Algorithm
Problem Name:
In this HackerRank Functions in Java programming problem 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 str.
- 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
Code Examples
#1 Code Example with Java Programming
Code -
Java Programming
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;
}
}