How do I implement logging in Java?

How do I implement logging in Java?

You can implement logging in Java using the built-in java.util.logging package or popular libraries like Log4j or SLF4J. Which one would you like to know more about?

Tell me about using Log4j for logging.

Log4j is a powerful logging library that allows you to configure logging levels, formats, and outputs. You can add it to your project via Maven or Gradle. Would you like a sample configuration?

Yes, please provide a sample configuration.

Here's a simple Log4j configuration in XML format:

<Configuration>
    <Appenders>
        <Console name="Console" target="SYSTEM_OUT">
            <PatternLayout pattern="%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1} - %m%n"/>
        </Console>
    </Appenders>
    <Loggers>
        <Root level="info">
            <AppenderRef ref="Console"/>
        </Root>
    </Loggers>
</Configuration>

This will log messages to the console. Do you need help with anything else?

How do I log messages at different levels?

You can log messages at different levels using methods like logger.info(), logger.debug(), logger.error(), etc. Just set the desired level in your configuration.