How to add two numbers of any length in java?

Question

How to add two numbers of any length in java?

Say for example, in java long size is 64 bit. So the maximum range is -9223372036854775808 to 9223372036854775807. Am i

Answer 1

You can use a BigInteger.

BigInteger a = new BigInteger("9223372036854775807");
BigInteger b = new BigInteger("9223372036854775808");
BigInteger result = a.add(b);

The BigInteger will let you work with numbers of any size, but you lose a considerable amount of performance over long or int.