[Java] The Primitive Type & Wrapper

时间：2010-09-13 来源：web_surf

Package
The package for wrapper is java.lang.
Wrapper Objective
- Transform primitive type to/from string
- Defined some useful constants for primitive type
- Defined some useful methods for primitive type
Number
It is the parent class of wrapper classes.
boolean & Boolean (ture or false)
byte & Byte (8-bit)
short & Short (16-bit)
int & Integer (32-bit)
long & Long (64-bit)
float & Float (32-bit)
double & Double (64-bit)
char & Character (16-bit Unicode character)
void & Void
Others
- java.math.BigInteger & java.math.BigDecimal
  Defined useful math's methods for big(large) integer/decimal, such as abs, sin, cos, log, random, round.
- Buffer
  Defined in package java.nio, it is used to handle a buffer of data.
  1. ByteBuffer
  2. ShortBuffer
  3. IntBufer
  4. LongBuffer
  5. CharBuffer
  6. FloatBuffer
  7. DoubleBuffer
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