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Java Collections - ArrayDeque.contains() Examples

[Last Updated: Nov 8, 2025]

Java Collections Java Java API

Class:

java.util.ArrayDeque

Method:

public boolean contains(Object o)

Returns true if and only if this deque contains at least one element e such that o.equals(e).

Examples

package com.logicbig.example.arraydeque;

import java.util.ArrayDeque;

public class ContainsExample {

    public static void main(String... args) {
        ArrayDeque<Integer> ad = new ArrayDeque<>();
        ad.add(3);
        ad.add(5);
        System.out.println(ad);
        System.out.println(ad.contains(3));
        System.out.println(ad.contains(4));
    }
}

Output

[3, 5]
true
false

See Also