• Improve maintainability
  1. Do not duplicate code : use function instead
  2. Minimize dependencies between classes

• Improve readability
  1. Write small functions : < 200 lines
  2. Use explicit class and variable names
  3. Use comments only when necessary : everyone should understand your code
  4. Improve class cohesion and coherence

see https://java.sun.com/docs/codeconv/html/CodeConvTOC.doc.html