Some of these tips are taken from the Java Developers Connection (JDC) mailing list by Sun Microsystems

• Abstract Classes vs. Interfaces
• Loading Text Files in Swing Efficiently

• J2ME and MIDP
• MIDlet Packaging with J2ME

All codes are provided as is

• Connect-4 game
  Implemented by: Will Knight (Computer Science Dept, Cardiff University)
  Full source code available. Code uses RMI to set up a client
  server interaction. See Readme.txt for details on compiling and
  running the code

• QARE
  QARE2.0 is an experimental platform for web services which builds on a delegation trust model. Using QARE, a web has full control over access privileges, licences can be managed by services subscribers (via delegation), and users are given capabilities, which define the various services they have access to.