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In this post, you will find the solution for Java Singleton Pattern -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 Singleton Pattern – Hacker Rank Solution
Java Singleton Pattern – Hacker Rank Solution
“The singleton pattern is a design pattern that restricts the instantiation of a class to one object. This is useful when exactly one object is needed to coordinate actions across the system.”
– Wikipedia: Singleton Pattern
Complete the Singleton class in your editor which contains the following components:
- A private Singleton non parameterized constructor.
- A public String instance variable named .
- Write a static method named getSingleInstance that returns the single instance of the Singleton class.
Once submitted, our hidden Solution class will check your code by taking a String as input and then using your Singleton class to print a line.
Input Format
You will not be handling any input in this challenge.
Output Format
You will not be producing any output in this challenge.
Sample Input
hello world
Sample Output
Hello I am a singleton! Let me say hello world to you
Java Singleton Pattern – Hacker Rank Solution
import java.util.Scanner;
import java.lang.reflect.Constructor;
class Singleton {
private Singleton() {}
public String str;
private static Singleton instance = null;
public static Singleton getSingleInstance() {
if (instance == null) {
instance = new Singleton();
}
return instance;
}
}
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