Topic 5 of 12

Object Calisthenics

Nine exercise rules (proposed by Jeff Bay) that push you toward better object-oriented design. Not always to be followed to the letter — but great for practice.

What to study

Only one level of indentation per method
Don't use ELSE
Wrap all primitives
First-class collections
One dot per line
Don't abbreviate
Small classes (max. 50 lines)
At most 2 instance variables per class
No getters / setters

What to study

Videos5