Java ArrayDeque isEmpty()用法及代碼示例

Java中的Java.util.ArrayDeque.isEmpty()方法用於檢查和驗證ArrayDeque是否為空。如果雙端隊列為空，則返回True，否則返回False。

用法:

Array_Deque.isEmpty()

參數：該方法不帶任何參數。

返回值：如果雙端隊列為空，則該函數返回True，否則返回False。

下麵的程序演示了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()); 
    } 
}

輸出：

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()); 
    } 
}

輸出：

ArrayDeque: []
The Deque is empty? true

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 isEmpty() 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。