@iluwatar, the converages check is so strange as I find the check of my source at lease reach to 86.36.

• Put under review badge to the pull request
• Does the example code implement the pattern correctly and follow good coding practices?
• Does the example code have enough test coverage?
• Is the example code commented well enough?
• Is the example code following JavaDoc conventions?
• Are the project coding conventions being followed?
• Is the class diagram generated correctly?
• Is the index.md implemented correctly so the pattern will show correctly on the web site?
• Is the originator of the design pattern properly credited?

Here are my remarks:

• The pattern explanation in App.java could be a bit more verbose and the typos and phrasing should be fixed
• The originator of the design pattern should be properly credited in index.md. See the pattern template

Overall the implementation is well done and only minor issues were found. Please comment on this thread when you've implemented the changes and I will review again.

Thanks @iluwatar 's comments. Fix is done, please review.

Thank you @hoswey Well done!

Thanks for your contribution @hoswey