Added Exercise 009 - Positive Difference

Author: trantbatey

src/Java101ExerciseTest.java

@@ -99,6 +99,16 @@ public void exercise008Test() {
                 Java101Exercises.cube008(-5), 0.000001);
     }
 
+    @Test
+    public void exercise009Test() {
+        assertEquals("Java101Exercises.calcPositiveDifference009(4, 10) failed", 6,
+                Java101Exercises.calcPositiveDifference009(4, 10));
+        assertEquals("Java101Exercises.calcPositiveDifference009(-2, 17) failed", 19,
+                Java101Exercises.calcPositiveDifference009(-2, 17));
+        assertEquals("Java101Exercises.calcPositiveDifference009(-5, -28) failed", 23,
+                Java101Exercises.calcPositiveDifference009(-5, -28));
+    }
+
     @Test
     public void exercise011Test() {
         assertEquals("exercise011Test failed test 01.",7.0, Java101Exercises.preformIndicatedOperation011("ADD",3, 4), 0.00001);

src/Java101Exercises.java

@@ -126,8 +126,8 @@ public static boolean isEqual006(int a, int b) {
      *
      * LEVEL: BASIC
      *
-     * @param a     First integer
-     * @param b     Second integer
+     * @param a     First double
+     * @param b     Second double
      * @return      Boolean flag reflecting equality
      */
     public static boolean isGreaterThan007(double a, double b) {
@@ -147,6 +147,21 @@ public static double cube008(double a) {
         return 0.0;
     }
 
+    /**
+     * Exercise 009 - Positive Difference
+     * Write a method that accepts two integers and returns the positive difference between the two numbers.
+     *
+     * LEVEL: BASIC
+     *
+     * @param a     First integer
+     * @param b     Second integer
+     * @return      Boolean flag reflecting equality
+     */
+    public static int calcPositiveDifference009(int a, int b) {
+        // TODO: Write code here
+        return 0;
+    }
+
     /**
      * Exercise 011 - Preform Indicate Operation
      * Write a method with 3 parameters; a String and 2 doubles. The string will be an operation that the operation