Wednesday, 18 January 2017

Chapter 21 Exercise 9, Introduction to Java Programming, Tenth Edition Y. Daniel LiangY.

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.

import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;

public class Exercise_09 {

    static int correctCount = 0;

    public static void main(String[] args) {

        Map<String, String> mapStateCapitals = new HashMap<>(50);
        for (String[] stateCapital : stateCapitals) {
            mapStateCapitals.put(stateCapital[0], stateCapital[1]);

        Scanner input = new Scanner(;
        mapStateCapitals.forEach((state, city) -> {
            System.out.print("What is the capital of " + state+"? ");
            if (input.nextLine().trim().equalsIgnoreCase(city)) {
                System.out.println("Your answer is correct!");
            } else {
                System.out.println("WRONG - The correct answer is " + city);

        System.out.println(" Score = " + correctCount + " out of");

    private static String[][] stateCapitals = {
            {"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"},
            {"Maryland", "Annapolis"},
            {"Minnesota", "Saint Paul"},
            {"Iowa", "Des Moines"},
            {"Maine", "Augusta"},
            {"Kentucky", "Frankfort"},
            {"Indiana", "Indianapolis"},
            {"Kansas", "Topeka"},
            {"Louisiana", "Baton Rouge"},
            {"Oregon", "Salem"},
            {"Oklahoma", "Oklahoma City"},
            {"Ohio", "Columbus"},
            {"North Dakota", "Bismark"},
            {"New York", "Albany"},
            {"New Mexico", "Santa Fe"},
            {"New Jersey", "Trenton"},
            {"New Hampshire", "Concord"},
            {"Nevada", "Carson City"},
            {"Nebraska", "Lincoln"},
            {"Montana", "Helena"},
            {"North Carolina", "Raleigh"},
            {"Missouri", "Jefferson City"},
            {"Mississippi", "Jackson"},
            {"Massachusetts", "Boston"},
            {"Michigan", "Lansing"},
            {"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"}


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