Day 21: Generics In Java | 30 Days Of Code | Hackerrank Programming Solutions

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Link for the ProblemDay 21: Generics – Hacker Rank Solution

Day 21: Generics – Hacker Rank Solution


Today we’re discussing Generics; be aware that not all languages support this construct, so fewer languages are enabled for this challenge. Check out the Tutorial tab for learning materials and an instructional video!

Write a single generic function named printArray; this function must take an array of generic elements as a parameter (the exception to this is C++, which takes a vector). The locked Solution class in your editor tests your function.

Note: You must use generics to solve this challenge. Do not write overloaded functions.

Input Format

The locked Solution class in your editor will pass different types of arrays to your printArray function.


  • You must have exactly  function named printArray.

Output Format

Your printArray function should print each element of its generic array parameter on a new line.

Day 21: Generics – Hacker Rank Solution
import java.util.Scanner;

 * @author Techno-RJ

class Printer<T> {
	void printArray(T[] inputArray) {

		for (T t : inputArray) {


public class Day21Generics {

	public static void main(String args[]) {
		Scanner sc = new Scanner(;
		int n = sc.nextInt();
		Integer[] intArray = new Integer[n];
		for (int i = 0; i < n; i++) {
			intArray[i] = sc.nextInt();

		n = sc.nextInt();
		String[] stringArray = new String[n];
		for (int i = 0; i < n; i++) {
			stringArray[i] =;

		Printer<Integer> intPrinter = new Printer<Integer>();
		Printer<String> stringPrinter = new Printer<String>();
		if (Printer.class.getDeclaredMethods().length > 1) {
			System.out.println("The Printer class should only have 1 method named printArray.");

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