log4j Online Quiz

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Following quiz provides Multiple Choice Questions (MCQs) related to log4j Framework. You will have to read all the given answers and click over the correct answer. If you are not sure about the answer then you can check the answer using Show Answer button. You can use Next Quiz button to check new set of questions in the quiz.

Questions and Answers

Q 1 - Which of the following is correct about log4j?

A - It is thread-safe.

B - It is optimized for speed.

C - It is based on a named logger hierarchy.

D - All of the above.

Answer : D

Explanation

All of the above options are correct.

Q 2 - Which of the following is correct about target in Appender?

A - Appender uses the target and the conversion pattern associated with them to format the logging information.

B - The target may be a console, a file, or another item depending on the appender.

C - The target is required to control the filtration of the log messages.

D - Appender can have a target associated with it independent of the logger level.

Answer : B

Explanation

target − The target may be a console, a file, or another item depending on the appender.

Q 3 - Which of the following method of logger print a log message in info mode?

A - public void debug(Object message)

B - public void error(Object message)

C - public void fatal(Object message)

D - public void info(Object message)

Answer : D

Explanation

public void info(Object message) of Logger class prints messages with the level Level.INFO.

Q 4 - Which of the following level designates all levels including custom levels?

Answer : D

Explanation

ALL − All levels including custom levels.

Q 5 - What is the purpose of l character used in the conversionPattern of PatternLayout object?

A - Used to output location information of the caller which generated the logging event.

B - Used to output the line number from where the logging request was issued.

C - Used to output the application supplied message associated with the logging event.

D - Used to output the method name where the logging request was issued.

Answer : A

Explanation

l − Used to output location information of the caller which generated the logging event.

Q 6 - What is the purpose of % character used in the conversionPattern of PatternLayout object?

A - Used to output the NDC (nested diagnostic context) associated with the thread that generated the logging event.

B - Used to print the information stored in the MDC against the key.

C - Used to print a % sign.

D - Used to Left pad with spaces if the category name is less than 20 characters long.

Answer : C

Explanation

% − The literal percent sign. %% will print a % sign.

Q 7 - What is the purpose of encoding configuration of FileAppender?

A - output stream to the file being flushed with each append operation.

B - to set the platform-specific encoding scheme.

C - to set the threshold level for this appender.

D - to set the name of the log file.

Answer : B

Explanation

encoding − It is possible to use any character-encoding. By default, it is the platform-specific encoding scheme.

Q 8 - What is the purpose of DatePattern configuration of DailyRollingFileAppender?

A - to set the critical size of the file above which the file will be rolled.

B - to set the number of backup files to be created.

C - to set when to roll over the file.

D - None of the above.

Answer : C

Explanation

DatePattern − This indicates when to roll over the file and the naming convention to be followed. By default, roll over is performed at midnight each day.

Q 9 - Is log4j thread safe?

Answer : A

Explanation

true − log4j is thread-safe.

Q 10 - Logger uses the Layout objects and the conversion pattern associated with them to format the logging information.

Answer : B

Explanation

false − Appender uses the Layout objects and the conversion pattern associated with them to format the logging information.

log4j_questions_answers.htm

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