In this section: Lab 03

Lab 03

Apache Log4j, design patter Builder

Design pattern Builder

In project  lab 1 , lab 2, lab 3

  • Create a "builder" for the lab.Setting (lab.Config, lab.Setup) class.
  • Make sure that instances of lab.Setting (lab.Config, lab.Setup) can only be created using the "builder".
  • To create a "builder", create a static factory method in the lab.Setting (lab.Config, lab.Setup) class. Make sure that only this method is used externally.
  • Create a static method to create a special instance of the lab.Setting (lab.Config, lab.Setup) class, perhaps for a high difficulty game.

Library Log4j

Use the Log4j2 library for logging in the project.

  • Add logging messages to some classes. For example, to moving objects.
  • For moving objects in the TRACE level, list every position change.
  • Create a class that will generate random messages in random logging levels (for example, using a thread, chatGPT can generate funny error messages :-) )

Configure log4j2 to:

  • create a new file every time it is started
  • To create a new file when a given file size/size is reached
  • To delete files when the number/total size/age is reached
  • Try setting it to use different log levels in different packages.

Consult the documentation at https://logging.apache.org/log4j/2.x/manual/appenders.html for inspiration and look for RollingFile or DefaultRolloverStrategy

Equals a Hashcode

For the lab.data.Score class, overlay the equals and hashcode methods so that they make logical sense.

Solution

Solution can be found at  https://gitlab.vsb.cz/jez04-vyuka/java2/labs/java2lab02v1/-/tree/solution?ref_type=heads in branche solution