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
