从另一个类 JAVA 调用验证

Question

我正在处理一个有 5 个类的项目。其中之一是验证类。我在对照类中验证了数据，但教授希望在单独的类中使用它。这是我的代码示例。用户在令牌中输入信息。运行良好，但在控制器类中，我应该"调用"具有自己的类的验证。我应该如何编码？

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);
             }
        }
        }
        }
        }

但是，一旦用户选择了提供给他们的某个选项，程序就会崩溃。 下面是控件类的完整代码。DU第一轮分词器项目程序运行良好。第二轮后，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( 在项目3示例中。HayloFactoryController.main(HayloFactoryController.java：126(

我已经尝试了"虽然有更多的令牌"方法，但这只会将程序发送到一个无限循环中，并且只能通过停止按钮终止。

下面是控件类的完整代码：

package project3example;

import java.util.StringTokenizer;

import javax.swing.JOptionPane;

public class 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"
            + "nn"
            + "- Customer First Namen"
            + "- Customer Last Namen"
            + "- Customer Phonen"
            + "- Number of Vehiclesn"
            + "- Number of Tanks"
            + "nn"
            + "Example: Homer Simpson 9094559384 5 8nn"
            ;
        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()); 
}

}

任何帮助将不胜感激！初学者在这里，成绩在线！

Answer 1

最简单的方法是在方法中写出一个具有验证逻辑的类，该方法将客户对象作为其参数(从字符串分词器填充字段(并将其传递给该方法。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(。还有许多其他设计方法，但这可能是最快的。