method and the// constructor that accepts an IEnumerable<T>.Queue<string> queueCopy =newQueue<string>(numbers.ToArray()); Console.WriteLine("\nContents of the first copy:");foreach(stringnumberinqueueCopy ) { Console.WriteLine(number); }// Create an array twice the size of the queue ...
This method is similar to theDequeuemethod, butPeekdoes not modify theQueue. nullcan be added to theQueueas a value. To distinguish between a null value and the end of theQueue, check theCountproperty or catch theInvalidOperationException, which is thrown when theQueueis empty. ...
程序1: 使用peek()方法返回 LinkedBlockingQueue 的头部,其中容量为 7 的 LinkedBlockingQueue 包含名称列表// Java Program Demonstrate peek() // method of LinkedBlockingQueue import java.util.concurrent.LinkedBlockingQueue; public class GFG { public static void main(String[] args) { // define ...
[Android.Runtime.Register("peek","()Ljava/lang/Object;","GetPeekHandler:Java.Util.IQueueInvoker, Mono.Android, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null")]publicJava.Lang.Object? Peek (); Returns Object the head of this queue, ornullif this queue is empty ...
Queue 中 element() 和 peek() 都是用来返回队列的头元素,不删除。 在队列元素为空的情况下,element() 方法会抛出NoSuchElementException异常,peek() 方法只会返回 null。 JDK1.8 中源码解释 /** * Retrieves, but does not remove, the head of this queue. This method ...
Returns without removing the first message in the queue. Peek(Int64) Returns without removing the first message in the queue. Peek() Returns without removing the first message in the queue. C# publicMicrosoft.ServiceBus.Messaging.BrokeredMessagePeek(); ...
IQueue.Peek Method Reference Feedback Definition Namespace: Java.Util Assembly: Mono.Android.dll Retrieves, but does not remove, the head of this queue, or returns null if this queue is empty. C# 複製 [Android.Runtime.Register("peek", "()Ljava/lang/Object;", "GetPeekHandler:Java...
queue is empty. The Peek()// method throws an exception if there is no message// in the queue. This method handles that exception// by returning true to the calling method.//***publicboolIsQueueEmpty(){boolisQueueEmpty =false;// Connect to a queue.MessageQueue myQueue =newMessageQueue...
queue is empty. The Peek()// method throws an exception if there is no message// in the queue. This method handles that exception// by returning true to the calling method.//***publicboolIsQueueEmpty(){boolisQueueEmpty =false;// Connect to a queue.MessageQueue myQueue =newMessageQueue...
* prevents it from being added to this queue * 添加元素,如果添加成功则返回true,如果队列是满的,则返回false */booleanoffer(Ee);/** * Retrieves and removes the head of this queue. This method differs * from {@link #poll poll} only in that it throws an exception if this ...