Can you share your experience with implementing or using design patterns?

In one of my Java projects, I used the Singleton pattern to manage access to the application's configuration parameters. This ensured that settings are loaded only once and are accessible throughout the program.

I also applied the Factory pattern to create objects of different types based on input data, which simplified extending functionality without modifying existing code.

Example of using Singleton:

public class Configuration {
    private static Configuration instance;
    private Properties props;

    private Configuration() {
        props = new Properties();
        // load settings
    }

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

    public String getProperty(String key) {
        return props.getProperty(key);
    }
}