ArrayDeque contains() Method in Java
Last Updated :
20 Sep, 2022
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.
The Time Complexity of the contains() method is O(N) i.e Linear.
Below programs illustrate the Java.util.ArrayDeque.contains() method:
Program 1:
Java
import java.util.*;
public class ArrayDequeDemo {
public static void main(String args[])
{
Deque<String> de_que = new ArrayDeque<String>();
de_que.add( "Welcome" );
de_que.add( "To" );
de_que.add( "Geeks" );
de_que.add( "4" );
de_que.add( "Geeks" );
System.out.println( "ArrayDeque: " + de_que);
System.out.println( "Does the deque contains 'Geeks'? "
+ de_que.contains( "Geeks" ));
System.out.println( "Does the deque contains '4'? "
+ de_que.contains( "4" ));
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
import java.util.*;
public class ArrayDequeDemo {
public static void main(String args[])
{
Deque<Integer> de_que = new ArrayDeque<Integer>();
de_que.add( 10 );
de_que.add( 15 );
de_que.add( 30 );
de_que.add( 20 );
de_que.add( 5 );
System.out.println( "ArrayDeque: " + de_que);
System.out.println( "Does the Deque contains '15'? "
+ de_que.contains( 15 ));
System.out.println( "Does the Deque contains '2'? "
+ de_que.contains( 2 ));
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
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