题解 | #判断学生成绩等级#

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String grade = scanner.next();
        String desc = "未知等级";
        //write your code here......
        switch (grade.charAt(0)) {
            case 'A':
                desc = "优秀";
                break;
            case 'B':
                desc = "良好";
                break;
            case 'C':
                desc = "及格";
                break;
            case 'D':
                desc = "不及格";
                break;
        }
        System.out.println(desc);

    }
}

使用switch……case，也可以不用default，默认值设置为位置等级，不匹配则默认输出位置等级。