Added exercise prime-factors

config.json

@@ -19,7 +19,8 @@
     "triangle",
     "scrabble-score",
     "roman-numerals",
-    "binary"
+    "binary",
+    "prime-factors"
   ],
   "deprecated": [
   ],

prime-factors/build.gradle

@@ -0,0 +1,11 @@
+apply plugin: "java"
+apply plugin: "eclipse"
+apply plugin: "idea"
+
+repositories {
+  mavenCentral()
+}
+
+dependencies {
+  testCompile "junit:junit:4.10"
+}

prime-factors/example.java

@@ -0,0 +1,21 @@
+import java.util.ArrayList;
+import java.util.List;
+
+public class PrimeFactors {
+
+    public static List<Integer> getForNumber(double number) {
+        List<Integer> primes = new ArrayList<>();
+        int divisor = 2;
+
+        while (number > 1) {
+            while (number % divisor == 0) {
+                primes.add(divisor);
+                number /= divisor;
+            }
+
+            divisor++;
+        }
+
+        return primes;
+    }
+}

prime-factors/src/main/java/PrimeFactors.java

@@ -0,0 +1,2 @@
+public class PrimeFactors {
+}

prime-factors/src/test/java/PrimeFactorsTest.java

@@ -0,0 +1,44 @@
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
+import org.junit.runners.Parameterized.Parameters;
+
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.List;
+
+import static org.junit.Assert.assertEquals;
+
+@RunWith(Parameterized.class)
+public class PrimeFactorsTest {
+
+    private double input;
+    private List<Integer> expectedOutput;
+
+    @Parameters
+    public static Collection<Object[]> data() {
+        return Arrays.asList(new Object[][]{
+                {1, Arrays.asList(new Integer[0])},
+                {2, Arrays.asList(new Integer[]{2})},
+                {3, Arrays.asList(new Integer[]{3})},
+                {4, Arrays.asList(new Integer[]{2, 2})},
+                {6, Arrays.asList(new Integer[]{2, 3})},
+                {8, Arrays.asList(new Integer[]{2, 2, 2})},
+                {9, Arrays.asList(new Integer[]{3, 3})},
+                {27, Arrays.asList(new Integer[]{3, 3, 3})},
+                {625, Arrays.asList(new Integer[]{5, 5, 5, 5})},
+                {901255, Arrays.asList(new Integer[]{5, 17, 23, 461})},
+                {93819012551L, Arrays.asList(new Integer[]{11, 9539, 894119})}
+        });
+    }
+
+    public PrimeFactorsTest(double input, List<Integer> expectedOutput) {
+        this.input = input;
+        this.expectedOutput = expectedOutput;
+    }
+
+    @Test
+    public void test() {
+        assertEquals(expectedOutput, PrimeFactors.getForNumber(input));
+    }
+}