How to find prime numbers in java?

Source:

public class PrimeNumbers {

   public static void main(String args[]) {
      for(int x = 2; x < 50; x++) {
         if(isPrime(x)){
            System.out.print(x +", ");
         }
      }
   }

   public static boolean isPrime(int x) {
      for(int i=2; i<x; i++) {
         if(x % i == 0) {
            return false; 
         }
      }
      return true; 
   }
}

Output:

   $ java PrimeNumbers 
   2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47,