@@ -0,0 +1,119 @@
+package christmas.validator;
+
+import christmas.constant.Menu;
+import christmas.constant.MenuType;
+import christmas.exception.ErrorCode;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+
+public class InputValidator {
+
+    private static int START_DATE = 1;
+    private static int END_DATE = 31;
+    private static String COMMA = ",";
+    private static String HYPHEN = "-";
+    private static int MENU_FORMAT_LENGTH = 2;
+    private static int MINIMUM_ORDER_COUNT = 1;
+    private static int MAXIMUN_ORDER_COUNT = 20;
+
+    public static void validateVisitDate(String input){
+        validateInteger(input);
+        validateNumberInRange(Integer.parseInt(input));
+    }
+
+    public static Map<Menu, Integer> validateMenuOrder(String input, Map<Menu, Integer> orderMenu){
+        String[] orders = input.split(COMMA);
+        Set<Menu> uniqueMenu = new HashSet<>();
+
+        for (String order : orders) {
+            validate(order, orderMenu, uniqueMenu);
+        }
+
+        validateOnlyBeverage(orderMenu);
+        validateMaxOrder(orderMenu);
+
+        return orderMenu;
+    }
+
+    private static void validate(String order, Map<Menu, Integer> orderMenu, Set<Menu> uniqueMenu){
+        String[] parts = validateMenuOrderFormat(order.trim());
+
+        String menuName = parts[0];
+        String quantity = parts[1];
+
+        Menu menu = getMenuByName(menuName);
+
+        validateMenuFound(menu);
+        validateMinimumOrder(quantity);
+        validateDuplicateMenu(menu, uniqueMenu);
+
+        orderMenu.put(menu, Integer.parseInt(quantity));
+    }
+
+    private static void validateInteger(String input){
+        if(!input.chars().allMatch(Character::isDigit)){
+            throw new IllegalArgumentException(ErrorCode.INVALID_DATE.getMessage());
+        }
+    }
+
+    private static void validateNumberInRange(int input){
+        if(input > END_DATE || input < START_DATE)
+            throw new IllegalArgumentException(ErrorCode.INVALID_DATE.getMessage());
+    }
+
+    private static String[] validateMenuOrderFormat(String orders){
+        String[] parts = orders.split(HYPHEN);
+        if (parts.length != MENU_FORMAT_LENGTH)
+            throw new IllegalArgumentException(ErrorCode.INVALID_MENU.getMessage());
+
+        return parts;
+    }
+
+    private static void validateMenuFound(Menu menu){
+        if(menu == null)
+            throw new IllegalArgumentException(ErrorCode.INVALID_MENU.getMessage());
+    }
+
+    private static void validateMinimumOrder(String quantity){
+        if(!quantity.chars().allMatch(Character::isDigit))
+            throw new IllegalArgumentException(ErrorCode.INVALID_MENU.getMessage());
+
+        if(Integer.parseInt(quantity) < MINIMUM_ORDER_COUNT)
+            throw new IllegalArgumentException(ErrorCode.INVALID_MENU.getMessage());
+    }
+
+    private static void validateMaxOrder(Map<Menu, Integer> orderMenu){
+        int orderCount = 0;
+        for(Menu menu: orderMenu.keySet()) {
+            orderCount += orderMenu.get(menu);
+        }
+
+        if(orderCount > MAXIMUN_ORDER_COUNT)
+            throw new IllegalArgumentException(ErrorCode.INVALID_MENU.getMessage());
+    }
+
+    private static void validateDuplicateMenu(Menu menu, Set<Menu> uniqueMenu){
+        if(!uniqueMenu.add(menu))
+            throw new IllegalArgumentException(ErrorCode.INVALID_MENU.getMessage());
+    }
+
+
+    private static void validateOnlyBeverage(Map<Menu, Integer> orderMenu){
+        boolean allBeverages = orderMenu.keySet().stream()
+                .allMatch(menu -> menu.getMenuType() == MenuType.BEVERAGE);
+
+        if (allBeverages) {
+            throw new IllegalArgumentException(ErrorCode.INVALID_MENU.getMessage());
+        }
+    }
+
+    private static Menu getMenuByName(String name) {
+        for (Menu menu : Menu.values()) {
+            if (menu.getName().equalsIgnoreCase(name)) {
+                return menu;
+            }
+        }
+        return null;
+    }
+}

리뷰: 이 부분에서 Exception을 던져주는 것도 좋을 것 같아요!