ArrayDeque contains() Method in Java
The Java.util.ArrayDeque.contains() method in Java is used to check or verify whether a specific element is present in the Deque or not.
Syntax:
Array_Deque.contains(Object element)
Parameters: The parameter element is of the type of ArrayDeque. This is the element that needs to be tested if it is present in the deque or not.
Return Value: The method returns True if the element is present in the deque otherwise it returns False.
Below programs illustrate the Java.util.ArrayDeque.contains() method:
Program 1:
// Java code to illustrate contains() import java.util.*; public class ArrayDequeDemo { public static void main(String args[]) { // Creating an empty ArrayDeque Deque<String> de_que = new ArrayDeque<String>(); // Use add() method to add elements into the Queue de_que.add( "Welcome" ); de_que.add( "To" ); de_que.add( "Geeks" ); de_que.add( "4" ); de_que.add( "Geeks" ); // Displaying the ArrayDeque System.out.println( "ArrayDeque: " + de_que); // Check for "Geeks" in the deque System.out.println( "Does the deque contains 'Geeks'? " + de_que.contains( "Geeks" )); // Check for "4" in the deque System.out.println( "Does the deque contains '4'? " + de_que.contains( "4" )); // Check if the deque contains "No" System.out.println( "Does the deque contains 'No'? " + de_que.contains( "No" )); } } |
Output:
ArrayDeque: [Welcome, To, Geeks, 4, Geeks] Does the deque contains 'Geeks'? true Does the deque contains '4'? true Does the deque contains 'No'? false
Program 2:
// Java code to illustrate contains() import java.util.*; public class ArrayDequeDemo { public static void main(String args[]) { // Creating an empty ArrayDeque Deque<Integer> de_que = new ArrayDeque<Integer>(); // Use add() method to add elements into the Queue de_que.add( 10 ); de_que.add( 15 ); de_que.add( 30 ); de_que.add( 20 ); de_que.add( 5 ); // Displaying the ArrayDeque System.out.println( "ArrayDeque: " + de_que); // Check for '15' in the Deque System.out.println( "Does the Deque contains '15'? " + de_que.contains( 15 )); // Check for '2' in the Deque System.out.println( "Does the Deque contains '2'? " + de_que.contains( 2 )); // Check if the Deque contains '10' System.out.println( "Does the Deque contains '10'? " + de_que.contains( 10 )); } } |
Output:
ArrayDeque: [10, 15, 30, 20, 5] Does the Deque contains '15'? true Does the Deque contains '2'? false Does the Deque contains '10'? true