Finding the next smaller and next larger prime number

Question

Hey all, will this code help me find the next larger and next smaller prime number? I only ask because my main() isnt outputting anything, but everything looks fine there. So assuming I may have done something that didnt make sense here.
          //returns the next larger prime number
          long largerGetter = num;
          long lG = num + 1;
          while(largerGetter != 1)
               largerGetter = PrimeChecker.primeOrNot(lG);
               lG++;
          nextLargerPrimeNumber = lG;
          //returns next smaller prime
          long smallerGetter = num;
          long sG = num - 1;
          while(smallerGetter != 1)
               smallerGetter = PrimeChecker.primeOrNot(sG);
               sG--;
          nextSmallerPrimeNumber = sG;

Answer 1

JimmyV88 wrote:
Hey all, will this code help me find the next larger and next smaller prime number? ...If this isn't homework (which it probably is), use the BigInteger class to find a [next probable prime|http://java.sun.com/j2se/1.5.0/docs/api/java/math/BigInteger.html#nextProbablePrime()] given a prime number or keep subtracting two from that given prime and check if that number is [(probable) prime|http://java.sun.com/j2se/1.5.0/docs/api/java/math/BigInteger.html#isProbablePrime(int)] to find the previous prime.