java peek方法

ArrayDeque類peek()方法 (ArrayDeque Class peek() method)

• peek() Method is available in java.lang package.

  peek()方法在java.lang包中可用。

• peek() Method is used to return the head element of the queue denoted by this deque but without removing the element.

  peek()方法用于返回此雙端隊(duì)列表示的隊(duì)列的頭元素，但不刪除該元素。

• peek() Method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.

  peek()方法是一個(gè)非靜態(tài)方法，只能通過(guò)類對(duì)象訪問，如果嘗試使用類名稱訪問該方法，則會(huì)收到錯(cuò)誤消息。

• peek() Method does not throw an exception at the time retrieving the head element of this deque.

  peek()方法在檢索此雙端隊(duì)列的head元素時(shí)不會(huì)引發(fā)異常。

Syntax:

句法：

public T peek();

Parameter(s):

參數(shù)：

• It does not accept any parameter.

  它不接受任何參數(shù)。

Return value:

返回值：

The return type of the method is T, it returns the head element denoted by this deque otherwise it returns null when this deque is "blank".

方法的返回類型為T ，它返回此雙端隊(duì)列表示的head元素，否則當(dāng)此雙端隊(duì)列為“空白”時(shí)返回null。

Example:

例：

// Java program to demonstrate the example // of T peek() method of ArrayDeque import java.util.*;public class PeekOfArrayDeque {public static void main(String[] args) {// Creating an ArrayDeque with initial capacity of// storing elementsDeque < String > d_queue = new ArrayDeque < String > (10);// By using add() method to add elements// in ArrayDequed_queue.add("C");d_queue.add("C++");d_queue.add("Java");d_queue.add("Php");d_queue.add("DotNet");// Display Deque ElementsSystem.out.println("d_queue before peek(): ");System.out.println("ArrayDeque Elements = " + d_queue);System.out.println();// By using peek() method to return the// element at the first position in ArrayDequeString ele = d_queue.peek();// Display Returned ElementsSystem.out.println("d_queue.peek() : " + ele);} }

Output

輸出量

d_queue before peek(): ArrayDeque Elements = [C, C++, Java, Php, DotNet]d_queue.peek() : C

翻譯自: https://www.includehelp.com/java/arraydeque-peek-method-with-example.aspx

java peek方法

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