Chapter2 - Encapsulation

Question 1

PRIMITIVE OBSESSION antipattern

Answer 1

tendency to use primitive types to represent other abstractions

Question 2

enum types + 2 methods

Answer 2

• class declaration where identifiers are globally available constants

–METHODS–

• ordinal(): gives position (int) of enum constant
• values(): an array of enum type containing all enum constants

Question 3

INNAPROPRIATE INTIMACY antipattern

Answer 3

pair of classes that are too tightly coupled - they use a significant number of method and fields of the other

Question 4

immutable objects

Answer 4

their class provides no way to change the internal state of the object after initialization (eg. String)

Question 5

2 methods for exposing internal information

Answer 5

1. returning a copy of the object using a copy constructor
2. using unmodifiable view collections (Collections.unmodifiableList(list)) - returns an unmodifiable wrapper around a list.

Question 6

defensive programming

Answer 6

when corner cases are checked for everywhere in the code