[이재훈_Backend] 객체지향 2주차 제출

.gitignore

@@ -31,3 +31,5 @@ out/
 ### VS Code ###
 .vscode/
 .DS_Store
+bin/
+*.class

src/main/java/racingcar/Application.java

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

src/main/java/racingcar/Car.java

@@ -0,0 +1,26 @@
+package racingcar;
+
+public class Car {
+
+    private final String name;
+    private int position;
+
+    public Car(String name) {
+        this.name = name;
+        this.position = 0;
+    }
+
+    public void move(int number, int threshold) {
+        if (number >= threshold) {
+            position++;
+        }
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public int getPosition() {
+        return position;
+    }
+}

src/main/java/racingcar/RacingGame.java

@@ -0,0 +1,132 @@
+package racingcar;
+
+import camp.nextstep.edu.missionutils.Console;
+import camp.nextstep.edu.missionutils.Randoms;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class RacingGame {
+
+    private static final int MAX_CAR_NAME_LENGTH = 5;
+    private static final int MIN_TRY_COUNT = 1;
+    private static final int RANDOM_START = 0;
+    private static final int RANDOM_END = 9;
+    private static final int MOVE_THRESHOLD = 4;
+
+    public void start() {
+        List<Car> cars = createCars();
+        int tryCount = inputTryCount();
+
+        System.out.print('\n');
+        System.out.println("실행 결과");
+
+        for (int i = 0; i < tryCount; i++) {
+            moveCars(cars);
+            printCars(cars);
+        }
+
+        printWinners(cars);
+    }
+
+    private List<Car> createCars() {
+        System.out.println("경주할 자동차 이름을 입력하세요.(이름은 쉼표(,) 기준으로 구분)");
+        String input = Console.readLine();
+        String[] names = input.split(",");
+
+        validateNames(names);
+
+        List<Car> cars = new ArrayList<>();
+        for (String name : names) {
+            cars.add(new Car(name));
+        }
+        return cars;
+    }
+
+    private int inputTryCount() {
+        System.out.println("시도할 회수는 몇회인가요?");
+        String input = Console.readLine();
+        int count = parseTryCount(input);
+
+        if (count < MIN_TRY_COUNT) {
+            throw new IllegalArgumentException();
+        }
+
+        return count;
+    }
+
+    private int parseTryCount(String input) {
+        try {
+            return Integer.parseInt(input);
+        } catch (NumberFormatException e) {
+            throw new IllegalArgumentException();
+        }
+    }
+
+    private void validateNames(String[] names) {
+        List<String> used = new ArrayList<>();
+
+        for (String name : names) {
+            validateName(name);
+
+            if (used.contains(name)) {
+                throw new IllegalArgumentException();
+            }
+            used.add(name);
+        }
+    }
+
+    private void validateName(String name) {
+        if (name.isEmpty()) {
+            throw new IllegalArgumentException();
+        }
+
+        if (name.chars().anyMatch(Character::isWhitespace)) {
+            throw new IllegalArgumentException();
+        }
+
+        if (name.length() > MAX_CAR_NAME_LENGTH) {
+            throw new IllegalArgumentException();
+        }
+    }
+
+    private void moveCars(List<Car> cars) {
+        for (Car car : cars) {
+            int number = Randoms.pickNumberInRange(RANDOM_START, RANDOM_END);
+            car.move(number, MOVE_THRESHOLD);
+        }
+    }
+
+    private void printCars(List<Car> cars) {
+        for (Car car : cars) {
+            System.out.println(car.getName() + " : " + "-".repeat(car.getPosition()));
+        }
+        System.out.print('\n');
+    }
+
+    private void printWinners(List<Car> cars) {
+        int max = findMaxPosition(cars);
+        List<String> winners = findWinners(cars, max);
+        System.out.println("최종 우승자 : " + String.join(", ", winners));
+    }
+
+    private int findMaxPosition(List<Car> cars) {
+        int max = 0;
+        for (Car car : cars) {
+            max = Math.max(max, car.getPosition());
+        }
+        return max;
+    }
+
+    private List<String> findWinners(List<Car> cars, int max) {
+        List<String> winners = new ArrayList<>();
+
+        for (Car car : cars) {
+            if (car.getPosition() == max) {
+                winners.add(car.getName());
+            }
+        }
+
+        return winners;
+    }
+}