public class BranchExample {
    public static void main(String[] args) {
        int score = 85;
        // if文
        if (score >= 90) {
            System.out.println("A");
        } else if (score >= 80) {
            System.out.println("B");
        } else {
            System.out.println("C");
        }

        // モダンな switch 式 (Java 14+)
        String grade = switch (score / 10) {
            case 10, 9 -> "秀";
            case 8 -> "優";
            default -> "可";
        };
    }
}