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");break; } } }