Java Native

Primitive

• Primitive?
  • 원시 자료형이란 뜻으로 과학에서 프로그래밍 언어가 제공하는 자료형 중 하나. 내장형 혹은 기본형으로도 불림
  • wiki
• Java Primitive Type
  • byte, char, short, int, long, float, double, boolean

int casting

FROM	TO	METHOD	EX.
int	byte	-
int	char	char c = (char) int;
int	short	-
int	long	long l = int; Long l = new Long(int); Long l = Long.valueOf(int);
int	float	-
int	double	double d = int; Double d = new Double(int ); Double d = Double.valueOf(int);
int	boolean	-
int	string	String s = String.valueOf(int); String s = Integer.toString(int);

long casting

FROM	TO	METHOD	EX.
long	byte	-
long	char	-
long	short	-
long	int	int i = (int) long; int i = wrapperLong.intValue();
long	float	-
long	double	-
long	boolean	-
long	string	String s = String.valueOf(long); String s = Long.toString(long);

float casting

FROM	TO	METHOD	EX.
float	byte	-
float	char	-
float	short	-
float	int	-
float	long	-
float	double	-
float	boolean	-
float	string	-

double casting

FROM	TO	METHOD	EX.
double	byte	-
double	char	-
double	short	-
double	int	-
double	long	-
double	float	-
double	boolean	-
double	string	-

boolean casting

FROM	TO	METHOD	EX.
boolean	byte	-
boolean	char	-
boolean	short	-
boolean	int	-
boolean	long	-
boolean	float	-
boolean	long	-
boolean	string	-

String

StringPool

StringBuilder & StringBuffer

StringTokenizer

Enum

Object

Objects

Math

Math & Random

Date

Date & Calendar & Timestamp & UTC

Format

Regex

정규식(Regular Expression)