我正在开发一个有5个班级的项目。其中一个是验证类。我验证了控件类中的数据，但教授希望它在一个单独的类中。 这是我的代码示例。用户在令牌中输入信息。运行正常，但在控制器类中，我应该“调用”具有自己的类的验证。我该怎么编码呢？
while (tkCustomer.hasMoreTokens()){
//store each token in the corresponding variable
//Make sure we format integers
//variablename = tkCustomer.nextToken();
firstName = tkCustomer.nextToken( );
lastName = tkCustomer.nextToken ( );
phone = tkCustomer.nextToken ( );
nbrVehicle = Integer.parseInt(tkCustomer.nextToken( ));
nbrTanks = Integer.parseInt(tkCustomer.nextToken( ));
}
//validate each data entered here
int firstNameLength = firstName.length();
if(firstNameLength == 0){
String errorMessage = "Please Enter a Valid First Name";
JOptionPane.showMessageDialog(null, errorMessage, "Invalid Name", JOptionPane.ERROR_MESSAGE);
System.exit(0);
}else{
int lastNameLength = lastName.length();
if(lastNameLength == 0){
String errorMesssage = "Please Enter a Valid Last Name";
JOptionPane.showMessageDialog(null, errorMesssage, "Invalid Name", JOptionPane.ERROR_MESSAGE);
System.exit(0);
}else{
int phoneLength = phone.length();
if(phoneLength != 10) {
String errorMesssage = "Please Enter a Valid Phone Number";
JOptionPane.showMessageDialog(null, errorMesssage, "Invalid Phone Number", JOptionPane.ERROR_MESSAGE);
System.exit(0);
}else{
if(nbrVehicle < 1 || nbrVehicle > 10) {
String errorMesssage = "Please Enter a Number Between 1 & 10 for Your Order of Vehicles";
JOptionPane.showMessageDialog(null, errorMesssage, "Invalid Vehicle Order", JOptionPane.ERROR_MESSAGE);
System.exit(0);
}else{
if(nbrTanks != 2 && nbrTanks != 4 && nbrTanks != 8 && nbrTanks != 10 && nbrTanks != 15 && nbrTanks != 20){
String errorMesssage = "Please Enter Either 2, 4, 8, 10, 15, or 20 for Your Order of Tanks";
JOptionPane.showMessageDialog(null, errorMesssage, "Invalid Number of Tanks", JOptionPane.ERROR_MESSAGE);
System.exit(0);
}
}
}
}
}
此外，一旦用户选择了给予他们的特定选项，程序就会崩溃。控件类的完整代码如下。 DUring第一轮tokenizer项目程序运行正常。在第二轮之后程序崩溃，给我这个错误：
线程“main”java.util.NoSuchElementException中的异常 at java.util.StringTokenizer.nextToken（StringTokenizer.java:349） 在project3example.HayloFactoryController.main（HayloFactoryController.java:126）
我已尝试过“while has more token”方法，但只是将程序发送到无限循环，只能使用停止按钮终止。
这是控件类的完整代码：
package project3example;
import java.util.StringTokenizer;
导入javax.swing.JOptionPane;
公共类HayloFactoryController {/**
* @param args
*/
public static void main(String[] args) {
//create variables to hold information collected from the user
String firstName = null;
String lastName = null;
String phone = "";
int nbrTanks = 0;
int nbrVehicle = 0;
double total = 0;
do{
//collect the data entered by the user in
//variables
String customerMessage = "Please enter the following separated by spaces"
+ "\n\n"
+ "- Customer First Name\n"
+ "- Customer Last Name\n"
+ "- Customer Phone\n"
+ "- Number of Vehicles\n"
+ "- Number of Tanks"
+ "\n\n"
+ "Example: Homer Simpson 9094559384 5 8\n\n"
;
StringTokenizer tkCustomer = new StringTokenizer(
JOptionPane.showInputDialog(customerMessage));
while (tkCustomer.hasMoreTokens()){
//store each token in the corresponding variable
//Make sure we format integers
//variablename = tkCustomer.nextToken();
firstName = tkCustomer.nextToken( );
lastName = tkCustomer.nextToken ( );
phone = tkCustomer.nextToken ( );
nbrVehicle = Integer.parseInt(tkCustomer.nextToken( ));
nbrTanks = Integer.parseInt(tkCustomer.nextToken( ));
}
//validate each data entered here
int firstNameLength = firstName.length();
if(firstNameLength == 0){
String errorMessage = "Please Enter a Valid First Name";
JOptionPane.showMessageDialog(null, errorMessage, "Invalid Name", JOptionPane.ERROR_MESSAGE);
System.exit(0);
}else{
int lastNameLength = lastName.length();
if(lastNameLength == 0){
String errorMesssage = "Please Enter a Valid Last Name";
JOptionPane.showMessageDialog(null, errorMesssage, "Invalid Name", JOptionPane.ERROR_MESSAGE);
System.exit(0);
}else{
int phoneLength = phone.length();
if(phoneLength != 10) {
String errorMesssage = "Please Enter a Valid Phone Number";
JOptionPane.showMessageDialog(null, errorMesssage, "Invalid Phone Number", JOptionPane.ERROR_MESSAGE);
System.exit(0);
}else{
if(nbrVehicle < 1 || nbrVehicle > 10) {
String errorMesssage = "Please Enter a Number Between 1 & 10 for Your Order of Vehicles";
JOptionPane.showMessageDialog(null, errorMesssage, "Invalid Vehicle Order", JOptionPane.ERROR_MESSAGE);
System.exit(0);
}else{
if(nbrTanks != 2 && nbrTanks != 4 && nbrTanks != 8 && nbrTanks != 10 && nbrTanks != 15 && nbrTanks != 20){
String errorMesssage = "Please Enter Either 2, 4, 8, 10, 15, or 20 for Your Order of Tanks";
JOptionPane.showMessageDialog(null, errorMesssage, "Invalid Number of Tanks", JOptionPane.ERROR_MESSAGE);
System.exit(0);
}
}
}
}
}
//Create a customer Object
//CustomerObject variableName = new CustomerObject(arguments)
HayloCustomer customer = new HayloCustomer (firstName, lastName, phone, nbrVehicle, nbrTanks, total);
//Present the customer with a choice of vehicles
String[] choices = {"EV-EX 4", "EV-EX 6", "EV-DX 9", "EV-DX 12", "EV-SX 13"};
int response = JOptionPane.showOptionDialog(
null // center over parent
, "Select a Vehicle type and Number of Fuel Cells" // message
, "Vehicle & Fuel Cell Selection" // title in title bar
, JOptionPane.YES_NO_OPTION // Option type
, JOptionPane.PLAIN_MESSAGE // messageType
, null // icon
, choices // Options
, "APS 24" // initial value
);
//get the selection from the customer
StringTokenizer tkVehicle= new StringTokenizer(choices[response]);
//populate the vehicle variables
String vehicleType;
int nbrCells;
int costVehicle;
int tankCost;
//while (tkVehicle.hasMoreTokens());
vehicleType = tkVehicle.nextToken();
nbrCells = Integer.parseInt(tkVehicle.nextToken());
costVehicle = Integer.parseInt(tkVehicle.nextToken());
tankCost = Integer.parseInt(tkVehicle.nextToken());
//Create our vehicle object
//VehicleObject variableName = new VehicleObject(arguments)
HayloVehicle vehicleFactory = new HayloVehicle(vehicleType, nbrCells, costVehicle, tankCost);
//Create our factory object
//FactoryObject factoryVariableName = new FactoryObject(customerObjectVariable, vehicleObjectVariable);
HayloFactory factory = new HayloFactory(customer, vehicleFactory);
//ask the object to process the order
//factoryVariableName.process();
customer.toString();
vehicleFactory.toString();
factory.process();
factory.toString();
//write code below to display the result for each order
JOptionPane.showMessageDialog(null, factory.getSummary());
}while (JOptionPane.showConfirmDialog(null, "Enter More Orders?") == JOptionPane.YES_OPTION);
//write code below to display the summary for all the orders
JOptionPane.showMessageDialog(null, HayloFactory.salesSummary());
}
}
非常感谢任何帮助！初学者，在线等级！
答案 0 :(得分：0)
最简单的方法是在一个方法中写出一个带有验证逻辑的类，该方法将一个客户对象（填充字符串标记生成器中的字段）作为参数并将其传递给方法。验证可以在方法中完成，并指定一些错误代码/成功代码以从验证返回并显示错误或成功（如果适用）。还有很多其他的设计方法，但这可能是最快的。