Quiz for Logging (Log4j, SLF4J)

Q1: Which logging framework is considered a facade for other logging frameworks?

A. Log4j B. SLF4J C. Logback D. Commons Logging

Q2: What is the default logging implementation for SLF4J?

A. Log4j B. JUL (java.util.logging) C. SimpleLogger D. Logback

Q3: Which method is used to log error messages in Log4j?

A. log() B. warn() C. info() D. error()

Q4: Which file is typically used to configure Log4j settings?

A. log4j.conf B. log4j.properties C. log4j.config D. logger.xml

Q5: Which logging level logs the most detailed information?

A. WARN B. DEBUG C. INFO D. TRACE

Q6: Which SLF4J method is used to log warnings?

A. info() B. debug() C. warn() D. trace()

Q7: Which method checks if debug logging is enabled in SLF4J?

A. isInfoEnabled() B. isTraceEnabled() C. isDebugEnabled() D. isWarnEnabled()

Q8: Which logging level is higher than INFO but lower than ERROR?

A. TRACE B. WARN C. DEBUG D. FATAL

Q9: What is the main purpose of logging in applications?

A. Performance tuning B. Error suppression C. Monitoring and debugging D. Security auditing

Q10: Which class is used in SLF4J to obtain a logger instance?

A. LoggerFactory B. LogManager C. LogHandler D. LoggerUtil

Q11: Which logging level should be used for serious failures in Log4j?

A. WARN B. DEBUG C. FATAL D. TRACE

Q12: Which SLF4J placeholder is used to insert values in log messages?

A. #{} B. {} C. ${} D. <>

Q13: What is the role of appenders in Log4j?

A. Format log messages B. Filter messages C. Store log configuration D. Send logs to targets like files or console

Q14: What is a logger in SLF4J and Log4j?

A. A class for managing test cases B. An object for managing file permissions C. An object that records log messages D. An object that formats strings

Q15: Which component in Log4j determines the format of log messages?

A. Filter B. Appender C. Layout D. Logger

Q16: How do you get a logger in Log4j 2?

A. LoggerFactory.getLogger() B. LogManager.getLogger() C. Logger.getInstance() D. LoggerManager.create()

Q17: What is the advantage of using SLF4J over directly using Log4j?

A. Easier installation B. More readable syntax C. It allows switching underlying logging frameworks easily D. Better file management

Q18: What happens if no logging framework is found with SLF4J?

A. Compilation error B. No logs will be shown C. It throws runtime exception D. It defaults to a simple implementation

Q19: Which of the following is a valid Log4j logging level?

A. VERBOSE B. LOW C. INFO D. NOTICE

Q20: Which file extension is commonly used for Log4j 2 configuration?

A. .log B. .xml C. .json D. .yml