Explanation of Each Class

Logger

• Central class that the developer uses.
• Manages the current log level, formatter, and output handler.
• Filters messages and sends them to appropriate destination.

LogHandler (Abstract or Interface)

• Defines the method write() for outputting logs.
• Concrete implementations:

• • • FileHandler: Writes logs to a file.

    • ConsoleHandler: Prints logs to the terminal.

Formatter

• Formats log messages with timestamps, levels, etc.
• Can be extended for custom formatting (e.g., JSON format).

LogLevel

• Enum or constants defining severity levels.
• Used by Logger to determine which messages to process.

How to Teach This

• Explain how separation of concerns is maintained through handlers and formatters.
• Use examples to show how a developer can plug in different formatters or handlers.
• Emphasize extensibility, where more handlers like RemoteHandler or DatabaseHandler can be added later.