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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:






// Java code to illustrate contains()
import java.util.PriorityQueue;
  
public class PriorityQueueDemo {
    public static void main(String args[])
    {
        // Creating an empty PriorityQueue
        PriorityQueue<String> queue = new PriorityQueue<String>();
  
        // Use add() method to add elements into the Queue
        queue.add("Welcome");
        queue.add("To");
        queue.add("Geeks");
        queue.add("4");
        queue.add("Geeks");
  
        // Displaying the PriorityQueue
        System.out.println("PriorityQueue: " + queue);
  
        // Check for "Geeks" in the queue
        System.out.println("Does the Queue contains 'Geeks'? "
        +queue.contains("Geeks"));
  
        // Check for "4" in the queue
        System.out.println("Does the Queue contains '4'? "
        +queue.contains("4"));
  
        // Check if the Queue contains "No"
        System.out.println("Does the Queue contains 'No'? "
        +queue.contains("No"));
    }
}


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:




// Java code to illustrate contains()
import java.util.*;
  
public class PriorityQueueDemo {
    public static void main(String args[])
    {
        // Creating an empty PriorityQueue
        PriorityQueue<Integer> queue = new PriorityQueue<Integer>();
  
        // Use add() method to add elements into the Queue
        queue.add(10);
        queue.add(15);
        queue.add(30);
        queue.add(20);
        queue.add(5);
  
        // Displaying the PriorityQueue
        System.out.println("PriorityQueue: " + queue);
  
        // Check for '15' in the queue
        System.out.println("Does the Queue contains '15'? "
        +queue.contains(15));
  
        // Check for '2' in the queue
        System.out.println("Does the Queue contains '2'? "
        +queue.contains(2));
  
        // Check if the Queue contains '10'
        System.out.println("Does the Queue contains '10'? "
        +queue.contains(10));
    }
}


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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