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In this post, you will find the solution for Java Generics-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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Introduction To Java
JAVA was developed by James Gosling at Sun Microsystems Inc in the year 1991, later acquired by Oracle Corporation. It is a simple programming language. Java makes writing, compiling, and debugging programming easy. It helps to create reusable code and modular programs.
Java is a class-based, object-oriented programming language and is designed to have as few implementation dependencies as possible. A general-purpose programming language made for developers to write once run anywhere that is compiled Java code can run on all platforms that support Java. Java applications are compiled to byte code that can run on any Java Virtual Machine. The syntax of Java is similar to c/c++.
Link for the Problem – Java Generics – Hacker Rank Solution
Java Generics – Hacker Rank Solution
Problem :
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.
Java Generics – Hacker Rank Solution
import java.lang.reflect.Method;
class Printer {
<T> void printArray(T[] array) {
for (T element : array) {
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!");
assert count == 1;
}
}
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