1. Don't declare `throws Exception` unless you have to.
2. Don't use import java.xxxx.*; Only import the things you need, in this case: None.
3. In Java, braces goes at the same line and not on their own lines.
4. `class HelloWorld` should be `public class HelloWorld`
5. [tag:minor-stylistic-thing] Don't use a space between `main` and `(` (very very minor)