请问我该怎么修改才能满足得分点呢

import java.util.Scanner;
public class Main {
public static void main(String args[]) {

    Scanner input = new Scanner(System.in);
    String stunum = input.next();
    int length = stunum.length();
    if(length != 8)
    {
        System.out.println("Wrong Format");
        
    }
    else
    {
        String stucoll01 = "01";
           String stucoll02 = "02";
           String stucoll03 = "03";
           String stucoll20 = "20";
          String college = stunum.substring(2, 4);
           if(college.equals(stucoll01))
           {
               System.out.println("入学年份:20"+stunum.substring(0,2)+"年");
               System.out.println("学院:材料学院");
               System.out.println("班级:"+stunum.substring(4,6));
               System.out.println("学号:"+stunum.substring(6,8));
               
                }
        else if(college.equals(stucoll02))
           {
               System.out.println("入学年份:20"+stunum.substring(0,2)+"年");
               System.out.println("学院:机械学院");
               System.out.println("班级:"+stunum.substring(4,6));
               System.out.println("学号:"+stunum.substring(6,8));
               
                }
           
        else if(college.equals(stucoll03))
           {
               System.out.println("入学年份:20"+stunum.substring(0,2)+"年");
               System.out.println("学院:外语学院");
               System.out.println("班级:"+stunum.substring(4,6));
               System.out.println("学号:"+stunum.substring(6,8));
               
                }
           else if(college.equals(stucoll20))
           {
               System.out.println("入学年份:20"+stunum.substring(0,2)+"年");
               System.out.println("学院:软件学院");
               System.out.println("班级:"+stunum.substring(4,6));
               System.out.println("学号:"+stunum.substring(6,8));
                }
           else
               
           {  System.out.println("Wrong Format");
               }
     }
    
 }

}

猜猜看有没有一种可能是这个符号中英文的关系