How to check if ArrayDeque contains element in Java ?

Declaration :

public boolean contains(Object o)

1	public boolean contains(Object o)

Explanation :

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

Java Program : Example

Below example will explain java.util.ArrayDeque.contains() method.

package com.c4learn;
import java.util.ArrayDeque;
import java.util.Deque;
public class ArrayDequeDemo {
   public static void main(String[] args) {
      // Create empty array deque with an initial capacity
	   Deque<Integer> deque = new ArrayDeque<Integer>(8);
      // Use add() method to add elements
      deque.add(100);
      deque.add(200);
      deque.add(300);
      deque.add(400);        
      deque.add(500);        
      System.out.println("Deque Before : " + deque);
      boolean flag = deque.contains(100);
      if(flag == true)
    	  System.out.println("Element is present");
      else
    	  System.out.println("Element is absent");
   }
}

package com.c4learn;

import java.util.ArrayDeque;

import java.util.Deque;

public class ArrayDequeDemo {

public static void main(String[] args) {

// Create empty array deque with an initial capacity

Deque<Integer> deque = new ArrayDeque<Integer>(8);

// Use add() method to add elements

deque.add(100);

deque.add(200);

deque.add(300);

deque.add(400);

deque.add(500);

System.out.println("Deque Before : " + deque);

boolean flag = deque.contains(100);

if(flag == true)

System.out.println("Element is present");

else

System.out.println("Element is absent");

}

Output of Program :

Deque Before : [100, 200, 300, 400, 500]
Element is present

1 2	Deque Before : [100, 200, 300, 400, 500] Element is present

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