Summary

Java Primitive Type Wrapper Classes

For every Java primitive data type there exists a corresponding Java wrapper class that can be used to add functionality to primitive types. The wrapper classes are found in the java.lang package. Table 6-5 lists the primitive types, their corresponding wrapper classes, and some methods of interest supplied by each wrapper class.

Table 6-5: Primitive Type Wrapper Classes

Primitive Type	Wrapper Class	Methods of Interest
char	Character	The Character class provides many class field constants and methods(). There are too many to list them all here. You’ve seen two Character static class methods in action in this chapter. They are isJavaIdentifierStart(char c), and isJavaIdentifierPart(char c). Other methods you may find immediately helpful include: toLowerCase(char c), toUpperCase(char c), and toTitleCase(char c). Take the time to look up this class in the Java platform API documentation.
byte	Byte	parseByte(String s), toString(byte b), longValue(), intValue(), shortValue(), doubleValue(), floatValue(), toString()
short	Short	parseShort(String s), intValue(), longValue(), byteValue(), doubleValue(), intValue(), floatValue(), toString()
long	Long	parseLong(String s), intValue(), shortValue(), byteValue(), doubleValue(), floatValue(), toString()
int	Integer	parseInt(String s), longValue(), floatValue(), shortValue(), byteValue(), doubleValue(), toString()
float	Float	parseFloat(String s), byteValue(), shortValue(), longValue(), intValue(), doubleValue(), toString()
double	Double	parseDouble(String s), floatValue(), byteValue(), shortValue(), longValue(), intValue(), toString()
boolean	Boolean	getBoolean(String name), toString(Boolean b), toString()