What is queue.isempty() in Java?

The queue.isEmpty() function in Java is used to check if a queue is empty or not. queue.isEmpty() returns true if the queue is empty; otherwise, it returns false.

The illustration below shows the visual representation of the queue.isEmpty() function.

Syntax

public boolean isEmpty()

Parameter

The queue.isEmpty() function does not require any parameters.

Return value

If the queue is empty, the queue.isEmpty() function returns true. Otherwise, it returns false.

Code

import java.util.*;
class JAVA {
    public static void main( String args[] ) {
        
        Queue<Integer> Queue = new LinkedList<Integer>();
        
        // adding elements to Queue
        Queue.add(1);
        Queue.add(3);
        Queue.add(5);
        Queue.add(2);
        Queue.add(0);
        
        //filed queue
        System.out.println("The Queue is empty: " + Queue.isEmpty());
        
        Queue<Integer> Queue_2 = new LinkedList<Integer>();
        //empty queue
        System.out.println("The Queue_2 is empty: " + Queue_2.isEmpty());
    }
}