HackerRank Java- 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.
- import java.io.*;
- import java.util.*;
- import java.text.*;
- import java.math.*;
- import java.util.regex.*;
- import java.lang.reflect.*;
-
-
- 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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