[Sync Iteration] java/perfect-numbers/1

solutions/java/perfect-numbers/1/src/main/java/Classification.java

@@ -0,0 +1,5 @@
+enum Classification {
+
+    DEFICIENT, PERFECT, ABUNDANT
+
+}

solutions/java/perfect-numbers/1/src/main/java/NaturalNumber.java

@@ -0,0 +1,46 @@
+import java.util.HashSet;
+import java.util.Set;
+
+class NaturalNumber {
+    private final int number;
+    private final Set<Integer> primes = new HashSet<>();
+
+    NaturalNumber(final int number) {
+        if (number <= 0) {
+            throw new IllegalArgumentException("You must supply a natural number (positive integer)");
+        }
+
+        this.number = number;
+
+        for (int i = 1; i <= number / 2; ++i) {
+            if (number % i == 0) {
+                this.primes.add(i);
+                if (i == 1) {
+                    continue;
+                }
+                this.primes.add(number / i);
+            }
+        }
+    }
+
+    Classification getClassification() {
+        if (this.primes.size() == 1) {
+            return Classification.DEFICIENT;
+        }
+
+        int sum = 0;
+        for (int num : this.primes) {
+            sum += num;
+        }
+
+        if (sum == this.number) {
+            return Classification.PERFECT;
+        }
+
+        if (sum > this.number) {
+            return Classification.ABUNDANT;
+        }
+
+        return Classification.DEFICIENT;
+    }
+}