Here is my simple java solution

[chinmay-garg]

import java.math.BigInteger;
public class Solution {
public String addBinary(String A, String B) {
BigInteger a= new BigInteger(A,2);
BigInteger b= new BigInteger(B,2);
BigInteger c= a.add(b);
return c.toString(2);
}

}

[chirag-gupta_831]

can use explain what is use of 2 in new BigInteger(A,2) line