Java ArrayDeque removeFirstOccurrence()用法及代碼示例

Java中的java.util.ArrayDeque.removeFirstOccurrence(Object)方法用於從此雙端隊列中刪除特定元素的首次出現。如果該元素僅存在一次，則將該元素刪除並返回true。如果沒有刪除此類元素，則返回false。

用法:

Array_Deque.removeFirstOccurrence(Object O)

參數：該方法采用ArrayDeque類型的一個參數O，表示要刪除其第一次出現的元素。

返回值：如果元素存在於Map中，則此方法返回true，否則返回false。

下麵的程序演示了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); 
    } 
}

輸出：

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); 
    } 
}

輸出：

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

相關用法

注：本文由純淨天空篩選整理自Chinmoy Lenka大神的英文原創作品 ArrayDeque removeFirstOccurrence() Method in Java。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。