[Feat] 로또 구매기능

src/main/java/lotto/BuyingLotto.java

@@ -0,0 +1,39 @@
+package lotto;
+
+import camp.nextstep.edu.missionutils.Console;
+
+public class BuyingLotto {
+    static int lottoCount;
+
+    public BuyingLotto() {
+        buyLotto();
+    }
+
+    private void buyLotto() {
+        boolean validInput = false;
+
+        while (!validInput) {
+            try {
+                System.out.println("구입금액을 입력해 주세요.");
+                String input = Console.readLine();
+                int money = Integer.parseInt(input);
+                validateInput(money);
+                lottoCount = money / 1000;
+                System.out.println(lottoCount + "개를 구매했습니다.");
+                validInput = true;
+            } catch (IllegalArgumentException e) {
+                System.out.println("[ERROR] 금액은 1000원 단위여야 합니다. 다시 입력해 주세요.");
+            }
+        }
+    }
+
+    public int getLottoCount() {
+        return lottoCount;
+    }
+
+    private void validateInput(int money) {
+        if (money % 1000 == 0) return;
+        throw new IllegalArgumentException();
+    }
+
+}