Java LinkedList公共对象peek()方法(带示例)
LinkedList公共對象peek()方法 (LinkedList public Object peek() method)
This method is available in package java.util.LinkedList.peek().
軟件包java.util.LinkedList.peek()中提供了此方法。
This method is used to retrieve the head element of the linked list without removing the head element.
此方法用于檢索鏈接列表的head元素,而無需刪除head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 peek(){}Parameter(s):
參數:
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,我們不會在該方法中傳遞任何對象作為參數,但是它將返回鏈表中的第一個對象。
Return value:
返回值:
The return type of this method is not void that means this method returns head object or element (i.e. It returns the only first 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頭對象或元素(即,它返回列表中唯一的第一個元素)。 如果列表為空,則不會給出任何異常。
Java程序演示LinkedList peek()方法的示例 (Java program to demonstrate example of LinkedList peek() 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);// Using peek() method it will retrieve first element // without removing the element from the list System.out.println("The First Element In The List is:" + list.peekFirst());} }Output
輸出量
D:\Programs>javac LinkList.javaD:\Programs>java LinkList The Current list is:[10, 20, 30, 40, 50] The First Element In The List is:10翻譯自: https://www.includehelp.com/java/linkedlist-public-object-peek-method-with-example.aspx
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