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- public class PerfectNumber {
- private boolean isPerfectNumber(int number, int current, int sum) {
- if (number <= 2) {
- return false;
- }
- if (current == 1) {
- return ++sum == number;
- }
- if (number % current == 0) {
- return isPerfectNumber(number, current - 1, sum + current);
- } else {
- return isPerfectNumber(number, current - 1, sum);
- }
- }
- public boolean perfectNumber(int n) {
- return isPerfectNumber(n, n / 2, 0);
- }
- public static void main(String[] args) {
- PerfectNumber pNumber = new PerfectNumber();
- for (int i = 1; i < 10000; i++) {
- if (pNumber.perfectNumber(i)) {
- System.out.println(i + " is a perfect number!");
- }
- }
- }
- }
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