All contributions must follow Java's standard code conventions. Failure to comply to these conventions will result in the denial of your contribution, regardless of the final functioning of the code.
Not a lot. Just DO NOT do stuff like this:
public void example()
{
System.out.println("bad code");
}
or this
System.out.println( getName( bad_code ) );
or this
public void AnotherBadExample() {}
These practices make your code harder to read and are very annoying.
Do THIS instead:
public void example() {
System.out.println("good code");
}
or this
System.out.println(getName(goodCode));
or this
public void anotherGoodExample() {}