How Singleton pattern with Early Initialization vs Lazy Loading in Apex differs? - Salesforce Stack Exchange

public with sharing class LazyInitializedSingleton {

//private static instance of the class
private static LazyInitializedSingleton instance = null;

//private constructor to avoid creating an instance anywhere outside of this class
private LazyInitializedSingleton(){}

public static LazyInitializedSingleton getInstance(){
    if(instance == null){
        instance = new LazyInitializedSingleton();
    }
    return instance;
}