java.lang.Object.wait(long timeout) 導致當前線程等待，直到其他線程調用此對象的 notify() 方法或notifyAll()方法，或在指定已經過去的時間。

當前線程必須擁有該對象的監視器。

聲明

以下是java.lang.Object.wait()方法的聲明

public final void wait(long timeout)

參數

• timeout -- 最大等待時間(毫秒)。

返回值

這個方法冇有返回值。

異常

• IllegalArgumentException --如果超時的值是負的。

• IllegalMonitorStateException -- 如果當前線程不是對象監視器的擁有者。

• InterruptedException -- 如果另一個線程中斷了當前線程。當這種異常被拋出當前線程的中斷狀態被清除。

例子

下麵的例子顯示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:'" + element + "'");

         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) {
      }
   }
}

讓我們來編譯和運行上麵的程序，這將產生以下結果：

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