Looking for any Java Game Code

I have my a final project for my Computer Science class which is a Java code for playing against the computer, I would like to ask if anyone can provide me a code to use and study.

This is the purpose

The goal of this project is to showcase your comprehension of all the computer science skills that you have developed so far in this course.
This would include:

-Writing a program in a professional manner (comments, identifiers, and indentation)

-Using the most effective variable types

-Using control structure efficiently (switch statements, if statements, and loops)

-Using arrays and methods to simplify code

-Using something that was self taught through research (objects, classes, file I/O)

Anything will help, a game code that is playable against the computer, Thanks.