add racing car

src/main/java/racing/Application.java

@@ -0,0 +1,16 @@
+package racing;
+
+import racing.console.ConsoleInputView;
+import racing.console.ConsoleOutputView;
+import racing.core.Game;
+import racing.core.InputView;
+import racing.core.OutputView;
+
+public class Application {
+    public static void main(String[] args) {
+        InputView inputView = new ConsoleInputView();
+        OutputView outputView = new ConsoleOutputView();
+        Game game = new Game(inputView, outputView);
+        game.play();
+    }
+}

src/main/java/racing/README.md

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+# 요구사항
+
+- core
+    - 게임
+        - 횟수
+        - 우승자를 판별
+    - 자동차
+        - 이름: 5자 이하
+        - position: 현재 위치
+        - move
+            - 0에서 9 사이에서 random값을 구한 후 random 값이 4이상이면 전진한다
+- 입력
+    - 자동차 이름들을 입력받는다. 자동차 이름은 쉼표(,)로 구분한다
+    - 게임 실행 횟수를 입력받는다.
+- 출력
+    - 한 번 실행할 때마다 자동차 이름과 이동 거리를 출력한다.
+    - 우승자 이름을 출력한다.
+
+필요한동작
+
+- 자동차가 움직인다 Car.move()
+
+랜덤을 어떻게 테스트하지?
+
+- 운전 전략을 집어넣자
+    - Driver.shouldMove()

src/main/java/racing/console/ConsoleInputView.java

@@ -0,0 +1,37 @@
+package racing.console;
+
+import racing.core.Car;
+import racing.core.CrazyDriver;
+import racing.core.InputView;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Scanner;
+
+public class ConsoleInputView implements InputView {
+    private final Scanner scanner = new Scanner(System.in);
+
+    @Override
+    public List<Car> getCars(String message) {
+        System.out.println(message);
+        String line = this.scanner.nextLine();
+        String[] names = line.split(",");
+
+        List<Car> cars = new ArrayList<>();
+        for (String name : names) {
+            cars.add(new Car(name, new CrazyDriver()));
+        }
+
+        return cars;
+    }
+
+    @Override
+    public int getTrackLength(String message) {
+        System.out.println(message);
+        String line = this.scanner.nextLine();
+
+        int trackLength = Integer.parseInt(line);
+
+        return trackLength;
+    }
+}

src/main/java/racing/console/ConsoleOutputView.java

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+package racing.console;
+
+import racing.core.OutputView;
+
+public class ConsoleOutputView implements OutputView {
+    private static final String NEW_LINE = System.lineSeparator();
+    private static final StringBuilder buffer = new StringBuilder();
+
+    @Override
+    public void print(String message) {
+        buffer.append(message);
+    }
+
+    @Override
+    public void println(String message) {
+        buffer.append(message);
+        buffer.append(NEW_LINE);
+    }
+
+    @Override
+    public void flush() {
+        System.out.print(buffer);
+        buffer.setLength(0);
+    }
+}

src/main/java/racing/core/Car.java

@@ -0,0 +1,36 @@
+package racing.core;
+
+public class Car {
+    private final String name;
+    private final Driver driver;
+    private int position;
+
+    public Car(String name, Driver driver) {
+        this.name = name;
+        this.driver = driver;
+        this.position = 0;
+    }
+
+    public void move() {
+        if (driver.shouldMove()) {
+            ++this.position;
+        }
+    }
+
+    public boolean positionedAt(int position) {
+        return this.position == position;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public int getPosition() {
+        return this.position;
+    }
+
+    @Override
+    public String toString() {
+        return this.name + " : " + "-".repeat(position);
+    }
+}

src/main/java/racing/core/CrazyDriver.java

@@ -0,0 +1,14 @@
+package racing.core;
+
+import java.util.Random;
+
+public class CrazyDriver implements Driver {
+    private static final int MOVE_BOUND = 10;
+    private static final int MOVE_THRESHOLD = 4;
+    private final Random random = new Random();
+
+    @Override
+    public boolean shouldMove() {
+        return random.nextInt(MOVE_BOUND) > MOVE_THRESHOLD;
+    }
+}

src/main/java/racing/core/Driver.java

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+package racing.core;
+
+public interface Driver {
+    boolean shouldMove();
+}

src/main/java/racing/core/Game.java

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+package racing.core;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class Game {
+    private static final String ENTER_CAR_MESSAGE = "경주할 자동차 이름을 입력하세요(이름은 쉼표(,)를 기준으로 구분).";
+    private static final String ENTER_TRACK_LENGTH_MESSAGE = "시도할 회수는 몇회인가요?";
+    private final InputView inputView;
+    private final OutputView outputView;
+    private final List<Car> cars;
+    private final int trackLength;
+
+    public Game(InputView inputView, OutputView outputView) {
+        this.inputView = inputView;
+        this.outputView = outputView;
+
+        this.cars = inputView.getCars(ENTER_CAR_MESSAGE);
+        this.trackLength = inputView.getTrackLength(ENTER_TRACK_LENGTH_MESSAGE);
+    }
+
+    public void play() {
+        this.outputView.println("실행 결과");
+        for (int i = 0; i < this.trackLength; i++) {
+            for (Car car : this.cars) {
+                car.move();
+            }
+            for (Car car : this.cars) {
+                this.outputView.println(car.toString());
+            }
+            this.outputView.println("");
+        }
+
+
+        List<String> winners = new ArrayList<>();
+        int maxPosition = 0;
+        for (Car car : this.cars) {
+            maxPosition = Math.max(car.getPosition(), maxPosition);
+        }
+
+        for (Car car : this.cars) {
+            if (car.positionedAt(maxPosition)) {
+                winners.add(car.getName());
+            }
+        }
+
+        this.outputView.println(String.join(", ", winners) + "가 최종 우승했습니다.");
+        this.outputView.flush();
+    }
+
+}

src/main/java/racing/core/InputView.java

@@ -0,0 +1,9 @@
+package racing.core;
+
+import java.util.List;
+
+public interface InputView {
+    List<Car> getCars(String message);
+
+    int getTrackLength(String message);
+}

src/main/java/racing/core/OutputView.java

@@ -0,0 +1,9 @@
+package racing.core;
+
+public interface OutputView {
+    void print(String message);
+
+    void println(String message);
+
+    void flush();
+}

src/test/java/racing/core/CarTest.java

@@ -0,0 +1,39 @@
+package racing.core;
+
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class CarTest {
+
+    @Test
+    void moveTest1() {
+        Car car = new Car("tester", () -> true);
+
+        car.move();
+
+        assertThat(car.positionedAt(1)).isTrue();
+        assertThat(car.toString()).isEqualTo("tester : -");
+    }
+
+    @Test
+    void moveTest2() {
+        Car car = new Car("tester", () -> true);
+
+        car.move();
+        car.move();
+
+        assertThat(car.positionedAt(2)).isTrue();
+        assertThat(car.toString()).isEqualTo("tester : --");
+    }
+
+    @Test
+    void moveTest3() {
+        Car car = new Car("tester", () -> false);
+
+        car.move();
+
+        assertThat(car.positionedAt(0)).isTrue();
+        assertThat(car.toString()).isEqualTo("tester : ");
+    }
+}