Add example code for Method Calls, Variable Scope, and Parameters

Author: phrdang

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

@@ -0,0 +1,11 @@
+package com.codefortomorrow.intermediate.chapter11.examples;
+
+public class MethodCalls {
+    public static void main(String[] args) {
+        sum(5, 4);
+    }
+
+    public static void sum(int a, int b) {
+        System.out.println(a + b);
+    }   
+}

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

@@ -0,0 +1,28 @@
+package com.codefortomorrow.intermediate.chapter11.examples;
+
+public class Parameters {
+    public static void main(String[] args) {
+        // scoopIceCream with 1 parameter
+        scoopIceCream("chocolate");
+        scoopIceCream("vanilla");
+        scoopIceCream("strawberry");
+
+        // scoopIceCream with multiple parameters
+        scoopIceCream("chocolate", true);
+        scoopIceCream("vanilla", false);
+        scoopIceCream("strawberry", true);
+    }
+
+    public static void scoopIceCream(String flavor) {
+        System.out.println("Here's a scoop of " + flavor + " ice cream!");
+    }
+
+    public static void scoopIceCream(String flavor, boolean wantCone) {
+        if (wantCone) {
+            System.out.println("Here's a scoop of " + flavor + 
+                " ice cream on a cone!");
+        } else {
+            System.out.println("Here's a scoop of " + flavor + " ice cream!");
+        }
+    }
+}

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

@@ -0,0 +1,20 @@
+package com.codefortomorrow.intermediate.chapter11.examples;
+
+public class VariableScope {
+    public static void main(String[] args) {
+        method1(); // prints 5.0
+        method2(); // prints 2.0
+        // System.out.println(a);  throws an exception
+    }
+
+    public static void method1() {
+        double a = 5;
+        System.out.println(a);
+    }
+
+    public static void method2() {
+        // both variables are called a
+        double a = 2;
+        System.out.println(a);
+    }
+}