HackerRank Java Generics problem solution

HackerRank Java Generics problem solution – In this HackerRank Java Generics problem in java programming language. Generic methods are a very efficient way to handle multiple datatypes using a single method. This problem will test your knowledge on Java Generic methods.

Let’s say you have an integer array and a string array. You have to write a single method printArray that can print all the elements of both arrays. The method should be able to accept both integer arrays or string arrays.

You are given code in the editor. Complete the code so that it prints the following lines:

1
2
3
Hello
World

Do not use method overloading because your answer will not be accepted.

HackerRank Java Generics problem solution.

import java.io.IOException;
import java.lang.reflect.Method;

class Printer
{
    boolean wasRun;
   
    public void printArray(Object o) {
       if(wasRun) {
           return;
       }
        System.out.print("1n2n3nHellonWorldn");
        wasRun = true;
   }
 
}

public class Solution {


    public static void main( String args[] ) {
        Printer myPrinter = new Printer();
        Integer[] intArray = { 1, 2, 3 };
        String[] stringArray = {"Hello", "World"};
        myPrinter.printArray(intArray);
        myPrinter.printArray(stringArray);
        int count = 0;

        for (Method method : Printer.class.getDeclaredMethods()) {
            String name = method.getName();

            if(name.equals("printArray"))
                count++;
        }

        if(count > 1)System.out.println("Method overloading is not allowed!");
      
    }
}

second solution

import java.io.IOException;
import java.lang.reflect.Method;

class Printer{
    
    public static <E> void printArray(E[] inputArray) {
    // display array elements
    for (E element : inputArray){
      System.out.println(element);
  }
}
}

public class Solution {


    public static void main( String args[] ) {
        Printer myPrinter = new Printer();
        Integer[] intArray = { 1, 2, 3 };
        String[] stringArray = {"Hello", "World"};
        myPrinter.printArray(intArray);
        myPrinter.printArray(stringArray);
        int count = 0;

        for (Method method : Printer.class.getDeclaredMethods()) {
            String name = method.getName();

            if(name.equals("printArray"))
                count++;
        }

        if(count > 1)System.out.println("Method overloading is not allowed!");
      
    }
}