Rule 1:Prefer using enum to int constants
why use it?
1.Avoids redundancy:
-The Novice programmer, to use constansts common to class will write in all the classes same values, here enum comes to rescue with it’s huge features.
2.Type safety:
-enums complains at compile time if a TYPE other than expected is passed where as normal class will accept and will throw ClassCastException at run time.
3.loaded with other featues:
enum has a static method values which return all the constants,this feature is not provided in normal class int constants or enum patterns in class
4.more redability
-enums are immutable(no explicit access to constructor to set the values) by nature and provide better redability and verbosity than int constants or int enum patterns in class.
int-enum patterns
string-enum pattern
CONTANT-SPECIFIC BEHAVIOUR
CONSTANT-SPECIFIC DATA
the more is LOC the more boilerplate and more is chances of error.write precise error free code
usecase: sometimes a behaviour is associated with a constant like diet for the specific day of week,CONTANT-SPECIFIC BEHAVIOUR is used to implement it.
–>when there is some commonality in behavious of some but not all Contstants use strategy enum.
Techglot 