Converting from Integer, to BigInteger

Question

Hello, I was wondering if there was any way to convert a variable of type Integer, to BigInteger. I tried typecasting the Integer variable, but i get an error that says inconvertible type.

Answer 1

You can use the String constructor from BigInteger like so:

int regularInt = 321312; // some value
BigInteger bigInt = new BigInteger(String.valueOf(regularInt));

Answer 2

Use the BigInteger constructor that takes a string:

int intValue = 123;
BigInteger bigIntValue = new BigInteger(Integer.toString(intValue));

Answer 3

The method you want is BigInteger#valueOf(long val).

E.g.,

BigInteger bi = BigInteger.valueOf(myInteger.intValue());

Making a String first is unnecessary and undesired.