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| 1 | +package ch_21; |
| 2 | + |
| 3 | +import java.io.IOException; |
| 4 | +import java.net.URL; |
| 5 | +import java.util.ArrayList; |
| 6 | +import java.util.HashMap; |
| 7 | +import java.util.Scanner; |
| 8 | + |
| 9 | +/** |
| 10 | + * *21.13 (Baby name popularity ranking) Revise Programming Exercise 21.11 to prompt |
| 11 | + * the user to enter year, gender, and name and display the ranking for the name. |
| 12 | + * Prompt the user to enter another inquiry or exit the program. Here is a sample |
| 13 | + * run: |
| 14 | + * Enter the year: 2010 |
| 15 | + * Enter the gender: M |
| 16 | + * Enter the name: Javier |
| 17 | + * Boy name Javier is ranked #190 in year 2010 |
| 18 | + * Enter another inquiry? Y |
| 19 | + * Enter the year: 2001 |
| 20 | + * Enter the gender: F |
| 21 | + * Enter the name: Emily |
| 22 | + * Girl name Emily is ranked #1 in year 2001 |
| 23 | + * Enter another inquiry? N |
| 24 | + */ |
| 25 | +public class Exercise12_13 { |
| 26 | + static ArrayList<HashMap<String, String>> boysNames = new ArrayList<>(); |
| 27 | + static ArrayList<HashMap<String, String>> girlsNames = new ArrayList<>(); |
| 28 | + |
| 29 | + static final String BABY_NAMES_BASE_URL = "https://liveexample.pearsoncmg.com/data/babynameranking"; |
| 30 | + static String[] babyNamesHttpPaths; |
| 31 | + static final int BOY = 1; |
| 32 | + static final int GIRL = 3; |
| 33 | + String selectedYear; |
| 34 | + String selectedGender; |
| 35 | + String selectedName; |
| 36 | + |
| 37 | + static { |
| 38 | + babyNamesHttpPaths = new String[10]; |
| 39 | + // Resolve url paths for txt files |
| 40 | + for (int i = 0, year = 2001; i < 10; year++, i++) { |
| 41 | + babyNamesHttpPaths[i] = BABY_NAMES_BASE_URL + year + ".txt"; |
| 42 | + } |
| 43 | + } |
| 44 | + |
| 45 | + public static void main(String[] args) { |
| 46 | + Exercise12_13 context = new Exercise12_13(); |
| 47 | + Scanner in = new Scanner(System.in); |
| 48 | + try { |
| 49 | + context.populateRankings(boysNames, BOY); |
| 50 | + context.populateRankings(girlsNames, GIRL); |
| 51 | + for (; ; ) { |
| 52 | + System.out.print("\nEnter the year: "); |
| 53 | + context.selectedYear = in.next().trim(); |
| 54 | + |
| 55 | + System.out.print("\nEnter the gender (M or F):"); |
| 56 | + context.selectedGender = in.next().trim(); |
| 57 | + |
| 58 | + System.out.print("\nEnter a name: "); |
| 59 | + context.selectedName = in.next().trim(); |
| 60 | + String result = context.getSelectedRank(boysNames, girlsNames); |
| 61 | + if (result.startsWith("Invalid")) { |
| 62 | + System.out.println(result); |
| 63 | + } else { |
| 64 | + System.out.println((context.selectedGender.equalsIgnoreCase("M") ? "Boy" : "Girl") + " name " |
| 65 | + + context.selectedName + " is ranked #" + result + " in year " + context.selectedYear); |
| 66 | + |
| 67 | + } |
| 68 | + System.out.print("\nEnter another inquiry?(Y or N) "); |
| 69 | + String loop = in.next().trim(); |
| 70 | + if (loop.equalsIgnoreCase("Y")) { |
| 71 | + continue; |
| 72 | + } |
| 73 | + System.out.println("GoodBye"); |
| 74 | + break; |
| 75 | + } |
| 76 | + |
| 77 | + } catch (IOException e) { |
| 78 | + System.out.println("Exception occurred while reading data files.."); |
| 79 | + System.out.println("Exiting the program...."); |
| 80 | + System.exit(1); |
| 81 | + |
| 82 | + } |
| 83 | + |
| 84 | + } |
| 85 | + |
| 86 | + private void populateRankings(ArrayList<HashMap<String, String>> names, |
| 87 | + int gender) throws IOException { |
| 88 | + for (int i = 0; i < babyNamesHttpPaths.length; i++) { |
| 89 | + URL dataUrl = new URL(babyNamesHttpPaths[i]); |
| 90 | + Scanner urlScanner = new Scanner(dataUrl.openStream()); |
| 91 | + HashMap<String, String> map = new HashMap<>(); |
| 92 | + |
| 93 | + while (urlScanner.hasNextLine()) { |
| 94 | + String[] line = urlScanner.nextLine().split("\\s+"); // Split line ex: 1 Jacob 32,550 Emily 25,057 |
| 95 | + String ranking = line[0].trim(); |
| 96 | + map.put(line[gender].trim(), ranking); |
| 97 | + } |
| 98 | + names.add(map); |
| 99 | + urlScanner.close(); |
| 100 | + } |
| 101 | + } |
| 102 | + |
| 103 | + private String getSelectedRank(ArrayList<HashMap<String, String>> boysNames, |
| 104 | + ArrayList<HashMap<String, String>> girlsNames) { |
| 105 | + if (selectedName == null || selectedName.isEmpty() || |
| 106 | + selectedGender == null || selectedGender.isEmpty() || |
| 107 | + selectedYear == null || selectedYear.isEmpty()) { |
| 108 | + return "Invalid: Name, Gender, and Year must not be null or empty."; |
| 109 | + } |
| 110 | + int mapIndex = Integer.parseInt(selectedYear.substring(2)) - 1; // Convert selected year to list index |
| 111 | + String rank = ""; |
| 112 | + if (selectedGender.equalsIgnoreCase("M")) { |
| 113 | + HashMap<String, String> rankings = boysNames.get(mapIndex); |
| 114 | + rank = rankings.get(selectedName); |
| 115 | + } else if (selectedGender.equalsIgnoreCase("F")) { |
| 116 | + HashMap<String, String> rankings = girlsNames.get(mapIndex); |
| 117 | + rank = rankings.get(selectedName); |
| 118 | + } |
| 119 | + |
| 120 | + return rank; |
| 121 | + } |
| 122 | + |
| 123 | +} |
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