Chap 21, Ex: 09

Author: HarryDulaney

ch_08/Exercise08_37.java

@@ -31,7 +31,7 @@ public static void main(String[] args) {
                 {"Michigan", "Lansing"}, {"Minnesota", "Saint Paul"},
                 {"Mississippi", "Jackson"}, {"Missouri", "Jefferson City"},
                 {"Montana", "Helena"}, {"Nebraska", "Lincoln"},
-                {"Nevada	", "Carson City"}, {"New Hampshire", "Concord"},
+                {"Nevada", "Carson City"}, {"New Hampshire", "Concord"},
                 {"New Jersey", "Trenton"}, {"New Mexico", "Santa Fe"},
                 {"New York", "Albany"}, {"North Carolina", "Raleigh"},
                 {"North Dakota", "Bismarck"}, {"Ohio", "Columbus"},

ch_20/Exercise20_02.java

@@ -86,7 +86,6 @@ public void start(Stage primaryStage) {
         primaryStage.setScene(scene);
         primaryStage.show();
 
-
     }
 
     private void refreshUI(LinkedList<Integer> numbers) {

ch_21/Exercise21_09.java

@@ -0,0 +1,61 @@
+package ch_21;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Scanner;
+
+/**
+ * *21.9 (Guess the capitals using maps) Rewrite Programming Exercise 8.37 to store
+ * pairs of each state and its capital in a map. Your program should prompt the user
+ * to enter a state and should display the capital for the state.
+ * <p>
+ * {@linkplain ch_08.Exercise08_37}
+ */
+public class Exercise21_09 {
+    public static void main(String[] args) {
+        String[][] statesAndCaptials = {
+                {"Alabama", "Montgomery"}, {"Alaska", "Juneau"}, {"Arizona", "Phoenix"},
+                {"Arkansas", "Little Rock"}, {"California", "Sacramento"},
+                {"Colorado", "Denver"}, {"Connecticut", "Hartford"},
+                {"Delaware", "Dover"}, {"Florida", "Tallahassee"},
+                {"Georgia", "Atlanta"}, {"Hawaii", "Honolulu"}, {"Idaho", "Boise"},
+                {"Illinois", "Springfield"}, {"Indiana", "Indianapolis"},
+                {"Iowa Des", "Moines"}, {"Kansas", "Topeka"}, {"Kentucky", "Frankfort"},
+                {"Louisiana", "Baton Rouge"}, {"Maine", "Augusta"},
+                {"Maryland", "Annapolis"}, {"Massachusetts", "Boston"},
+                {"Michigan", "Lansing"}, {"Minnesota", "Saint Paul"},
+                {"Mississippi", "Jackson"}, {"Missouri", "Jefferson City"},
+                {"Montana", "Helena"}, {"Nebraska", "Lincoln"},
+                {"Nevada", "Carson City"}, {"New Hampshire", "Concord"},
+                {"New Jersey", "Trenton"}, {"New Mexico", "Santa Fe"},
+                {"New York", "Albany"}, {"North Carolina", "Raleigh"},
+                {"North Dakota", "Bismarck"}, {"Ohio", "Columbus"},
+                {"Oklahoma", "Oklahoma City"}, {"Oregon", "Salem"},
+                {"Pennsylvania", "Harrisburg"}, {"Rhode Island", "Providence"},
+                {"South Carolina", "Columbia"}, {"South Dakota", "Pierre"},
+                {"Tennessee", "Nashville"}, {"Texas", "Austin"},
+                {"Utah", "Salt Lake City"}, {"Vermont", "Montpelier"},
+                {"Virginia", "Richmond"}, {"Washington", "Olympia"},
+                {"West Virginia", "Charleston"}, {"Wisconsin", "Madison"},
+                {"Wyoming", "Cheyenne"}
+        };
+
+        Map<String, String> stateCapitalsMap = new HashMap<>();
+        for (String[] pair : statesAndCaptials) {
+            stateCapitalsMap.putIfAbsent(pair[0], pair[1]);
+        }
+
+        Scanner in = new Scanner(System.in);
+        System.out.print("Enter a state: ");
+        String userInput = in.nextLine().trim();
+
+        if (stateCapitalsMap.containsKey(userInput)) {
+            System.out.println("The capital of " + userInput + " is " + stateCapitalsMap.get(userInput));
+        } else {
+            System.out.println("We could not find a capital for the state: " + userInput);
+        }
+
+        in.close();
+    }
+
+}