Java.util.ArrayDeque.contains(Object) Method


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Description

The java.util.ArrayDeque.contains(Object) returns true if this deque contains the specified element.

Declaration

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

public boolean contains(Object o) 

Parameters

o − The object to be checked as contained in deque.

Return Value

This method returns true if this deque contains the specified element, else false.

Exception

NA

Example

The following example shows the usage of java.util.ArrayDeque.contains() 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(20);
      deque.add(30);
      deque.add(10);
      deque.add(18);        

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

      // deque contains element 10
      boolean retval = deque.contains(10); 
        
      if (retval == true) {
         System.out.println("element 10 is contained in the deque");
      } else {
         System.out.println("element 10 is not contained in the deque");
      }

      // deque does not contain element 25
      boolean retval2 = deque.contains(25);

      if (retval2 == true) {
         System.out.println("element 25 is contained in the deque");
      } else {
         System.out.println("element 25 is not contained in the deque");    
      }
   }
}      

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

Number = 20
Number = 30
Number = 10
Number = 18
element 10 is contained in the deque
element 25 is not contained in the deque

java_util_arraydeque.htm

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