what are the wrapper class and what is their purpose in java???

Wrapper classes: Every primitive type has a corresponding class defined in the Java API class

library. This class is sometimes called a wrapper class. These classes are mostly used for parsing of some string into primitive data type.(primitive data type=int,float,char,double,long,byte,short,boolean)

listed below are data type and their wrapper classes.

Primitive Type                           Wrapper Class

int                                                 Integer

short                                             Short

long                                              Long

byte                                              Byte

float                                             Float

double                                         Double

char                                           Character

Boolean                                     Boolean