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我有點卡在這一個。我正在編寫一個帶有兩個類的java程序，然後用一個測試程序來測試這個類中的方法。我堅持要在main方法中調用下面的兩個方法。所有的類文件（測試程序類和另外兩個類）正在編譯，並且IDE不會給我任何錯誤消息，計算僅僅不會發生...從主要方法中的類調用方法
- 主要方法代碼：
//Call debit method
System.out.println("Please enter amount to be debited");
double amount=input.nextDouble();
account.debit(amount);
System.out.printf("%.2f%n",balance);
//Call credit method
System.out.println("Please enter amount to be credited");
amount=input.nextDouble();
account.credit(amount);
System.out.printf("%.2f%n",balance);
--account類代碼：
//Method for crediting account balance
public void credit (double amount) {
double newBalance=this.balance+amount;
this.setBalance(newBalance);
}
//Method for debiting account balance
public void debit (double amount) {
if (amount<balance) {
double newBalance=this.balance-amount;
this.setBalance(newBalance);
} else {
System.out.println("Insufficient Funds!");
}
注意：天平二傳手工作，因爲它是在前面的測試程序中調用...
任何幫助非常感激d！
的賬戶類完整代碼：
public class Account {
private int accountId;
private String accountName;
private String accountAddress;
private double balance;
private Bank bank;
//Default Constructor
public Account() {
}
//Getters
public int getAccountId() {
return accountId;
}
public String getAccountName() {
return accountName;
}
public String getAccountAddress() {
return accountAddress;
}
public double getBalance() {
return balance;
}
public Bank getBank() {
return bank;
}
//Setters
public void setAccountId (int accountId) {
if (accountId <=10000000 || accountId >=99999999) {
System.out.println("Invalid Account Id");
} else {
this.accountId=accountId;
}
}
public void setAccountName (String accountName) {
if (accountName.length()>=10) {
System.out.println("Too Long");
} else {
this.accountName=accountName;
}
}
public void setAccountAddress (String accountAddress) {
this.accountAddress=accountAddress;
}
public void setBalance (double balance) {
if (balance<0.0) {
System.out.println("Invalid Balance");
} else {
this.balance=balance;
}
}
public void setBank (Bank bank) {
this.bank=bank;
}
//Constructor to initialize accountId, accountName, accountAddress and Bank
public Account (int accountId, String accountName, String accountAddress, Bank bank) {
this.setAccountId(accountId);
this.setAccountName(accountName);
this.setAccountAddress(accountAddress);
this.setBank(bank);
}
//Method to print out account category based on balance
public void printAccountCategory() {
if (balance<100.0) {
System.out.println("Challenged Account");
} else if (balance>=100.0 && balance<999.9) {
System.out.println("Standard Account");
} else if (balance>=1000.0 && balance<9999.9) {
System.out.println("Promising Account");
} else if (balance>=10000.0 && balance<99999.9) {
System.out.println("Gold Star Account");
} else {
System.out.println("Super Duper Account");
}
}
//Method to project balance based on compound interest and the number of years required
//Note: I took the formula using n (number of times the interest is compounded per year) as 1
public double projectNewBalance (int numberYears) {
if (numberYears>0) {
double interest=1;
for (int i=1; i<=numberYears; i++) {
interest*=(1.0+bank.getInterestRate());
}
double newBalance=balance*interest;
return newBalance;
} else if (numberYears<0) {
System.out.println("Invalid Value");
} else {
return balance;
}
return balance;
}
//Method for crediting account balance
public void credit (double amount) {
double newBalance=this.balance+amount;
this.setBalance(newBalance);
}
//Method for debiting account balance
public void debit (double amount) {
if (amount<balance) {
double newBalance=this.balance-amount;
this.setBalance(newBalance);
} else {
System.out.println("Insufficient Funds!");
}
}
//toString method
public String toString() {
return "Account Id: "+accountId+", Account Name: " + accountName + ", Account Address: "+accountAddress+", Balance: "+balance+", Bank Details: "+bank.toString()+".";
}
}
主要方法全碼：
import java.util.Scanner;
public class BankAccountTest {
public static void main (String [ ] args) {
//Create an instance of the Bank class
Bank bank = new Bank ("WIT Bank", "Paddy Snow", 0.045);
//Create instance of Scanner class
Scanner input=new Scanner(System.in);
//Prompt user to input data to create an account
System.out.println("Please enter an Account ID");
int accountId=input.nextInt();
System.out.println("Please enter an Account Name");
String accountName=input.next();
System.out.println("Please enter an Account Address");
String accountAddress=input.next();
//Create instance of the Account class
Account account = new Account (accountId, accountName, accountAddress, bank);
//Print out details of account class
System.out.println(account);
//Prompt user to enter balance for the account
System.out.println("Please enter account balance");
double balance=input.nextDouble();
account.setBalance(balance);
//Use printAccountCategory method
account.printAccountCategory();
//Call projectNewBalance method
// Note: Method tested with value of 10 years as mentioned in spec,
// but user input also included I think it is more appropriate for the functionality of the program
// int numberYears=10;
// double newBalance1=account.projectNewBalance(numberYears);
// System.out.println(""+newBalance1);
System.out.println("Please enter number of years");
int numberYears=input.nextInt();
double newBalance=account.projectNewBalance(numberYears);
System.out.printf("%.2f%n",newBalance);
//Call debit method
System.out.println("Please enter amount to be debited");
double amount=input.nextDouble();
account.debit(amount);
System.out.printf("%.2f%n",balance);
//Call credit method
System.out.println("Please enter amount to be credited");
amount=input.nextDouble();
account.credit(amount);
System.out.printf("%.2f%n",balance);
}
}
你在哪裏實例化'Account'類的main？當你打印出「balance」時，你應該首先更新來自'account'對象的值。您應該顯示您的課程的完整源代碼。 –
請顯示一個完整的例子。此外，你是編程OO還是程序？如果第二，那麼你必須聲明一切爲靜態。我建議開始在單個（類）文件中將所有文件全部複製並運行快速測試。 –