruptedException {
      synchronized (synchedList) {

         // while the list is empty, wait up to 10 seconds
         while (synchedList.isEmpty()) {
            System.out.println("List is empty...")
            synchedList.wait(10000)
            System.out.println("Waiting...")
         }
         String element = (String) synchedList.remove(0)

         return element
      }
   }

   // method to add an element in the list
   public void addElement(String element) {
      System.out.println("Opening...")
      synchronized (synchedList) {

         // add an element and notify all that an element exists
         synchedList.add(element)
         System.out.println("New Element:&apos" + element + "&apos")

         synchedList.notifyAll()
         System.out.println("notifyAll called!")
      }
      System.out.println("Closing...")
   }

   public static void main(String[] args) {
      final ObjectDemo demo = new ObjectDemo()

      Runnable runA = new Runnable() {

         public void run() {
            try {
               String item = demo.removeElement()
               System.out.println("" + item)
            } catch (InterruptedException ix) {
               System.out.println("Interrupted Exception!")
            } catch (Exception x) {
               System.out.println("Exception thrown.")
            }
         }
      }

      Runnable runB = new Runnable() {

         // run adds an element in the list and starts the loop
         public void run() {
            demo.addElement("Hello!")
         }
      }

      try {
         Thread threadA1 = new Thread(runA, "A")
         threadA1.start()

         Thread.sleep(500)

         Thread threadA2 = new Thread(runA, "B")
         threadA2.start()

         Thread.sleep(500)

         Thread threadB = new Thread(runB, "C")
         threadB.start()

         Thread.sleep(1000)

         threadA1.interrupt()
         threadA2.interrupt()
      } catch (InterruptedException x) {
      }
   }
}

让我们来编译和运行上面的程序，这将产生以下结果：

List is empty...
List is empty...
Opening...
New Element:&aposHello!&apos
notifyAll called!
Closing...
Waiting...
Hello!
Waiting...
List is empty...
Interrupted Exception!

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声明

参数

返回值

异常

例子