Added more switch examples

Shows switching on integers, strings, and enums.
Shows all cases with break, shows intentional fall-through, and shows
idiomatic uncommented fall-through for two identical cases.

src/main/java/edu/unl/cse/soft160/switches/IfSwitch.java

@@ -18,6 +18,7 @@ public class IfSwitch {
         System.out.println("You entered " + outputString + ".");
     }
 
+    // This version of convertToWord uses a chained conditional
     private static String convertToWord(int value) {
         String numberText;
         if (value == 1) {
@@ -33,6 +34,7 @@ public class IfSwitch {
     }
 
 /*
+    // This version of convertToWord uses a switch statement
     private static String convertToWord(int value) {
         String numberText;
         switch (value) {

src/main/java/edu/unl/cse/soft160/switches/SwitchExamples.java

+package edu.unl.cse.soft160.switches;
+
+public class SwitchExamples {
+    public enum Temperature {
+        SUMMER, AUTUMN, WINTER, SPRING
+    }
+
+    // This example shows that switch statements can be used with integers
+    // This example also shows the typical situation in which each case ends with break
+    public static String digitToWord(int value) {
+        String numberWord;
+        switch (value) {
+            case 1:
+                numberWord = "one";
+                break;
+            case 2:
+                numberWord = "two";
+                break;
+            case 3:
+                numberWord = "three";
+                break;
+            case 4:
+                numberWord = "four";
+                break;
+            case 5:
+                numberWord = "five";
+                break;
+            case 6:
+                numberWord = "six";
+                break;
+            case 7:
+                numberWord = "seven";
+                break;
+            case 8:
+                numberWord = "eight";
+                break;
+            case 9:
+                numberWord = "nine";
+                break;
+            case 10:
+                numberWord = "ten";
+                break;
+            default:    /* The default code should NOT be used for a normal case */
+                numberWord = "an out-of-range value";
+        }
+        return numberWord;
+    }
+
+    // This example shows that switch statements can be used with strings (in Java)
+    // This example also shows that you should add a "fall-through" comment when you intentionally omit a break
+    public static void findVehicleType(String vehicle) {
+        switch (vehicle) {
+            case "Silverado":
+                System.out.println("pickup truck");
+                break;
+            case "Traverse":
+                System.out.println("SUV");
+                break;
+            case "Corvette":        /* The "Corvette" case will output "fast car" */
+                System.out.print("fast ");
+                // fall-through
+            case "Cruze":
+                System.out.println("car");
+                break;
+            default:
+                System.out.println("unrecognized vehicle");
+        }
+    }
+
+    // This example shows that switch statements can be used with enumerated types
+    // This example also shows the idiom where it's okay not to add a "fall-through" comment
+    public static String getSeasonalTemperature(Temperature season) {
+        String seasonalTemperature;
+        switch (season) {
+            case SUMMER:
+                seasonalTemperature = "hot";
+                break;
+            case WINTER:
+                seasonalTemperature = "cold";
+                break;
+            case SPRING:            /* When two cases are identical, this is the idiom */
+            case AUTUMN:
+                seasonalTemperature = "warm";
+                break;
+            default:
+                seasonalTemperature = "indeterminate";
+        }
+        return seasonalTemperature;
+    }
+}