Where can the Singleton pattern be applied?

In scenarios where only one instance of a class is required throughout the system and this instance must be globally accessible.

Examples:

• Logging management: A single logger instance for centralized logging of application events.

  public class Logger {
      private static Logger instance;
  
      private Logger() {
          // Private constructor to prevent external instantiation
      }
  
      public static Logger getInstance() {
          if (instance == null) {
              instance = new Logger();
          }
          return instance;
      }
  
      public void log(String message) {
          System.out.println("LOG: " + message);
      }
  }
  

• Application configuration: Access to configuration parameters from a single source.
• Thread pool: Managing a shared thread pool for executing tasks.
• Device drivers: If a device supports only one connection or driver instance.
• Factories: To create a single instance of a factory responsible for creating other objects.
• Cache management: Centralized cache data management.