Describe the wrapper classes in Java.  

one for each primitive type: Boolean, Byte, Character, Double, Float, Integer, Long, and Short
Byte, Double, Float, Integer and Short extend the abstract Number class
all are public final ie cannot be extended
get around limitations of primitive types
allow objects to be created from primitive types

Answered by Chaitanya , an ibibo Advisor, at 12:02 PM on June 26, 2009

Wrapper class is wrapper around a primitive data type. An instance of a wrapper class contains, or wraps, a primitive value of the corresponding type.

Following table lists the primitive types and the corresponding wrapper classes:

Primitive


Wr apper

boolean


java.lang.Boolean

byte


java.lang.Byte

char


java.lang.Character

double


java.lang.Double

float


java.lang.Float

int


java.lang.Integer

long


java.lang.Long

short


java.lang.Short

void


java.lang.Void

Answered by Nishu%27s , an ibibo Master, at 7:20 PM on November 16, 2008

Wrapper class is wrapper around a primitive data type. An instance of a wrapper class contains, or wraps, a primitive value of the corresponding type.CNOUG博客首页Y$KL2v"P;IO~y

Following table lists the primitive types and the corresponding wrapper classes:

Primitive Wrapper
bool ean java.lang.Boolean
byte java.lang.Byte
char java.lang.Character
double java.lang.Double
float java.lang.Float
int java.lang.Integer
long java.lang.Long
short java.lang.Short
void java.lang.Void

Answered by Suparna , an ibibo Master, at 11:21 PM on November 14, 2008