Java LinkedList addFirst（）方法与示例

LinkedList addFirst()方法 (LinkedList addFirst() method)

• This method is available in package java.util.LinkedList.

  软件包java.util.LinkedList中提供了此方法。

• This method is used to insert an object at the initial or beginning stage of the linked list.

  此方法用于在链接列表的初始或开始阶段插入对象。

Syntax:

句法：

void addFirst(Object o){}

Parameter(s):

参数：

We can pass only one object as a parameter in the method and that object will add at the beginning of the linked list.

我们只能在方法中传递一个对象作为参数，并且该对象将添加到链接列表的开头。

Return value:

返回值：

The return type of this method is void that means this method returns nothing.

此方法的返回类型为void ，表示此方法不返回任何内容。

Java程序演示LinkedList addFirst()方法的示例 (Java program to demonstrate example of LinkedList addFirst() 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 OutputSystem.out.println("The Current list is:" + list);// Add new elements at the beginning list.addFirst(5);list.addFirst(3);// New list Output System.out.println("The new List is:" + list);} }

Output

输出量

D:\Programs>javac LinkList.javaD:\Programs>java LinkList The Current list is:[10, 20, 30, 40, 50] The new List is:[3, 5, 10, 20, 30, 40, 50]

翻译自: https://www.includehelp.com/java/linkedlist-addfirst-method-with-example.aspx

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