Implemented Abundant number

src/main/java/stringbasic/exercises/AbundantNumber.java

@@ -0,0 +1,27 @@
+package stringbasic.exercises;
+
+public class AbundantNumber {
+
+    private int number;
+
+    public AbundantNumber(int number) {
+        this.number = number;
+    }
+
+    public int abundance() {
+        int result = 0;
+        for (int i = 1; i <= Math.sqrt(this.number); i++) {
+            if (this.number % i == 0) {
+                result += i;
+                if (this.number / i != i)
+                    result += this.number / i;
+            }
+        }
+
+        return result - this.number;
+    }
+
+    public boolean isAbundant() {
+        return this.abundance() > this.number;
+    }
+}

src/test/java/stringbasic/exercises/AbundantNumberTest.java

@@ -0,0 +1,44 @@
+package stringbasic.exercises;
+
+import com.google.common.collect.ImmutableList;
+import org.junit.Assert;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
+import org.junit.runners.Parameterized.Parameters;
+
+import java.util.Collection;
+
+@RunWith(Parameterized.class)
+public class AbundantNumberTest {
+
+    private int number;
+    private int abundance;
+    private boolean isAbundant;
+
+    @Parameters
+    public static Collection<Object[]> abundantNumbers () {
+        return ImmutableList.of(
+                new Object[] {10, 8, false},
+                new Object[] {12, 16, true},
+                new Object[] {18, 21, true},
+                new Object[] {20, 22, true},
+                new Object[] {21, 11, false},
+                new Object[] {24, 36, true},
+                new Object[] {30, 42, true}
+        );
+    }
+
+    public AbundantNumberTest(int number, int abundance, boolean isAbundant) {
+        this.number = number;
+        this.abundance = abundance;
+        this.isAbundant = isAbundant;
+    }
+
+    @Test
+    public void testKnownCases() {
+        AbundantNumber sut = new AbundantNumber(this.number);
+        Assert.assertEquals("number: " + this.number, this.abundance, sut.abundance());
+        Assert.assertEquals("number: " + this.number, this.isAbundant, sut.isAbundant());
+    }
+}