如何打印出正确的成绩界别

Question

我想利用Switch打印出成绩的级别，可是不知道怎么在程序中输入成绩。并且在执行的时候出现了数组溢出的错我。希望帮我调试一下，并且在输入95或者别的成绩时给出正确的成绩级别。请给出详细的调试之后的代码。谢谢。我写的测绘功能徐如下所示：
public class TestSwitch
{
   public static void main(String args[])
                {int i=Integer.parseInt(args[0]);
                 System.out.println("请输入成绩：");
                    int a=i/10;
                       switch(a)
                       {case 10:
                        case 9:
                                System.out.println("优秀");
                                break;
                        case 8:
                                         
                                System.out.println("良好");
                                break;
                        case 7:
                                        
                                System.out.println("中等");
                                break;                
                         case 6:
                                       
                                System.out.println("及格");
                                break;          
                            default:
                                System.out.println("不及格");         
                     }
          }
}

Answer 1

public class TestSwitch {
    public static void main(String args[]) {
        System.out.print("请输入成绩：");
        Scanner scan = new Scanner(System.in);
        while (true) {
            String s = scan.next();
            if (s == null || s.equalsIgnoreCase("quit")) {
                break;
            }
            int i = Integer.parseInt(s.trim());
            int a = i / 10;
            switch (a) {
            case 10:
            case 9:
                System.out.println("优秀");
                break;
            case 8:                System.out.println("良好");
                break;
            case 7:                System.out.println("中等");
                break;
            case 6:                System.out.println("及格");
                break;
            default:
                System.out.println("不及格");
            }
        }
        scan.close();
    }}

Answer 2

程序没有输入参数args[0]吗？public static void main(String[] args) throws Exception{
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
String str = null;
while(true){
System.out.println("请输入成绩：");
int scores = 0;
str = reader.readLine();
while(str == null || "".equals(str.trim())){
System.out.println("输入成绩不合法！请重新输入");
str = reader.readLine();
}
try{
scores = Integer.parseInt(str);
}catch(Exception e){
e.printStackTrace();
}
int a = scores / 10;
switch(a){
case 10:
case 9:
System.out.println("优秀");
break;
case 8: System.out.println("良好");
break;
case 7: System.out.println("中等");
break;
case 6: System.out.println("及格");
break;
default:
System.out.println("不及格");
}
}
}

Answer 3

代码上面都写好了
你用的是什么编译工具？如果是eclipse的话run-->open run dialog-->arguments,输入参数
如果是在命令行的话,javac TestSwitch.java 参数