Add JavaDocs, Overloading, and Return Types example code

Author: phrdang

src/com/codefortomorrow/intermediate/chapter11/examples/JavaDocs.java

@@ -0,0 +1,13 @@
+package com.codefortomorrow.intermediate.chapter11.examples;
+
+public class JavaDocs {
+    /**
+     * Returns the average of two doubles
+     * @param a  first double
+     * @param b  second double
+     * @return the average of two doubles
+     */
+    public static double average(double a, double b) {
+        return (a + b) / 2;
+    }
+}

src/com/codefortomorrow/intermediate/chapter11/examples/Overloading.java

@@ -0,0 +1,19 @@
+package com.codefortomorrow.intermediate.chapter11.examples;
+
+public class Overloading {
+    public static void main(String[] args) {
+        // call 2-arg sum
+        System.out.println(sum(2, 3)); // prints 5
+
+        // call 3-arg sum
+        System.out.println(sum(1, 4, 7)); // prints 12
+    }
+
+    public static int sum(int a, int b) {
+        return a + b;
+    }
+
+    public static int sum(int a, int b, int c) {
+        return sum(a, b) + c;
+    }
+}

src/com/codefortomorrow/intermediate/chapter11/examples/ReturnTypes.java

@@ -0,0 +1,17 @@
+package com.codefortomorrow.intermediate.chapter11.examples;
+
+public class ReturnTypes {
+    public static void main(String[] args) {
+        printSum(5, 4);
+        int myNumber = sum(5, 4) / 2;
+        System.out.println(myNumber);
+    }
+
+    public static void printSum(int a, int b) {
+        System.out.println(a + b);
+    }
+
+    public static int sum(int a, int b) {
+        return a + b;
+    }
+}