Day 4: Class vs. Instance In Java | 30 Days Of Code | Hackerrank Programming Solutions

Hello Programmers/Coders, Today we are going to share solutions of Programming problems of 30 Days Of Code, HackerRank. At Each Problem with Successful submission with all Test Cases Passed, you will get an score or marks. And after solving maximum problems, you will be getting stars. This will highlight your profile to the recruiters.

In this post, you will find the solution for Day 4: Class vs. Instance in Java-HackerRank Problem. We are providing the correct and tested solutions of coding problems present on HackerRank. If you are not able to solve any problem, then you can take help from our Blog/website.

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Link for the ProblemDay 4: Class vs. Instance – Hacker Rank Solution

Day 4: Class vs. Instance – Hacker Rank Solution


In this challenge, we’re going to learn about the difference between a class and an instance; because this is an Object Oriented concept, it’s only enabled in certain languages. Check out the Tutorial tab for learning materials and an instructional video!

Write a Person class with an instance variable, , and a constructor that takes an integer, , as a parameter. The constructor must assign  to  after confirming the argument passed as  is not negative; if a negative argument is passed as , the constructor should set  to  and print Age is not valid, setting age to 0.. In addition, you must write the following instance methods:

  1. yearPasses() should increase the  instance variable by .
  2. amIOld() should perform the following conditional actions:
    • If , print You are young..
    • If  and , print You are a teenager..
    • Otherwise, print You are old..

To help you learn by example and complete this challenge, much of the code is provided for you, but you’ll be writing everything in the future. The code that creates each instance of your Person class is in the main method. Don’t worry if you don’t understand it all quite yet!

Note: Do not remove or alter the stub code in the editor.

Input Format

Input is handled for you by the stub code in the editor.

The first line contains an integer,  (the number of test cases), and the  subsequent lines each contain an integer denoting the  of a Person instance.


Output Format

Complete the method definitions provided in the editor so they meet the specifications outlined above; the code to test your work is already in the editor. If your methods are implemented correctly, each test case will print  or  lines (depending on whether or not a valid  was passed to the constructor).

Sample Input


Sample Output

Age is not valid, setting age to 0.
You are young.
You are young.

You are young.
You are a teenager.

You are a teenager.
You are old.

You are old.
You are old.


Test Case 0
Because , our code must set  to  and print the “Age is not valid…” message followed by the young message. Three years pass and , so we print the young message again.

Test Case 1: 
Because , our code should print that the person is young. Three years pass and , so we print that the person is now a teenager.

Test Case 2: 
Because , our code should print that the person is a teenager. Three years pass and , so we print that the person is old.

Test Case 3: 
Because , our code should print that the person is old. Three years pass and the person is still old at , so we print the old message again.

The extra line at the end of the output is supposed to be there and is trimmed before being compared against the test case’s expected output. If you’re failing this challenge, check your logic and review your print statements for spelling errors.

Day 4: Class vs. Instance– Hacker Rank Solution
class Person {
	private int age;

	public Person(int initialAge) {
		if (initialAge < 0) {
			System.out.println("Age is not valid, setting age to 0.");
		this.age = initialAge;
		// Add some more code to run some checks on initialAge

	public void amIOld() {
		// Write code determining if this person's age is old and print the correct
		// statement:
		if (age < 13) {
			System.out.println("You are young.");
		} else if (age >= 13 && age < 18) {
			System.out.println("You are a teenager.");

		} else {
			System.out.println("You are old.");


	public void yearPasses() {
		// Increment this person's age.

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