Wrapper class in java

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

example:

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); 
}}