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- /* Naive prime number filter
- * Inspired by Unix pipes, though these short circuit as soon as they detect a non-prime
- */
- package primenumberfilterchain;
- public class PrimeNumberFilterChain {
- public static void main(String[] args) {
- int MAX_NUMBER = 10000;
- Filter filter = new Filter(1); // not prime, but we need to start with something
- for (int i = 2; i <= MAX_NUMBER; i++) { //Note we start from 2, the first prime
- if (filter.isPrime(i)) {
- System.out.println(i);
- }
- }
- }
- }
- class Filter {
- int myMultiple;
- Filter nextFilter;
- Filter(int number) {
- myMultiple = number;
- nextFilter = null;
- }
- boolean isPrime(int number) {
- if (myMultiple > 1 && (number % myMultiple == 0)) {
- return false;
- } else if (nextFilter != null) {
- return nextFilter.isPrime(number);
- } else {
- nextFilter = new Filter(number);
- return true;
- }
- }
- }
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