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Basic coding standards

• Be consistent
• Keep it simple
• Encourage loose coupling
• Encapsulate
• Don't reinvent the wheel, see if functionality is available via the standard library or other open-source frameworks, favoring dependencies we've already incorporated (i.e., the Jakarta Commons libraries, etc.)
• Don't repeat yourself
• Avoid code smells
• Optimize after profiling, but that doesn't mean you should write stupid code
• Keep an open mind, in both the sense of egoless programming, and an eye for better ways of doing things
• Get things done

Resources

• Writing testable code - an excellent collection of tips on how to structure and organize your code to make it easier to test (pdf)
• Joshua Bloch's book Effective Java is an excellent collection of tips that will help you become more fluent in Java.
• Bleeding at the keyboard
• Exception handling: http://www.onjava.com/pub/a/onjava/2003/11/19/exceptions.html - in general, make sure your error messages are concise and informative. Just like your code.
• http://www.artima.com is a good site for learning more about Java and programming in general.
• CACM article on good API design