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Java : Wrapper class

Tutorial by:Arena Buocel      Date: 2016-04-30 00:17:44

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Wrapper class in java provides the mechanism to convert primitive into object and object into primitive.

Since J2SE 5.0, autoboxing and unboxing feature converts primitive into object and object into primitive automatically. The automatic conversion of primitive into object is known and autoboxing and vice-versa unboxing.

One of the eight classes of java.lang package are known as wrapper class in java. The list of eight wrapper classes are given below:

Primitive Type

Wrapper class

boolean

Boolean

char

Character

byte

Byte

short

Short

int

Integer

long

Long

float

Float

double

Double

Wrapper class Example: Primitive to Wrapper

public class WrapperExample1{  

public static void main(String args[]){  

//Converting int into Integer  

int a=20;  

Integer i=Integer.valueOf(a);//converting int into Integer  

Integer j=a;//autoboxing, now compiler will write Integer.valueOf(a) internally  

  

System.out.println(a+" "+i+" "+j);  

}}  

Output:

20 20 20

Wrapper class Example: Wrapper to Primitive

public class WrapperExample2{    

public static void main(String args[]){    

//Converting Integer to int    

Integer a=new Integer(3);    

int i=a.intValue();//converting Integer to int  

int j=a;//unboxing, now compiler will write a.intValue() internally    

    

System.out.println(a+" "+i+" "+j);    

}}    

Output:

3 3 3

 

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