Implementing the Singleton pattern
Your application needs to manage logging configurations across multiple components. Each component currently creates its own LogManager, causing configuration inconsistencies. You need to finish the implementation of the singleton pattern to ensure all components share the same logging configuration.
Questo esercizio fa parte del corso
Optimizing Code in Java
Istruzioni dell'esercizio
- Add a
staticvariable calledinstanceof typeLogManager. - Make the constructor accessible only from within the class.
- Only create a
LogManagerinstance if is it currently null.
Esercizio pratico interattivo
Prova a risolvere questo esercizio completando il codice di esempio.
public class Main {
public static void main(String[] args) {}
}
class LogManager {
// Add static instance variable to hold the instance
private static ____ ____;
private Map logConfig;
// Make constructor accessible only from within the class
___ LogManager() {
logConfig = new HashMap<>();
}
public static LogManager getInstance() {
// Only create if instance is currently null
if (____ ____ ____) {
instance = new LogManager();
}
return instance;
}
}