I assume you are wanting suggestions for an IDE. The most commonly used IDEs in business are Eclipse (Eclipse - The Eclipse Foundation open source community website.
) and Netbeans (Welcome to NetBeans
). I know Eclipse will help you as you code (such as suggesting methods to use), and I think Netbeans does also.
If you were wanting an IDE that will provide you with a lot of help, I would suggest Eclipse.
However, if you want an IDE that will leave you entirely alone while you code and provide you with no recommendations or assistance, I would suggest JCreator (http://www.jcreator.com/
All of these IDEs are Free.