LinkedList getFirst()方法 (LinkedList getFirst() 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 return the first or initial or beginning element of the linked list. 此方法用于返回链表的第一个，初始或开始元素。

Syntax:

句法：

Object getFirst(){

}

Parameter(s):

参数：

In this method, we don’t pass any object as a parameter in the method but it returns the first object from the linked list.

在此方法中，我们不会在该方法中传递任何对象作为参数，但是它将返回链表中的第一个对象。

Return value:

返回值：

The return type of this method is not void that means this method returns object or element (i.e. It returns the only first element in the list).

此方法的返回类型不是void，这意味着此方法返回对象或元素(即，它返回列表中唯一的第一个元素)。

If the list is empty then it gives exception NoSuchElementException.

如果列表为空，则给出异常NoSuchElementException 。

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

//  Return first element from the list

System.out.println("The First Element From The List is:" + list.getFirst());

}

}

Output

输出量

D:\Programs>javac LinkList.java

D:\Programs>java LinkList

The Current list is:[10, 20, 30, 40, 50]

The First Element From The List is: 10

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