老师，请问如下代码为何无法实现图示效果？isEmpty()方法应如何使用？

case 4://输入班级的语文成绩
    System.out.println("请输入要输入语文成绩的班级名称");
    String input8 = sc.next();
    Banji banji3 = school.searchByName(input8);
    if (banji3 == null) {
        System.out.println("该班级不存在");
        continue;
    } else {
        List<Student> list1 = banji3.getStuList();
        if (list1.isEmpty()) {
            System.out.println("还未添加学生信息")；
            continue;
        } else {
            for (int i = 0; i < list1.size(); i++) {
                String stuNum = list1.get(i).getStuNum();
                System.out.println("请输入学号为" + stuNum + "的学生语文成绩");
                try {
                    float scoreChinese = sc.nextFloat();
                    banji3.insertChineseScore(stuNum, scoreChinese);
                } catch (InputMismatchException e) {
                    System.out.println("不能输入非数字，请重新输入");
                    sc.next();
                    continue;
                }
            }
        }
    }