addition of two binary numbers in java

1import java.util.Scanner;
2public class JavaExample {
3   public static void main(String[] args)
4   {	 
5	long b1, b2;
6	int i = 0, carry = 0;
7	int[] sum = new int[10];
8	Scanner scanner = new Scanner(System.in);
9	System.out.print("Enter first binary number: ");
10	b1 = scanner.nextLong();
11	System.out.print("Enter second binary number: ");
12	b2 = scanner.nextLong();
13	scanner.close();
14	while (b1 != 0 || b2 != 0) 
15	{
16		sum[i++] = (int)((b1 % 10 + b2 % 10 + carry) % 2);
17		carry = (int)((b1 % 10 + b2 % 10 + carry) / 2);
18		b1 = b1 / 10;
19		b2 = b2 / 10;
20	}
21	if (carry != 0) {
22		sum[i++] = carry;
23	}
24	--i;
25	System.out.print("Output: ");
26	while (i >= 0) {
27		System.out.print(sum[i--]);
28	}
29	System.out.print("\n");  
30   }
31}