ConfigLoader loader = new ConfigLoader(); Properties properties = loader.load("config.properties"); String databaseUrl = ConfigMagic.getProperty("database.url", "jdbc:mysql://localhost:3306/mydb"); int maxConnections = ConfigMagic.getIntProperty("database.maxConnections", 10); ConfigLoader loader = new ConfigLoader(); Properties properties = loader.load("config.properties"); ConfigMagic.updateConfig(properties); ConfigValidator validator = new ConfigValidator(); validator.addRequiredProperty("database.url"); validator.addNumericProperty("database.maxConnections"); boolean isValid = validator.validate(properties);