log4j Online Quiz

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.

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

A - It is designed to handle Java Exceptions from the start.

B - It uses multiple levels, namely ALL, TRACE, DEBUG, INFO, WARN, ERROR and FATAL.

C - The format of the log output can be easily changed by extending the Layout class.

D - All of the above.

Answer : D

Explanation

All of the above options are correct.

Q 2 - Which of the following is correct about Filter object?

A - The Filter object is used to analyze logging information and make further decisions on whether that information should be logged or not.

B - An Appender objects can have several Filter objects associated with them.

C - Both of the above.

D - None of the above.

Answer : C

Explanation

Both of the above options are correct.

Q 3 - Which of the following method of logger print a log message in debug 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 : A

Explanation

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

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 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 intent of %-20c format modifier?

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

B - Right pad with spaces if the category name is less than 20 characters long.

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

D - None of the above.

Answer : B

Explanation

%-20c − Right pad with spaces if the category name is less than 20 characters long.

Q 7 - Which of the following set title for the HTML file using HTMLLayout?

A - HTMLLayout.setContentType(String)

B - HTMLLayout.setLocationInfo(String)

C - HTMLLayout.setTitle(String)

D - None of the above.

Answer : C

Explanation

HTMLLayout.setTitle(String) − Sets the title for the HTML file. Default is log4j Log Messages.

Q 8 - Which of the following DatePattern configuration of DailyRollingFileAppender rolls over the logs every minute?

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

B - '.' yyyy-MM-dd

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

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

Answer : A

Explanation

'.' yyyy-MM-dd-HH-mm − Roll over every minute.

Q 9 - How will you put the logs in database using log4j??

A - Using JDBCAppender

B - Using RollingFileAppender

C - Using FileAppender

D - None of the above.

Answer : A

Explanation

The log4j API provides the org.apache.log4j.jdbc.JDBCAppender object, which can put logging information in a specified database.

Q 10 - The Level object defines the granularity and priority of any logging information.

A - true

B - false

Answer : A

Explanation

true − The Level object defines the granularity and priority of any logging information. There are seven levels of logging defined within the API: OFF, DEBUG, INFO, ERROR, WARN, FATAL, and ALL.

log4j_questions_answers.htm