Java™ Phrasebook

7. Numbers

Working with numbers in Java is a subject that every programmer should become proficient in, as nearly every program deals with numbers of one form or another. In this chapter, we primarily use the basic numeric Java types, their object wrappers, and the java.lang.Math class.

Table 7.1 summarizes the built-in types that Java offers and lists their wrapper objects available. Note that the boolean type does not have a bit size because it can contain only two discrete values, a value of true or false.

Table 7.1. Java’s Built-In Types

Type	Size in bits	Wrapper Object
byte	8	Byte
short	16	Short
int	32	Integer
long	64	Long
float	32	Float
double	64	Double
char	16	Character
boolean	--	Boolean

The object wrapper classes are useful when you want to treat a basic type ...