Java ArrayDeque removeFirstOccurrence()用法及代码示例

Java中的java.util.ArrayDeque.removeFirstOccurrence(Object)方法用于从此双端队列中删除特定元素的首次出现。如果该元素仅存在一次，则将该元素删除并返回true。如果没有删除此类元素，则返回false。

用法:

Array_Deque.removeFirstOccurrence(Object O)

参数：该方法采用ArrayDeque类型的一个参数O，表示要删除其第一次出现的元素。

返回值：如果元素存在于Map中，则此方法返回true，否则返回false。

下面的程序演示了Java.util.ArrayDeque.removeFirstOccurrence()方法：

程序1：

// Java code to illustrate removeFirstOccurrence() 
import java.util.*; 
  
public class ArrayDequeDemo { 
    public static void main(String args[]) 
    { 
        // Creating an empty ArrayDeque 
        Deque<String> de_que = new ArrayDeque<String>(); 
  
        // Use add() method to add elements into the Deque 
        de_que.add("Welcome"); 
        de_que.add("To"); 
        de_que.add("Geeks"); 
        de_que.add("For"); 
        de_que.add("Geeks"); 
  
        // Displaying the ArrayDeque 
        System.out.println("Initial ArrayDeque: " + de_que); 
  
        // Removing elements using removeFirstOccurrence() method 
        de_que.removeFirstOccurrence("Geeks"); 
        de_que.removeFirstOccurrence("For"); 
  
        // Displaying the ArrayDeque after removal 
        System.out.println("ArrayDeque after removing "
                           + "elements: " + de_que); 
    } 
}

输出：

Initial ArrayDeque: [Welcome, To, Geeks, For, Geeks]
ArrayDeque after removing elements: [Welcome, To, Geeks]

示例2:

// Java code to illustrate removeFirstOccurrence() 
import java.util.*; 
  
public class ArrayDequeDemo { 
    public static void main(String args[]) 
    { 
        // Creating an empty ArrayDeque 
        Deque<Integer> de_que = new ArrayDeque<Integer>(); 
  
        // Use add() method to add elements into the Deque 
        de_que.add(10); 
        de_que.add(10); 
        de_que.add(30); 
        de_que.add(10); 
        de_que.add(30); 
  
        // Displaying the ArrayDeque 
        System.out.println("Initial ArrayDeque: " + de_que); 
  
        // Removing elements using removeFirstOccurrence() method 
        de_que.removeFirstOccurrence(30); 
        de_que.removeFirstOccurrence(5); 
  
        // Displaying the ArrayDeque after removal 
        System.out.println("ArrayDeque after removing "
                           + "elements: " + de_que); 
    } 
}

输出：

Initial ArrayDeque: [10, 10, 30, 10, 30]
ArrayDeque after removing elements: [10, 10, 10, 30]

相关用法

注：本文由纯净天空筛选整理自Chinmoy Lenka大神的英文原创作品 ArrayDeque 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。