Java LinkedList removeFirstOccurrence()用法及代码示例

java.util.LinkedList.removeFirstOccurrence()用于从列表中删除第一次出现的指定元素。如果没有出现指定的元素，则列表保持不变。

用法：

LinkedListObject.removeFirstOccurrence(Object element)

参数：该方法采用一个参数element ，该参数element 将从列表中删除。对象类型应与列表中的元素相同。

返回值：如果列表包含指定的元素并被删除，则该方法返回boolean True，否则返回false。

以下示例程序旨在说明removeFirstOccurrence()方法：
示例1:

// Java code to demonstrate removeFirstOccurrence() method 
import java.util.LinkedList; 
public class GfG { 
    // Main method 
    public static void main(String[] args) 
    { 
  
        // Creating a LinkedList objec 
        LinkedList<String> list = new LinkedList<String>(); 
  
        // Adding an element at the last 
        list.addLast("one"); 
  
        // Adding an element at the last 
        list.addLast("two"); 
  
        // Adding an element at the last 
        list.addLast("three"); 
  
        // Adding an element at the last 
        list.addLast("one"); 
  
        System.out.print("List before removing the "+ 
                   "first Occurrence of \"one\" : "); 
  
        // Printing the list 
        System.out.println(list); 
  
        // Removing first occurrence of one. 
        boolean returnValue = list.removeFirstOccurrence("one"); 
  
        // Printing the returned value 
        System.out.println("Returned Value : " + returnValue); 
  
        System.out.print("List after removing the"+ 
                            " first Occurrence of \"one\" : "); 
  
        // Printing the list 
        System.out.println(list); 
    } 
}

输出：

List before removing the first Occurrence of "one" : [one, two, three, one]
Returned Value : true
List after removing the first Occurrence of "one" : [two, three, one]

示例2:

// Java code to demonstrate removeFirstOccurrence method in LinkedList 
  
import java.util.LinkedList; 
  
public class GfG { 
    // Main method 
    public static void main(String[] args) 
    { 
  
        // Creating a LinkedList objec 
        LinkedList<Integer> list = new LinkedList<Integer>(); 
  
        // Adding an element at the last 
        list.addLast(10); 
  
        // Adding an element at the last 
        list.addLast(20); 
  
        // Adding an element at the last 
        list.addLast(30); 
  
        // Adding an element at the last 
        list.addLast(10); 
  
        System.out.print("List before removing the"+ 
                  " first Occurrence of \"10\" : "); 
  
        // Printing the list 
        System.out.println(list); 
  
        // Removing first occurrence of one. 
        boolean returnValue = list.removeFirstOccurrence(10); 
  
        // Printing the returned value 
        System.out.println("Returned Value : " + returnValue); 
  
        System.out.print("List after removing the"+ 
                           " first Occurrence of \"10\" : "); 
  
        // Printing the list 
        System.out.println(list); 
    } 
}

输出：

List before removing the first Occurrence of "10" : [10, 20, 30, 10]
Returned Value : true
List after removing the first Occurrence of "10" : [20, 30, 10]

相关用法

注：本文由纯净天空筛选整理自ShivamKD大神的英文原创作品 LinkedList removeFirstOccurrence() Method in Java。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。