Java.math.biginteger

Question

Ol�, estou com problema na seguinte linha de c�digo:
int novocod_cid = ((Integer)maxCidade.getValue("MAXCID_COD")).intValue();
Ela esta no tutorial e apresenta uma mensagem de erro:
lava.math.biginteger

Answer 1

For anyone interested, it could be fun to get some feedback on my implementationI've modified your code: class FermatPrime {
    public static boolean doTest (BigInteger p, int prob) {
        for (int c = 0; c < prob; c++) {
            if (!doModPow(p)) {
                return false;
        return true;
    public static boolean doModPow (BigInteger n) {
        long rndnum = 1 + generator.nextInt(99);
        BigInteger b = BigInteger.valueOf(rndnum);
        return b.modPow((n.subtract(n.ONE)), n).equals(n.ONE);
}Of the four changes I've made, one fixes a bug and three clean up the implementation. I've left the distribution of rndnum alone, but I do think that it's somewhat imperfect. Firstly, if rndnum happens to be 1 the test is absolutely pointless; secondly, the range is rather small. If you are going to have such a small range, you should take steps to ensure that you don't use the same number in multiple tests.