使用Java中的枚举制作评分标尺，然后允许用户输入数字评分以输出字母评分

public enum RatingScale {
    A("优秀"),
    B("良好"),
    C("中等"),
    D("及格"),
    E("不及格");

    private String letterGrade;

    RatingScale(String letterGrade) {
        this.letterGrade = letterGrade;
    }

    public String getLetterGrade() {
        return letterGrade;
    }
}

public String convertToLetterGrade(int score) {
    RatingScale[] scales = RatingScale.values();
    int index = score - 1; // 数字评分从1开始，而数组索引从0开始
    if (index >= 0 && index < scales.length) {
        return scales[index].getLetterGrade();
    } else {
        return "无效评分";
    }
}

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("请输入评分：");
        int score = scanner.nextInt();

        String letterGrade = convertToLetterGrade(score);
        System.out.println("字母评分为：" + letterGrade);
    }

    public static String convertToLetterGrade(int score) {
        // 省略方法实现，参考前面的代码
    }
}