java 方法 示例

ArrayDeque類pollFirst()方法 (ArrayDeque Class pollFirst() method)

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

  pollFirst()方法在java.lang包中可用。

• pollFirst() Method is used to return the first element of the queue denoted by this deque but with removing the first element from this deque.

  pollFirst()方法用于返回此雙端隊(duì)列表示的隊(duì)列的第一個(gè)元素，但會(huì)從此雙端隊(duì)列中刪除第一個(gè)元素。

• pollFirst() 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.

  pollFirst()方法是一種非靜態(tài)方法，只能通過(guò)類對(duì)象訪問(wèn)，如果嘗試使用類名稱訪問(wèn)該方法，則會(huì)收到錯(cuò)誤消息。

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

  pollFirst()方法在獲取此雙端隊(duì)列的元素時(shí)不會(huì)引發(fā)異常。

Syntax:

句法：

public T pollFirst();

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 first 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)列表示的第一個(gè)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 pollFirst() method of ArrayDeque import java.util.*;public class PollFirstOfArrayDeque {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 pollFirst(): ");System.out.println("ArrayDeque Elements = " + d_queue);System.out.println();// By using pollFirst() method to remove and return the// element at the first position in ArrayDequeString ele = d_queue.pollFirst();// Display Returned ElementsSystem.out.println("d_queue.pollFirst() : " + ele);System.out.println();// Display Deque ElementsSystem.out.println("d_queue after pollFirst(): ");System.out.println("ArrayDeque Elements = " + d_queue);} }

Output

輸出量

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

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

java 方法 示例

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