In essence, these classes encapsulate, or wrap, the simple types within a class. Thus, they are commonly referred to as type wrappers. Number Abstract class. Defines a superclass that is implemented by the classes that wrap numeric types byte, short, int, long, float, and double. Six concrete subclasses.
Number has abstartct methods that return the value of the object of different numeric formats.
These methods may involve rounding up and truncation. 4cc0 Character Character is a simple wrapper around a char. 5 is a digit. A is a letter. A is uppercase. is whitespace.