Java.util.ArrayDeque.isEmpty() Method


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Description

The java.util.ArrayDeque.isEmpty() method returns true if this deque contains no elements.

Declaration

Following is the declaration for java.util.ArrayDeque.isEmpty() method

public boolean isEmpty()

Parameters

NA

Return Value

This method returns true if this deque contains no elements, else false.

Exception

NA

Example

The following example shows the usage of java.util.ArrayDeque.isEmpty() method.

Live Demo
package com.tutorialspoint;

import java.util.ArrayDeque;
import java.util.Deque;

public class ArrayDequeDemo {
   public static void main(String[] args) {

      // create an empty array deque with an initial capacity
      Deque<Integer> deque = new ArrayDeque<Integer>(8);

      // use add() method to add elements in the deque
      deque.add(25);
      deque.add(30);
      deque.add(20);
      deque.add(18);        

      boolean retval = deque.isEmpty();
      if (retval == true) {
         System.out.println("deque is empty");
      } else {
         System.out.println("deque is not empty");
      }

      // printing all the elements available in deque
      for (Integer number : deque) {
         System.out.println("Number = " + number);
      }
   }
}

Let us compile and run the above program, this will produce the following result −

deque is not empty
Number = 25
Number = 30
Number = 20
Number = 18

java_util_arraydeque.htm

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