【发布时间】：2013-05-19 04:25:39
【问题描述】：
到目前为止，我已经创建了两个类，我将在下面展示它们
我已经测试了这两个类，它们似乎都可以工作。
我现在需要创建一个菜单，该菜单将使用我创建的两个类，并允许用户输入信息并在他们的帐户中查找以下信息：
- 添加客户详细信息
- 向企业账户存款
- 将抄表记录到企业帐户
- 显示企业账户的当前余额
- 显示完整的帐户详细信息
- 更改企业帐户的折扣值
- 更改所有企业帐户的单位成本
- 如何使用菜单系统
虽然我已尽力了解如何使用在线资源来做到这一点，但我现在迷路了。到目前为止，每次我试图创建一个菜单系统时，我都无法让它工作。如果有人能帮助我了解如何做的基础知识，我将不胜感激。
谢谢:)
public class GasAccount
{
private int intAccRefNo;
private String strName;
private String strAddress;
public double dblBalance;
private double dblUnits;
public static double dblUnitsCosts = 0.02;
public GasAccount (int intNewAccRefNo , String strNewName , String strNewAddress)
{
}
public GasAccount (int intNewAccRefNo , String strNewName , String strNewAddress , double dblNewUnits)
{
intAccRefNo = intNewAccRefNo;
strName = strNewName;
strAddress = strNewAddress;
dblUnits = dblNewUnits;
dblBalance = dblUnits * dblUnitsCosts;
}
public int getAccRefNo()
{
return intAccRefNo;
}
public String getName()
{
return strName;
}
public String getAddress()
{
return strAddress;
}
public void deposit(double dblDepositAmount)
{
dblBalance = dblBalance - dblDepositAmount;
}
public double getBalance()
{
return dblBalance;
}
public double getUnitCost()
{
return dblUnitsCosts;
}
public void recordUnits (double dblUnitsUsed)
{
dblBalance = dblBalance + dblUnitsUsed * dblUnitsCosts;
dblUnits = dblUnitsUsed + dblUnits;
}
public double getUnits()
{
return dblUnits;
}
public void updateUnitsCosts(double dblNewUnitsCosts)
{
this.dblUnitsCosts = dblNewUnitsCosts;
}
}
还有一个扩展它的 -
public class BusinessAccount extends GasAccount
{
private double dblDiscount;
public BusinessAccount (int intNewAccRefNo, String strNewName, String strNewAddress, double dblNewUnits, double dblNewDiscount)
{
super (intNewAccRefNo , strNewName , strNewAddress, dblNewUnits);
dblDiscount = dblNewDiscount;
}
public void setNewDiscount(double dblNewDiscount)
{
dblDiscount = dblNewDiscount;
}
public double getDiscount()
{
return dblDiscount;
}
@Override
public void recordUnits (double dblUnitsUsed)
{
double dblNewBalance;
dblBalance = dblBalance + dblUnitsUsed * dblUnitsCosts;
dblNewBalance = dblUnitsUsed * dblUnitsCosts * dblDiscount / 100;
dblBalance = dblBalance - dblNewBalance;
}
这是我尝试的菜单直到第五个选项的样子。我在调用其他类的方法时做错了什么，因为 BuisnessAccount.getMethod 总是显示为错误。我也很确定再次声明变量是完全错误的，因为它们与我的其他类没有链接。
如果有人能帮我解决这个问题，将不胜感激
import java.util.Scanner;
public class Menu
{
public static void main(String [] args)
{
Scanner input = new Scanner(System.in);
int Choice;
{
System.out.println("------------------------------");
System.out.println ( "1. Add the customers details" ) ;
System.out.println ( "2. Make a deposit to the business account" );
System.out.println ( "3. Record a meter reading to the business account" ) ;
System.out.println ( "4. Display current balance of the business account" ) ;
System.out.println ( "5. Display full account details" ) ;
System.out.println ( "6. Change the discount value for the business account" ) ;
System.out.println ( "7. Change the cost per unit for all business accounts ");
System.out.println ( "8. How to use the menu system ");
System.out.println ( "Any other number will exit the program");
System.out.println("------------------------------");
System.out.println ( "\n\nEnter a number from 1 to 8" );
Choice = input.nextInt();
switch (Choice)
{
case 1 :
int intNewAccRefNo;
String strNewName;
String strNewAddress;
Double dblNewUnits;
Double dblNewDiscount;
System.out.println("Please enter the account number?");
intNewAccRefNo = input.nextInt();
System.out.println("Please enter the account name?");
input.nextLine();
strNewName = input.nextLine();
System.out.println("Please enter the account address?");
strNewAddress = input.nextLine();
System.out.println("Please enter the number of initial number of units used?");
dblNewUnits = input.nextDouble();
System.out.println("Please enter the discount?");
dblNewDiscount = input.nextDouble();
case 2:
double dblDeposit;
System.out.println("Please enter the amount you want to deposit?");
dblDeposit = input.nextDouble();
System.out.println ( "The current balance: " + BusinessAccount.getBalance() ) ;
case 3:
double dblUnits;
System.out.println("Enter the number of Units Used");
dblUnits = input.nextDouble();
BusinessAccount.recordUnits(dblUnits);
case 4:
System.out.println("\n Current Balance: £"+ BusinessAccount.getBalance());
case 5:
System.out.println("Account Reference Number: " + BusinessAccount.getAccRefNo());
System.out.println("Address: " + BusinessAccount.getAddress());
System.out.println("Name: " + BusinessAccount.getName());
System.out.println("Balance: " + BusinessAccount.getBalance());
System.out.println("Discount: " + BusinessAccount.getDiscount());
System.out.println("Units: " + BusinessAccount.getUnits());
case 1 :
String strAddress;
System.out.println("Please enter the account address?");
strAddress = input.nextLine();
System.out.println("Address:" + firstAccount.getAddress());
用户输入的内容与我调用的方法之间没有联系，不知道如何解决。
【问题讨论】：