PriorityQueue contains() Method in Java
Last Updated :
10 Dec, 2018
The Java.util.PriorityQueue.contains() method is used to check whether a specific element is present in the PriorityQueue or not. So basically it is used to check if a Queue contains any particular element or not.
Syntax:
Priority_Queue.contains(Object element)
Parameters: The parameter element is of the type of PriorityQueue. This is the element that needs to be tested if it is present in the queue or not.
Return Value: The method returns True if the element is present in the queue otherwise it returns False.
Below programs illustrate the Java.util.PriorityQueue.contains() method:
Program 1:
import java.util.PriorityQueue;
public class PriorityQueueDemo {
public static void main(String args[])
{
PriorityQueue<String> queue = new PriorityQueue<String>();
queue.add( "Welcome" );
queue.add( "To" );
queue.add( "Geeks" );
queue.add( "4" );
queue.add( "Geeks" );
System.out.println( "PriorityQueue: " + queue);
System.out.println( "Does the Queue contains 'Geeks'? "
+queue.contains( "Geeks" ));
System.out.println( "Does the Queue contains '4'? "
+queue.contains( "4" ));
System.out.println( "Does the Queue contains 'No'? "
+queue.contains( "No" ));
}
}
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Output:
PriorityQueue: [4, Geeks, To, Welcome, Geeks]
Does the Queue contains 'Geeks'? true
Does the Queue contains '4'? true
Does the Queue contains 'No'? false
Program 2:
import java.util.*;
public class PriorityQueueDemo {
public static void main(String args[])
{
PriorityQueue<Integer> queue = new PriorityQueue<Integer>();
queue.add( 10 );
queue.add( 15 );
queue.add( 30 );
queue.add( 20 );
queue.add( 5 );
System.out.println( "PriorityQueue: " + queue);
System.out.println( "Does the Queue contains '15'? "
+queue.contains( 15 ));
System.out.println( "Does the Queue contains '2'? "
+queue.contains( 2 ));
System.out.println( "Does the Queue contains '10'? "
+queue.contains( 10 ));
}
}
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Output:
PriorityQueue: [5, 10, 30, 20, 15]
Does the Queue contains '15'? true
Does the Queue contains '2'? false
Does the Queue contains '10'? true
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