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import java.util.*;class Queue1 { public static void main(String args[]) { PriorityQueue<String> queue = new PriorityQueue<String>(); queue.add("Amit"); queue.add("Vijay"); queue.add("Karan"); System.out.println("Printing queue elements:"); Iterator itr = queue.iterator(); while (itr.hasNext()) { System.out.println(itr.next()); } queue.remove(); System.out.println("Printing queue elements:"); Iterator<String> itr2 = queue.iterator(); while (itr2.hasNext()) { System.out.println(itr2.next()); } }}

Question

import java.util.*;class Queue1 { public static void main(String args[]) { PriorityQueue<String> queue = new PriorityQueue<String>(); queue.add("Amit"); queue.add("Vijay"); queue.add("Karan"); System.out.println("Printing queue elements:"); Iterator itr = queue.iterator(); while (itr.hasNext()) { System.out.println(itr.next()); } queue.remove(); System.out.println("Printing queue elements:"); Iterator<String> itr2 = queue.iterator(); while (itr2.hasNext()) { System.out.println(itr2.next()); } }}

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Solution

This is a Java program that uses a PriorityQueue to store and manipulate strings. Here's a step-by-step explanation:

  1. The program starts with the import statement import java.util.*; which imports all classes and interfaces from the java.util package. This package contains the PriorityQueue class used in the program.

  2. The Queue1 class is defined with a main method. The main method is the entry point for any Java application.

  3. Inside the main method, a PriorityQueue of Strings is created with the name queue.

  4. The add method is used to insert the strings "Amit", "Vijay", and "Karan" into the queue. The PriorityQueue in Java does not maintain the elements in any particular order but it is, by default, sorted according to the natural ordering of its elements.

  5. An Iterator is created to traverse through the elements of the queue. The hasNext method of the Iterator is used in a while loop to check if there are more elements in the queue. If there are, the next method is used to print the next element.

  6. The remove method is used to remove the head of the queue. In a PriorityQueue, the head is the least element with respect to the specified ordering.

  7. The elements of the queue are printed again using another Iterator, showing that the head of the queue has been removed.

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Similar Questions

import java.util.*;class Queue1 { public static void main(String args[]) { PriorityQueue<String> queue = new PriorityQueue<String>(); System.out.println(queue.element()); }}

What is the output of the following program:import java.util.*;class Queue1 { public static void main(String args[]) { PriorityQueue<String> queue = new PriorityQueue<String>(); queue.add("Amit"); queue.add("Vijay"); queue.add("Karan"); System.out.println("Printing queue elements:"); Iterator itr = queue.iterator(); while (itr.hasNext()) { System.out.println(itr.next()); } queue.remove(); System.out.println("Printing queue elements:"); Iterator<String> itr2 = queue.iterator(); while (itr2.hasNext()) { System.out.println(itr2.next()); } }}

What is the output of the following program:import java.util.*;class Queue1 { public static void main(String args[]) { PriorityQueue<String> queue = new PriorityQueue<String>(); System.out.println(queue.element()); }}Select one:a. None of the choicesb. Program will throw an exceptionc. No outputd. n

What is the output of the following code?import java.util.*;public class Main { public static void main(String[] args) { Queue queue = new LinkedList<>(); queue.add(1); queue.add(2); queue.add(3); System.out.println(queue.poll()); System.out.println(queue.poll()); System.out.println(queue.poll()); }}a)3 1 2b)3 2 1c)1 3 2d)1 2 3

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