老师要求写一个图书管理系统，在管理员注册时要求输入id,姓名,性别，年龄,家庭住址等信息，在输入姓名时要求不能为空，输入空则提示重新输入，输入字符则继续输入其他信息。

我觉得逻辑很简单，但是自己就卡在这里了，百度了几个方法都没有成功，所以来求教各位大牛，拜托！

这里设置了管理员属性，一个空构造和含参构造，其中还有各个属性的set、get、toString方法，这里省略了。publicclassAdministrator{publicstaticvoidmain(String[] args){ List l =newArrayList(); Administrator a =newAdministrator(); String str = a.toString(); l.add(str); System.out.println(l); System.out.println(str); }privateintadminId;//IDprivateString adminRealName;//姓名privateString adminSex;//性别privateintadminAge;//年龄privateString adminAddress;//家庭住址privateintadminPhoneNumber;//电话号码privateString adminLoginName;//登录名privateString adminLonginPassword;//登录密码privateintadminState;//状态1/2/3publicAdministrator(){ }publicAdministrator(intadminId, String adminRealName, String adminSex,intadminAge, String adminAddress,intadminPhoneNumber, String adminLoginName, String adminLonginPassword,intadminState){ super();this.adminId = adminId;this.adminRealName = adminRealName;this.adminSex = adminSex;this.adminAge = adminAge;this.adminAddress = adminAddress;this.adminPhoneNumber = adminPhoneNumber;this.adminLoginName = adminLoginName;this.adminLonginPassword = adminLonginPassword;this.adminState = adminState; }}

注册时输入各项信息，姓名设置不能为空publicclassRegister{publicstaticvoidmain(String[] args){ }publicstaticvoidregister(){ Administrator a =newAdministrator();//空构造System.out.println("Please register now...");//提示：开始注册Scanner s =newScanner(System.in);//新建扫描器//Id:用户输入，但是不能有相同，而且只能是数字System.out.println("setAdminId:");//设置管理员IDa.setAdminId(s.nextInt());//姓名:不能为空for(inti =0; i <1; ) {while(true) { System.out.println("setAdminRealName:"); String AdminRealName = s.next();if(AdminRealName.length() <1) { System.out.println("不能为空！"); i--;break; } }break; }//性别:必填，只能是男或女System.out.println("setAdminSex:"); a.setAdminSex(s.next()); System.out.println("registed!"); System.out.println(a.toString()); s.close(); }}