我写的Java学生成绩管理系统源代码

我写的Java学生成绩管理系统源代码(5)             }break;
            case 3: {//3.删除数据
                long deleteNumber = 0;
                System.out.print("请输入你想删除的同学的学号:");
                BufferedReader bf =
                    new BufferedReader (
                            new InputStreamReader(System.in));
                String inputL = bf.readLine();
                deleteNumber = Integer.valueOf(inputL).longValue();
                lp.deleteData(deleteNumber);
                if(isDelete)
                System.out.println("删除数据成功!");
                timeOut(1);
            }break;
            case 4: {  
                lp.clearData();//4.清除所有数据
                timeOut(1);
            }break;