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.

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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