LinkedList公共對象pollLast()方法 (LinkedList public Object pollLast() method)

• This method is available in package java.util.LinkedList.pollLast().

  軟件包java.util.LinkedList.pollLast()中提供了此方法。

• This method is used to retrieves the last or ending element of the linked list and removes the last element from the list finally.

  此方法用于檢索鏈表的最后一個元素或結尾元素，最后從列表中刪除最后一個元素。

• If the list is empty then it will return null.

  如果列表為空，則它將返回null。

Syntax:

句法：

    public Object pollLast(){
}

Parameter(s):

參數：

In this method, we don’t pass any object as a parameter in the method but it returns the last object from the linked list and then remove the last element from the list.

在此方法中，我們不會在該方法中傳遞任何對象作為參數，但它會從鏈接列表中返回最后一個對象，然后從列表中刪除最后一個元素。

Return value:

返回值：

The return type of this method is not void that means this method returns last object or element (i.e. It returns only last element in the list). If the list is empty then it will not give any exception.

該方法的返回類型不是void，這意味著該方法返回最后一個對象或元素(即，它僅返回列表中的最后一個元素)。 如果列表為空，則不會給出任何異常。

Java程序演示LinkedList pollLast()方法的示例 (Java program to demonstrate example of LinkedList pollLast() method)

import java.util.LinkedList;
public class LinkList {
public static void main(String[] args) {
LinkedList list = new LinkedList();
// use add() method to add elements in the list 
list.add(10);
list.add(20);
list.add(30);
list.add(40);
list.add(50);
//  Current list Output
System.out.println("The Current list is:" + list);
//  Using pollLast() method it will retrieve last element 
// with removing the last element from the list  
System.out.println("The Last Element In The List is:" + list.pollLast());
//  Updated list Output after implementing pollLast()
System.out.println("The Updated List after implementing pollLast() The list is:" + list);
}
}

Output

輸出量

D:\Programs>javac LinkList.java
D:\Programs>java LinkList
The Current list is:[10, 20, 30, 40, 50]
The Last Element In The List is:50
The Updated List after implementing pollLast() The list is:[10, 20, 30, 40]

翻譯自: https://www.includehelp.com/java/linkedlist-public-object-polllast-method-with-example.aspx