编写java程序:从键盘上读入一个学生成绩，存放在变量score中，根据score的值输出其对应的成绩等级。
import java.util.Scanner;
public class switchCaseAndIfElse {
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
System.out.println("请输入成绩：");
int score = scan.nextInt();
switch(score/10){
case 10:
case 9:
System.out.println("等级A");
break;
case 8:
case 7:
System.out.println("等级B");
break;
case 6:
System.out.println("等级C");
break;
default:
System.out.println("等级D");
break;
}
}
}