Chapter 18, Problem 2RE

Explanation of Solution

Difference between generic class and ordinary class:

Generic class	Ordinary class
The type variable of the generic class is shown by a type variable description in angle bracket.	The type variables of the ordinary class are written normally without specifying in inside the angle bracket.
By conventions, the type of the generic class are usually single uppercase letters like, “T”, “S”, “K”, “V” and so on.	The type of ordinary classes are the original primitive types, “int”, “String”, “double” and so on...