lots of exercises in java... from https://github.com/exercism/java
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README.md

Hello World

The classical introductory exercise. Just say "Hello, World!".

"Hello, World!" is the traditional first program for beginning programming in a new language or environment.

The objectives are simple:

  • Write a function that returns the string "Hello, World!".
  • Run the test suite and make sure that it succeeds.
  • Submit your solution and check it at the website.

If everything goes well, you will be ready to fetch your first real exercise.

Since this is your first Java exercise, we've included a detailed TUTORIAL.md file that guides you through your solution. Check it out for tips and assistance!

To run the tests:

$ gradle test

For more detailed info about the Java track see the help page.

Source

This is an exercise to introduce users to using Exercism http://en.wikipedia.org/wiki/%22Hello,_world!%22_program

Submitting Incomplete Solutions

It's possible to submit an incomplete solution so you can see how others have completed the exercise.