Layout class in Log4j?

Layout:

Layout Object is responsible for formatting logging messages.

Appender object uses the support of Layout object for formatting the messages.

Layout is an interface, implemented classes are..

•         SimpleLayout

•         PatternLayout

•         HTMLLayout

•         XMLLayout

•         DataLayout   etc.........

The most frequently used Layout  is PatternLayout.Because, it has provided ConversionPattern through which we can make a logging statement as more informative.

The most ConversionPattern are.....

%t	Add thread name
%-5p	Add a priority level with left justification
%d	Adds Date and Time. We use %d{dd/mm/yyyy hh:mm:ss}-to add a time & date.
%c	Add fully qualified class name
%m	Adds message
%n	Adds new line (next line).
%L	Adds line number of the message in a program
%M	Adds method name from which the logging message in generated
%r	Adds the milliseconds of time completed from the construction of layout of current msg.