Singelton

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Once read a book about patterns , I faced with this one , the implementation of this pattern was the same as in this code , but something is gonna wrong with it, I require to help me correct this.

A class is a singleton if it lets you create just one object of its type.

Implement the Singleton pattern:
1. Create a Singleton class in a separate file.
2. Add a static getInstance() method to it.
3. The getInstance method must return the same Singleton object any time the getInstance method is called.
4. Think about how you can prevent the creation of additional instances of this class.
5. Make all the constructors of the Singleton class private.
6. As a result, it should ONLY be possible to create an object (instance of this class) using the getInstance method.

Requirements:

The Singleton class must be in a separate file.
The Singleton class should prevent Singleton objects from being created outside the class.
The Singleton class must have a private static Singleton field instance.
The Singleton class must implement the public static getInstance method, which returns the value of the field instance.
The getInstance method must ALWAYS return the same object.

package com.codegym.task.task14.task1421; /* Singleton */ public class Solution { public static void main(String[] args) { } }

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VIVEK BARUAH

Level 20 , Eluru, India

4 June 2019, 08:03

solution

Check the name of the file, classes and objects. It should be "Singleton" not "Singelton"

Sean

Level 24 , Phoenix, United States

29 April 2019, 22:01

I've completed the task too long ago to test my code with the validator, but I think that if you remove the body from the constructor, it will work. That would be a "lazy initialization." Java Singleton Design Pattern Best Practices with Examples.