[Java programming ] Generic

[ Generic ]

: 클래스 내부에서 지정하는 것이 아닌 외부에서 사용자에 의해 지정되는 것. 

: 컬렉션 프레임 워크에서 많이 사용되어짐 

-       Generics add that type of safety feature.

-       Generics are used in HashSet / ArrayList / HashMap

 

-       The syntax of generic 

* To create an instance of generic class

* BaseType <Type> obj = new BaseType <Type>()

* We cannot use primitive data types like int, char

-       Type Parameters in Java Generics

-> T : Type

-> E : Element

-> K : Key

-> N: Number

-> V : Value

 

-   Advantages of Generics

: Programs that use generics has got many benefits over non-generic codes.

ð Code Reuse / Type Safety