[java-baseball] yohan.kim(김요한) 과제 제출합니다.

docs/README.md

@@ -0,0 +1,8 @@
+# 기능 목록
+
+- [x] 게임 관리 - GameManager class
+  - [x] 게임 시작 - start()
+- [x] 숫자 야구 구현 - BaseballGame class
+  - [x] 세 자리수 랜덤 숫자 생성 - generateAnswer()
+  - [x] 사용자 입력 받기 - receiveUserInput()
+  - [x] 사용자 숫자를 받아 채점 및 정답 여부 반환 - score()

src/main/java/baseball/Application.java

@@ -2,6 +2,7 @@
 
 public class Application {
     public static void main(String[] args) {
-        // TODO: 프로그램 구현
+        GameManager gameManager = new GameManager();
+        gameManager.start();
     }
 }

src/main/java/baseball/BaseballGame.java

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+package baseball;
+
+import camp.nextstep.edu.missionutils.Console;
+import camp.nextstep.edu.missionutils.Randoms;
+
+import java.util.*;
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.concurrent.atomic.AtomicLong;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+public class BaseballGame {
+
+    private Integer answer;
+
+    public BaseballGame() {
+        this.answer = 0;
+    }
+
+    public Integer getAnswer() {
+        return answer;
+    }
+
+    public int generateAnswer() {
+
+        AtomicInteger index = new AtomicInteger();
+
+        LinkedHashSet<Integer> numbers = new LinkedHashSet<>();
+        while (numbers.size() < 3) {
+            numbers.add(Randoms.pickNumberInRange(1, 9));
+        }
+
+        answer = numbers.stream().reduce(0, (x, y) -> {
+            int result = (int) (x + y * Math.pow(10, 2 - index.doubleValue()));
+            index.getAndIncrement();
+            return result;
+        });
+        return answer;
+    }
+
+    public int receiveUserInput() {
+        System.out.print("숫자를 입력해주세요 : ");
+
+        String input = Console.readLine();
+        validateInput(input);
+
+        try {
+            return Integer.parseInt(input);
+        } catch (NumberFormatException e) {
+            throw new IllegalArgumentException("잘못된 입력 형식입니다.");
+        }
+    }
+
+    private void validateInput(String input) {
+        if (input.length() != 3) {
+            throw new IllegalArgumentException("잘못된 입력 형식입니다.");
+        }
+    }
+
+    public boolean score(int answer, int userAnswer) {
+
+        List<Integer> answerDigits = getDigits(answer);
+        List<Integer> userAnswerDigits = getDigits(userAnswer);
+
+        int strike = 0;
+        int ball = 0;
+        for (int index = 0; index < 3; index++) {
+            int num = userAnswerDigits.get(index);
+
+            if (num == answerDigits.get(index)) {
+                strike++;
+                continue;
+            }
+
+            if (answerDigits.contains(num)) {
+                ball++;
+            }
+        }
+
+        StringBuilder sb = new StringBuilder();
+        if (strike == 0 && ball == 0) {
+            sb.append("낫싱");
+        }
+
+        if (ball > 0) {
+            sb.append(ball).append("볼 ");
+        }
+        if (strike > 0) {
+            sb.append(strike).append("스트라이크 ");
+        }
+        System.out.println(sb);
+
+        if (strike == 3) {
+            System.out.println("3개의 숫자를 모두 맞히셨습니다! 게임 종료");
+            return true;
+        }
+        return false;
+    }
+
+    private static List<Integer> getDigits(int num) {
+        List<Integer> answerNums = new ArrayList<>();
+        int current = num;
+        for (int i = 0; i < 3; i++) {
+            answerNums.add(0, current % 10);
+            current /= 10;
+        }
+        return answerNums;
+    }
+}

src/main/java/baseball/GameManager.java

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+package baseball;
+
+import camp.nextstep.edu.missionutils.Console;
+
+public class GameManager {
+
+    private BaseballGame game;
+
+    public GameManager() {
+        this.game = new BaseballGame();
+    }
+
+    public void start() {
+
+        System.out.println("숫자 야구 게임을 시작합니다.");
+        game.generateAnswer();
+
+        boolean result = false;
+        while (!result) {
+            int userInput = game.receiveUserInput();
+            result = game.score(game.getAnswer(), userInput);
+        }
+
+        String endInput = askRestart();
+        if (endInput.equals("1")) {
+            start();
+        }
+        if (endInput.equals("2")) {
+            return;
+        }
+    }
+
+    private String askRestart() {
+        System.out.println("게임을 새로 시작하려면 1, 종료하려면 2를 입력하세요.");
+        return Console.readLine();
+    }
+}

src/test/java/baseball/BaseballGameTest.java

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+package baseball;
+
+import camp.nextstep.edu.missionutils.Console;
+import org.assertj.core.api.Assertions;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.InputStream;
+import java.io.PrintStream;
+
+import static org.assertj.core.api.Assertions.*;
+import static org.junit.jupiter.api.Assertions.*;
+
+class BaseballGameTest {
+
+    private BaseballGame baseballGame;
+
+    private final InputStream originalIn = System.in;
+    private final PrintStream originalOut = System.out;
+    private final ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
+
+
+    @BeforeEach
+    void setUp() {
+        baseballGame = new BaseballGame();
+        System.setOut(new PrintStream(outputStream));
+    }
+
+    @AfterEach
+    void tearDown() {
+        System.setOut(originalOut);
+        System.setIn(originalIn);
+    }
+
+    @Test
+    void generateAnswer_정답을_answer에_채워넣는다() {
+        baseballGame.generateAnswer();
+
+        assertThat(baseballGame.getAnswer()).isNotEqualTo(0);
+    }
+
+    @Test
+    void generateAnswer_정답은_세자리수_이다() {
+        baseballGame.generateAnswer();
+
+        int length = baseballGame.getAnswer().toString().length();
+        assertThat(length).isEqualTo(3);
+    }
+
+    @Test
+    void receiveUserInput_유저의_입력을_반환한다() {
+        String input = "123";
+        ByteArrayInputStream inputStream = new ByteArrayInputStream(input.getBytes());
+        System.setIn(inputStream);
+
+        int result = baseballGame.receiveUserInput();
+
+        assertThat(result).isEqualTo(Integer.parseInt(input));
+    }
+
+    @Test
+    void score_한개만_맞으면_1스트라이크를_출력한다() {
+        boolean result = baseballGame.score(123, 145);
+
+        String output = outputStream.toString().trim();
+
+        assertThat(result).isFalse();
+        assertThat(output).isEqualTo("1스트라이크");
+    }
+
+    @Test
+    void score_다른_자리에_같은_숫자가_있으면_1볼을_출력한다() {
+        boolean result = baseballGame.score(123, 245);
+
+        String output = outputStream.toString().trim();
+
+        assertThat(result).isFalse();
+        assertThat(output).isEqualTo("1볼");
+    }
+
+    @Test
+    void score_3숫자_모두_맞추면_정답메세지를_출력하고_true를_반환한다() {
+        boolean result = baseballGame.score(123, 123);
+
+        String output = outputStream.toString().trim();
+
+        assertThat(result).isTrue();
+        assertThat(output).isEqualTo("3스트라이크 \n" +
+                "3개의 숫자를 모두 맞히셨습니다! 게임 종료");
+    }
+}

src/test/java/baseball/GameManagerTest.java

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+package baseball;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class GameManagerTest {
+
+    @Test
+    void start() {
+    }
+}