PriorityQueue類poll()方法 (PriorityQueue Class poll() method)

• poll() method is available in java.util package.

  poll()方法在java.util包中可用。

• poll() method is used to return the first element with removing an element from this PriorityQueue.

  poll()方法用于返回第一個元素，并從此PriorityQueue中刪除一個元素。

• poll() 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.

  poll()方法是一種非靜態方法，只能通過類對象訪問，如果嘗試使用類名稱訪問該方法，則會收到錯誤消息。

• poll() method does not throw an exception at the time of returning an element.

  poll()方法在返回元素時不會引發異常。

Syntax:

句法：

public Element poll();

Parameter(s):

參數：

• It does not accept any parameter.

  它不接受任何參數。

Return value:

返回值：

The return type of the method is Element, it returns the head element from this PriorityQueue when exists otherwise it returns null.

方法的返回類型為Element ，如果存在，它將從此PriorityQueue返回head元素，否則返回null。

Example:

例：

// Java program to demonstrate the example // of Element poll() method of // PriorityQueueimport java.util.*;public class PollOfPriorityQueue {public static void main(String args[]) {// Instantiate PriorityQueuePriorityQueue < String > pq = new PriorityQueue < String > ();// By using add() method is add// the given element into priority// queuepq.add("C");pq.add("C++");pq.add("JAVA");pq.add("PHP");pq.add("ANDROID");// Display PriorityQueueSystem.out.println("PriorityQueue: " + pq);// By using poll() method is to// return and remove the first element// from this PriorityQueueObject ele = pq.poll();// Display poll elementSystem.out.println("pq.poll(): " + ele);// Display PriorityQueueSystem.out.println("PriorityQueue: " + pq);} }

Output

輸出量

PriorityQueue: [ANDROID, C, JAVA, PHP, C++] pq.poll(): ANDROID PriorityQueue: [C, C++, JAVA, PHP]

翻譯自: https://www.includehelp.com/java/priorityqueue-poll-method-with-example.aspx

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