2주차 - Step2 로또(자동) 피드백 요청드립니다.

README.md

@@ -52,6 +52,43 @@
     - [x] REFACTORING
 - [x] 외부로 위임된 StringCalculator 안의 메서드들 정리
 
-
 ### step1 - 이슈
-- Element 객체를 불변 객체로 만들 필요가 있을지
+- Element 객체를 불변 객체로 만들 필요가 있을지
+
+
+### step2 - 로또(자동)
+- [ ] 로또번호(LottoNumber) 객체 생성
+    - [x] TEST - 로또번호의 범위는 1~45의 자연수
+    - [x] REFACTORING
+- [ ] 로또복권(LottoTicket) 객체 생성
+    - [x] TEST - 로또복권의 로또번호는 중복이 없다
+    - [x] TEST - 로또복권의 로또번호는 6개다
+    - [x] TEST - 당첨번호와 비교해서 일치하는 개수를 반환한다 (ArrayList.contains())
+    - [ ] REFACTORING
+- [ ] 로또복권생성기(LottoTicketGenerator) 객체 생성
+    - [x] TEST - 로또번호(1~45)가 담긴 리스트를 생성한다
+    - [x] TEST - 생성된 로또번호를 섞는다 (Collections.shuffle())
+    - [x] TEST - 섞인 로또번호 리스트에서 6개의 로또번호를 선택한다
+    - [x] TEST - 선택된 로또번호를 정렬한다 (Collections.sort())
+    - [ ] REFACTORING
+- [ ] 당첨번호(LuckyNumber) 객체 생성
+    - [x] TEST - 입력받은 당첨번호로 일급 컬렉션을 생성한다
+    - [ ] REFACTORING
+- [ ] 로또자동판매기(LottoSeller) 객체 생성
+    - [x] TEST - 금액을 입력 받아 구입할 로또 복권 개수를 반환한다
+    - [x] TEST - 구입할 개수만큼 로또복권을 생성한다
+    - [x] TEST - 각 일치 개수 별 당첨된 복권의 개수를 반환한다
+    - [x] TEST - 생성된 로또복권의 수익률을 계산한다
+    - [ ] REFACTORING
+- [ ] 당첨결과를 매칭할 Enum(LottoRank) 객체 생성
+    - [x] REFACTORING
+- [ ] InputView 객체 생성
+    - [x] TEST - 구입 금액을 입력받고, 출력한다
+    - [x] TEST - 구매 개수를 LottoSeller로 부터 반환받아서 출력한다
+    - [x] TEST - 구매 개수만큼 생성된 로또복권들을 출력한다
+    - [x] TEST - 지난주 당첨 번호를 입력 받는다
+    - [ ] REFACTORING
+- [ ] OutputView 객체 생성
+    - [x] TEST - 각 일치 개수 별 당첨된 복권의 개수를 LottoSeller로 부터 반환받아서 출력한다
+    - [ ] TEST - 총 수익률을 LottoSeller로 부터 반환받아서 출력한다.
+    - [ ] REFACTORING

src/main/java/step1/Element.java

@@ -10,7 +10,7 @@ public class Element {
 
     private int value;
 
-    public Element(int value) {
+    private Element(int value) {
         this.value = value;
     }
 

src/main/java/step2/LottoApplication.java

@@ -0,0 +1,29 @@
+package step2;
+
+import step2.domain.LottoRank;
+import step2.domain.LottoSeller;
+import step2.domain.LottoTicket;
+import step2.view.InputView;
+import step2.view.OutputView;
+
+import java.util.List;
+import java.util.Map;
+
+public class LottoApplication {
+
+    public static void main(String[] args) {
+        final int inputMoney = InputView.askMoneyToInput();
+        final int numberOfTicketsToBuy = LottoSeller.countLottoTickets(inputMoney);
+
+        OutputView.printNumberOfLottoTickets(numberOfTicketsToBuy);
+
+        List<LottoTicket> lottoTickets = LottoSeller.issueLottoTicket(numberOfTicketsToBuy);
+        OutputView.printLottoTickets(lottoTickets);
+
+        LottoTicket luckyNumber = LottoSeller.getLuckyNumber(InputView.askLuckyNumber());
+        Map<LottoRank, List<LottoTicket>> lottoResultMap = LottoSeller.getLottoResult(lottoTickets, luckyNumber);
+
+        OutputView.printResult(lottoResultMap, numberOfTicketsToBuy);
+    }
+}
+

src/main/java/step2/domain/LottoBalls.java

@@ -0,0 +1,17 @@
+package step2.domain;
+
+import java.util.List;
+import java.util.stream.Collectors;
+import java.util.stream.IntStream;
+
+public class LottoBalls {
+
+    private static List<Integer> lottoBalls = IntStream
+            .rangeClosed(LottoNumber.MINIMUM_LOTTO_NUMBER, LottoNumber.MAXIMUM_LOTTO_NUMBER)
+            .boxed()
+            .collect(Collectors.toList());
+
+    public static List<Integer> getLottoBalls() {
+        return lottoBalls;
+    }
+}

src/main/java/step2/domain/LottoNumber.java

@@ -0,0 +1,47 @@
+package step2.domain;
+
+import java.util.Objects;
+
+public class LottoNumber {
+    static final String ALERT_OUT_OF_RANGE_OF_LOTTO_NUMBER = "로또번호는 1부터 45까지의 자연수만 가능합니다.";
+    static final int MINIMUM_LOTTO_NUMBER = 1;
+    static final int MAXIMUM_LOTTO_NUMBER = 45;
+    private int number;
+
+    private LottoNumber(int number) {
+        if (isOutOfRange(number)) {
+            throw new IllegalArgumentException(ALERT_OUT_OF_RANGE_OF_LOTTO_NUMBER);
+        }
+        this.number = number;
+    }
+
+    public static LottoNumber from(Integer number) {
+        return new LottoNumber(number);
+    }
+
+    private boolean isOutOfRange(int number) {
+        return number < MINIMUM_LOTTO_NUMBER || number > MAXIMUM_LOTTO_NUMBER;
+    }
+
+    public int getNumber() {
+        return number;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        LottoNumber that = (LottoNumber) o;
+        return number == that.number;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(number);
+    }
+
+    @Override
+    public String toString() {
+        return number + "";
+    }
+}

src/main/java/step2/domain/LottoRank.java

@@ -0,0 +1,35 @@
+package step2.domain;
+
+import java.util.Arrays;
+
+public enum LottoRank {
+
+    FIRST_PLACE(6, 2000000000),
+    SECOND_PLACE(5, 1500000),
+    THIRD_PLACE(4, 50000),
+    FOURTH_PLACE(3, 5000),
+    LOSER(0, 0);
+
+    private int numberOfMatchedToLuckyNumber;
+    private int prizeMoney;
+
+    LottoRank(int numberOfMatchedToLuckyNumber, int prizeMoney) {
+        this.numberOfMatchedToLuckyNumber = numberOfMatchedToLuckyNumber;
+        this.prizeMoney = prizeMoney;
+    }
+
+    public static LottoRank from(int countMatchedNumbers) {
+        return Arrays.stream(LottoRank.values())
+                .filter(lottoRank -> lottoRank.numberOfMatchedToLuckyNumber == countMatchedNumbers)
+                .findFirst()
+                .orElse(LOSER);
+    }
+
+    public int getNumberOfMatchedToLuckyNumber() {
+        return numberOfMatchedToLuckyNumber;
+    }
+
+    public int getPrizeMoney() {
+        return prizeMoney;
+    }
+}

src/main/java/step2/domain/LottoSeller.java

@@ -0,0 +1,48 @@
+package step2.domain;
+
+import java.util.*;
+import java.util.stream.Collectors;
+
+public class LottoSeller {
+    static final int PRICE_OF_A_LOTTO_TICKET = 1000;
+    static final String ALERT_MISSING_MONEY = "돈을 넣어주세요. 로또복권은 한 장당 1000원 입니다.";
+
+    public static int countLottoTickets(int inputMoney) {
+        validationInputMoney(inputMoney);
+        return inputMoney / PRICE_OF_A_LOTTO_TICKET;
+    }
+
+    public static List<LottoTicket> issueLottoTicket(int numberOfTicketsToBuy) {
+        List<LottoTicket> lottoTickets = new ArrayList<>();
+
+        for (int i = 0; i < numberOfTicketsToBuy; i++) {
+            lottoTickets.add(LottoTicketGenerator.issue());
+        }
+        return lottoTickets;
+    }
+
+    public static LottoTicket getLuckyNumber(List<Integer> inputLuckyNumber) {
+        List<LottoNumber> lottoTicket = inputLuckyNumber.stream()
+                .map(LottoNumber::from)
+                .collect(Collectors.toList());
+        return LottoTicketGenerator.issue(lottoTicket);
+    }
+
+    public static Map<LottoRank, List<LottoTicket>> getLottoResult(List<LottoTicket> lottoTickets, LottoTicket luckyNumber) {
+        Map<LottoRank, List<LottoTicket>> lottoResultMap = new HashMap<>();
+
+        for (LottoTicket ticket : lottoTickets) {
+            LottoRank lottoRank = LottoRank.from(ticket.getNumberOfMatchedToLuckyNumber(luckyNumber));
+            List<LottoTicket> ticketsCorrespondingToRank = lottoResultMap.getOrDefault(lottoRank, new ArrayList<>());
+            ticketsCorrespondingToRank.add(ticket);
+            lottoResultMap.put(lottoRank, ticketsCorrespondingToRank);
+        }
+        return lottoResultMap;
+    }
+
+    private static void validationInputMoney(int inputMoney) {
+        if (inputMoney < PRICE_OF_A_LOTTO_TICKET) {
+            throw new IllegalArgumentException(ALERT_MISSING_MONEY);
+        }
+    }
+}

src/main/java/step2/domain/LottoTicket.java

@@ -0,0 +1,66 @@
+package step2.domain;
+
+import java.util.Collections;
+import java.util.List;
+import java.util.Objects;
+
+public class LottoTicket {
+    static final String ALERT_NUMBER_OVERLAP = "중복된 로또 번호가 존재합니다.";
+    static final String AlERT_DIFFERENT_SIZE_OF_NUMBERS = "로또번호의 개수가 6개가 아닙니다.";
+
+    private final List<LottoNumber> lottoTicket;
+
+    LottoTicket(List<LottoNumber> lottoTicket) {
+        validationNumberSize(lottoTicket);
+        validationNumberOverlap(lottoTicket);
+        this.lottoTicket = lottoTicket;
+    }
+
+    private void validationNumberSize(List<LottoNumber> lottoTicket) {
+        if (lottoTicket.size() != LottoTicketGenerator.BASIC_LOTTO_SIZE) {
+            throw new IllegalArgumentException(AlERT_DIFFERENT_SIZE_OF_NUMBERS);
+        }
+    }
+
+    private void validationNumberOverlap(List<LottoNumber> lottoTicket) {
+        long SizeOfLottoTicket = lottoTicket.stream()
+                .mapToLong(LottoNumber::getNumber)
+                .distinct()
+                .count();
+
+        if (SizeOfLottoTicket != LottoTicketGenerator.BASIC_LOTTO_SIZE) {
+            throw new IllegalArgumentException(ALERT_NUMBER_OVERLAP);
+        }
+    }
+
+    public int getNumberOfMatchedToLuckyNumber(LottoTicket luckyNumber) {
+        return (int) luckyNumber.getLottoTicket().stream()
+                .filter(lottoTicket::contains)
+                .count();
+    }
+
+    public List<LottoNumber> getLottoTicket() {
+        return Collections.unmodifiableList(lottoTicket);
+    }
+
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        LottoTicket that = (LottoTicket) o;
+        return Objects.equals(lottoTicket, that.lottoTicket);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(lottoTicket);
+    }
+
+    @Override
+    public String toString() {
+        return "LottoTicket{" +
+                "lottoTicket=" + lottoTicket +
+                '}';
+    }
+}

src/main/java/step2/domain/LottoTicketGenerator.java

@@ -0,0 +1,31 @@
+package step2.domain;
+
+import java.util.Collections;
+import java.util.List;
+import java.util.stream.Collectors;
+
+public class LottoTicketGenerator {
+    static final int BASIC_LOTTO_SIZE = 6;
+
+    static LottoTicket issue() {
+        return new LottoTicket(pickLottoBalls(LottoBalls.getLottoBalls()));
+    }
+
+    static LottoTicket issue(List<LottoNumber> lottoTicket) {
+        return new LottoTicket(lottoTicket);
+    }
+
+    static List<LottoNumber> pickLottoBalls(List<Integer> lottoBalls) {
+        shuffleLottoBalls(lottoBalls);
+        return lottoBalls.stream()
+                .limit(BASIC_LOTTO_SIZE)
+                .sorted()
+                .map(LottoNumber::from)
+                .collect(Collectors.toList());
+    }
+
+    static void shuffleLottoBalls(List<Integer> lottoBalls) {
+        Collections.shuffle(lottoBalls);
+    }
+
+}

src/main/java/step2/view/InputView.java

@@ -0,0 +1,34 @@
+package step2.view;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.Scanner;
+import java.util.stream.Collectors;
+
+public class InputView {
+    private static final String LUCKY_NUMBER_SEPARATOR = ",";
+    private static Scanner scanner = new Scanner(System.in);
+
+    public static int askMoneyToInput() {
+        System.out.println("구입금액을 입력해 주세요.");
+        return scanner.nextInt();
+    }
+
+    public static List<Integer> askLuckyNumber() {
+        printBlackLine();
+        scanner.nextLine();
+        System.out.println("지난 주 당첨 번호를 입력해주세요.");
+        String inputLuckyNumber = scanner.nextLine();
+        printBlackLine();
+
+        return Arrays.stream(inputLuckyNumber.split(LUCKY_NUMBER_SEPARATOR))
+                .map(String::trim)
+                .mapToInt(Integer::parseInt)
+                .boxed()
+                .collect(Collectors.toList());
+    }
+
+    private static void printBlackLine() {
+        System.out.println();
+    }
+}