转：java中各种数据类型的默认值

The following chart summarizes the default values for the above data types.

Data Type	Default Value (for fields)
byte	0
short	0
int	0
long	0L
float	0.0f
double	0.0d
char	'\u0000'
String (or any object)	null
boolean	false

转自：http://java.sun.com/docs/books/tutorial/java/nutsandbolts/datatypes.html