Mastering Kotlin

Understanding the Singleton pattern

As previously mentioned, the Singleton pattern helps developers ensure that only a single instance of a class exists at any time for an application. This is generally achieved through limiting how a class may be instantiated by making the class constructor private, and providing a public static method that can configure, instantiate, and provide a single instance of that class for the entire application.

In Java, a simple implementation of the Singleton pattern might look something like this:

public class SimpleSingleton {    // initialize instance when loading class    private static final SimpleSingleton instance = new         SimpleSingleton();    // private constructor prevents outside instantiation    private SimpleSingleton ...