Java PriorityQueue contains() Method

The contains() method of PriorityQueue class returns true if the specified element is present in this queue.

Syntax

Parameter

o - It is the object that is to be checked for occurrence in this queue.

Specified By

The contains() method of PriorityQueue class is specified by contains() method in interface Collection<E>

Override

The contains() method of class PriorityQueue is overrided by contains() method in class AbstractCollection.

Return Value

The contains() method returns true if the specified element is present in this queue.

Example 1

import java.util.PriorityQueue;
import java.util.Queue;

public class JavaPriorityQueueContainsExample1 {
public static void main(String[] args) {
Queue<String> queue = new PriorityQueue<String>();
queue.add("Ram");
queue.add("Sham");
queue.add("Mira");
queue.add("Rajesh");
for (String xyz : queue){
System.out.println(xyz);
        }
/*contains() method will return a boolean value if the
          specified object is present in the queue*/
if(queue.contains("Ram")) {
System.out.println("Ram is present");
       }
else{
System.out.println("Ram is absent");
       }
    }
}

Test it Now

Output:

Mira
Rajesh
Ram
Sham
Ram is present

Example 2

import java.util.PriorityQueue;
import java.util.Queue;
import java.util.Scanner;

public class JavaPriorityQueueContainsExample2 {

public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);

        Queue<Integer>Pqueue = new PriorityQueue<Integer>();

Pqueue.add(3);
Pqueue.add(5);
Pqueue.add(7);
Pqueue.add(2);

System.out.println("Q. Enter a prime no btw 1-10.");
System.out.print("Ans ");int a = scanner.nextInt();

if(Pqueue.contains(a)){

System.out.println("Your answer is correct.");
        }
else{

System.out.println("Incorrect answer!");
        }
    }
}

Output:

Q. Enter a prime no btw 1-10.
Ans 6
Incorrect answer!

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Java PriorityQueue Class