Converting from Integer, to BigInteger

问题:

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.

回答1:

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.

回答2:

You can do in this way:

    Integer i = 1;
    new BigInteger("" + i);