LinkedList公共布尔布尔offerFirst(Object o)方法 (LinkedList public boolean offerFirst(Object o) method)

• This method is available in package java.util.LinkedList.offerFirst(Object o).

  软件包java.util.LinkedList.offerFirst(Object o)中提供了此方法。

• This method is used to add a specified object at the front of the linked list.

  此方法用于在链接列表的开头添加指定的对象。

Syntax:

句法：

    public boolean offerFirst(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 front element 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最前面。

Return value:

返回值：

The return type of this method is boolean that means this method returns true after execution.

该方法的返回类型为布尔值 ，这意味着该方法在执行后返回true。

Java程序演示LinkedList offerFirst(Object o)方法的示例 (Java program to demonstrate example of LinkedList offerFirst(Object o) 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);
// Add new element at the front of the 
// linked list using offerFirst(Object o)
list.offerFirst(60);
//  New list Output 
System.out.println("The new List is:" + list);
}
}

Output

输出量

D:\Programs>javac LinkList.java
D:\Programs>java LinkList
The Current list is:[10, 20, 30, 40, 50]
The new List is:[60, 10, 20, 30, 40, 50]

翻译自: https://www.includehelp.com/java/linkedlist-public-boolean-offerfirst-object-o-method-with-example.aspx