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();

        //write your code here......
        switch(grade){
            case "A":
            System.out.println("优秀");break;
            case "B":
            System.out.println("良好");break;
            case "C":
            System.out.println("及格");break;
            case "D":
            System.out.println("不及格");break;
            default:
            System.out.println("未知等级");

        }
        /*if(grade=="A")
        System.out.println("优秀");
        else if(grade=="B")
        System.out.println("良好");
        else if(grade=="C")
        System.out.println("及格");
        else if(grade=="D")
        System.out.println("不及格");
        else 
        System.out.println("未知等级");
*/
    }
}

case分支语句，grade是string类型~case ""