Java Program To converting a decimal to binary and back to decimal

package logics;

public class decimalToBinary {
    public static void main(String []a)
    {
       
        convert(3);
    }

public static void convert(int dec)
{

    int barray[]=new int[32];
    int index=0;
    while(dec>0)
    {
        barray[index++]=dec%2;
        dec=dec/2;
    }
    System.out.println("binary equivalant is");
    for(int i=barray.length-1;i>=0;i--)
    {
        System.out.print(barray[i]);
    }
    /* converting again into decimal*/
    System.out.println("\nDecimal equivalant is");

    int sum=0;
    int pow=0;
    for(int i=0;i<barray.length-1;i++)
    {
       
        sum=sum+(barray[i]*(int)Math.pow(2.0,pow ));

        pow=pow+1;
    }
    System.out.print(sum);
   
}
}//class

output:
--------------------------
binary equivalant is
00000000000000000000000000000011
Decimal equivalant is
3