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 log4j objects are responsible for formatting logging information in different styles?

D - None of the above.

Answer : C

Explanation

layouts − Responsible for formatting logging information in different styles.

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 potentially harmful situations?

Answer : C

Explanation

WARN − Designates potentially harmful situations.

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

A - Outputs the platform dependent line separator character or characters.

B - Used to output the priority of the logging event.

C - Used to output the number of milliseconds elapsed from the construction of the layout until the creation of the logging event.

D - Used to output the name of the thread that generated the logging event.

Answer : C

Explanation

r − Used to output the number of milliseconds elapsed from the construction of the layout until the creation of the logging event.

Q 6 - What is the intent of %20.30c format modifier?

A - Left pad with spaces if the category name is shorter than 20 characters. However, if the category name is longer than 30 characters, then truncate from the beginning.

B - Right pad with spaces if the category name is shorter than 20 characters. However, if the category name is longer than 30 characters, then truncate from the beginning.

C - Truncate from the beginning if the category name is longer than 20 characters.

D - None of the above.

Answer : A

Explanation

%20.30c − Left pad with spaces if the category name is shorter than 20 characters. However, if the category name is longer than 30 characters, then truncate from the beginning.

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

A - logging information to be appended to the end of the same file.

B - to set the buffered writing.

C - to set the buffer size

D - None of the above.

Answer : B

Explanation

bufferedIO − This flag indicates whether we need buffered writing enabled. By default, it is set to false.

Q 8 - Which of the following DatePattern configuration of DailyRollingFileAppender rolls over the logs on the first day of each week depending upon the locale?

A - '.' yyyy-MM-dd-HH-mm

B - '.' yyyy-ww

C - '.' yyyy-MM-dd-a

D - '.' yyyy-MM-dd-HH

Answer : B

Explanation

'.' yyyy-ww − Roll over on the first day of each week depending upon the locale.

Q 9 - What is the purpose of sql configuration of JDBCAppender?

A - to set the driver class to the specified string.

B - to set the database password.

C - to specify the SQL statement to be executed every time a logging event occurs.

D - None of the above.

Answer : C

Explanation

sql − Specifies the SQL statement to be executed every time a logging event occurs. This could be INSERT, UPDATE, or DELETE.

Q 10 - By default, the LogManager looks for a file named log4j.properties in the CLASSPATH.

Answer : B

Explanation

true − By default, the LogManager looks for a file named log4j.properties in the CLASSPATH.

log4j_questions_answers.htm

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