Decimal to Binary conversion

import java.util.Scanner;
class DecimalToBinary
{
    public static void main(String args[])
    {
        Scanner in = new Scanner(System.in);
        System.out.println("Enter a decimal number");
        int num = in.nextInt();
        
        String b = "";
        int t = num;
        while(t>0)
        {
            int r = t%2;
            t = t/2;
            b = r + b;
        }
        System.out.println("Binary Equivalent of " +num+ " is " +b);
    }
}