Java ArrayDeque.contains(Object o)

public boolean contains(Object o)

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

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

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

    deque.add(1);
    deque.add(2);
    deque.add(10);
    deque.add(18);

    System.out.println(deque);

    // 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");
    }
  }
}