sum-of-multiples: use instance method instead of static method

Fixes issue #355.

exercises/sum-of-multiples/src/example/java/SumOfMultiples.java

@@ -1,26 +1,34 @@
 public class SumOfMultiples {
-    
-    
-    public static int sum(int number, int[] set) {
-        
+    private final int sum;
+
+    public SumOfMultiples(int number, int[] set) {
+        sum = calculateSum(number, set);
+    }
+
+    public int getSum() {
+        return sum;
+    }
+
+    private int calculateSum(int number, int[] set) {
+
         int sum = 0;
         int count = 0;
-        
+
         for (int i = 1; i < number; i++) {
-            
+
             for (int j = 0; j < set.length; j++) {
                 if (i % set[j] == 0) {
                     count++;
                 }
             }
-            
+
             if (count > 0) {
                 sum = sum + i;
                 count = 0;
             }
         }
-        
+
         return sum;
     }
-    
+
 }

exercises/sum-of-multiples/src/test/java/SumOfMultiplesTest.java

@@ -1,175 +1,160 @@
-import static org.junit.Assert.*;
-
 import org.junit.Ignore;
 import org.junit.Test;
 
+import static org.junit.Assert.*;
+
 public class SumOfMultiplesTest {
-    
-    
+
     @Test
     public void testSumOfMultiplesOf3and4UpToOne() {
-        
+
         int[] set = {
-            3,
-            5
+                3,
+                5
         };
-        int output = SumOfMultiples.sum(1, set);
+        int output = new SumOfMultiples(1, set).getSum();
         assertEquals(0, output);
-        
+
     }
-    
-    
+
     @Test
     @Ignore
     public void testSumOfMultiplesOf3and5UpToFour() {
-        
+
         int[] set = {
-            3,
-            5
+                3,
+                5
         };
-        int output = SumOfMultiples.sum(4, set);
+        int output = new SumOfMultiples(4, set).getSum();
         assertEquals(3, output);
-        
+
     }
-    
-    
+
     @Test
     @Ignore
     public void testSumOfMultiplesOf3and5UpToTen() {
-        
+
         int[] set = {
-            3,
-            5
+                3,
+                5
         };
-        int output = SumOfMultiples.sum(10, set);
+        int output = new SumOfMultiples(10, set).getSum();
         assertEquals(23, output);
-        
+
     }
-    
-    
+
     @Test
     @Ignore
     public void testSumOfMultiplesOf3and5UpToOneHundred() {
-        
+
         int[] set = {
-            3,
-            5
+                3,
+                5
         };
-        int output = SumOfMultiples.sum(100, set);
+        int output = new SumOfMultiples(100, set).getSum();
         assertEquals(2318, output);
-        
+
     }
-    
-    
+
     @Test
     @Ignore
     public void testSumOfMultiplesOf3and5UpToOneThousand() {
-        
+
         int[] set = {
-            3,
-            5
+                3,
+                5
         };
-        int output = SumOfMultiples.sum(1000, set);
+        int output = new SumOfMultiples(1000, set).getSum();
         assertEquals(233168, output);
-        
+
     }
-    
-    
+
     @Test
     @Ignore
     public void testSumOfMultiplesOf7and13and17UpToTwenty() {
-        
+
         int[] set = {
-            7,
-            13,
-            17
+                7,
+                13,
+                17
         };
-        int output = SumOfMultiples.sum(20, set);
+        int output = new SumOfMultiples(20, set).getSum();
         assertEquals(51, output);
-        
+
     }
-    
-    
+
     @Test
     @Ignore
     public void testSumOfMultiplesOf4and6UpToFifteen() {
-        
+
         int[] set = {
-            4,
-            6
+                4,
+                6
         };
-        int output = SumOfMultiples.sum(15, set);
+        int output = new SumOfMultiples(15, set).getSum();
         assertEquals(30, output);
-        
+
     }
-    
-    
+
     @Test
     @Ignore
     public void testSumOfMultiplesOf5and6and8UpToOneHundredFifty() {
-        
+
         int[] set = {
-            5,
-            6,
-            8
+                5,
+                6,
+                8
         };
-        int output = SumOfMultiples.sum(150, set);
+        int output = new SumOfMultiples(150, set).getSum();
         assertEquals(4419, output);
-        
+
     }
-    
-    
+
     @Test
     @Ignore
     public void testSumOfMultiplesOf5and25UpToTwoHundredSeventyFive() {
-        
+
         int[] set = {
-            5,
-            25
+                5,
+                25
         };
-        int output = SumOfMultiples.sum(51, set);
+        int output = new SumOfMultiples(51, set).getSum();
         assertEquals(275, output);
-        
+
     }
-    
-    
+
     @Test
     @Ignore
     public void testSumOfMultiplesOf43and47UpToTenThousand() {
-        
+
         int[] set = {
-            43,
-            47
+                43,
+                47
         };
-        int output = SumOfMultiples.sum(10000, set);
+        int output = new SumOfMultiples(10000, set).getSum();
         assertEquals(2203160, output);
-        
+
     }
-    
-    
+
     @Test
     @Ignore
     public void testSumOfMultiplesOfOneUpToOneHundred() {
-        
+
         int[] set = {
-            1
+                1
         };
-        int output = SumOfMultiples.sum(100, set);
+        int output = new SumOfMultiples(100, set).getSum();
         assertEquals(4950, output);
-        
+
     }
-    
-    
+
     @Test
     @Ignore
     public void testSumOfMultiplesOfNoneUpToTenThousand() {
-        
+
         int[] set = {};
-        int output = SumOfMultiples.sum(10000, set);
+        int output = new SumOfMultiples(10000, set).getSum();
         assertEquals(0, output);
-        
+
     }
-    
-    
-    
 }