Java ArrayDeque isEmpty()用法及代码示例

Java中的Java.util.ArrayDeque.isEmpty()方法用于检查和验证ArrayDeque是否为空。如果双端队列为空，则返回True，否则返回False。

用法:

Array_Deque.isEmpty()

参数：该方法不带任何参数。

返回值：如果双端队列为空，则该函数返回True，否则返回False。

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

示例1:

// Java code to illustrate isEmpty() 
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("4"); 
        de_que.add("Geeks"); 
  
        // Displaying the ArrayDeque 
        System.out.println("ArrayDeque: " + de_que); 
  
        // Verifying if the Deque is empty or not 
        System.out.println("The Deque is empty? " +  
                                    de_que.isEmpty()); 
  
        // Clearing the deque 
        de_que.clear(); 
  
        // Verifying if the Deque is empty or not 
        System.out.println("The Deque is empty? " +  
                                    de_que.isEmpty()); 
    } 
}

输出：

ArrayDeque: [Welcome, To, Geeks, 4, Geeks]
The Deque is empty? false
The Deque is empty? true

示例2:

// Java code to illustrate isEmpty() 
import java.util.*; 
  
public class ArrayDequeDemo { 
    public static void main(String args[]) 
    { 
        // Creating an empty ArrayDeque 
        Deque<Integer> de_que = new ArrayDeque<Integer>(); 
  
        // Displaying the ArrayDeque 
        System.out.println("ArrayDeque: " + de_que); 
  
        // Verifying if the Deque is empty or not 
        System.out.println("The Deque is empty? " +  
                                   de_que.isEmpty()); 
    } 
}

输出：

ArrayDeque: []
The Deque is empty? true

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 isEmpty() 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。