我收到了几乎完成的作业,但是遇到了一个我不知道如何解决的重大问题。我的问题是,当用户输入余额并接受其名称时,但是当存款和取款方法运行时,他们不使用该数据,而是从默认值0开始。
package assignment1;
import java.util.Scanner;
import java.util.ArrayList;
public class TestBank {
public static void main(String[] args) {
Bank bank = new Bank();
bank.enterCustomers();
System.out.println();
System.out.println("==========================");
System.out.println("Opening account balance");
bank.printBalances();
System.out.println();
bank.banking();
System.out.println();
System.out.println("==========================");
System.out.println("Closing account balance");
bank.printBalances();
}
}
class Bank {
String accounts;
Scanner scanner = new Scanner(System.in);
Account account = new Account();
public void enterCustomers() {
ArrayList CustomerDetails = new ArrayList();
while (true) {
System.out.print("Enter Name: ");
account.name = scanner.next();
if (account.name.equals("q")) {
break;
} else {
Input.promptText("Enter balance: ");
account.balance = scanner.nextDouble();
CustomerDetails.add(account.name);
CustomerDetails.add(account.balance);
System.out.println("Enter customer names or q to quit entering names");
}
}
}
public void printBalances() {
System.out.println(account.name + " " + Math.round(account.balance * 100 / 100));
}
public void banking() {
Account account = new Account();
account.deposit();
account.withdraw();
int Newbalance = (int) (Math.round(account.balance));
switch (Newbalance) {
case 1:
account.deposit();
break;
case 2:
account.withdraw();
break;
case 0:
System.exit(0);
default:
break;
}
}
class Account {
private String name;
private double balance;
public Account() {
this.name = name;
this.balance = balance;
}
public String getName() {
return this.name;
}
public double getBalance() {
return this.balance;
}
public double deposit() {
Input.promptText("Enter a valid deposit: ");
double amount = scanner.nextDouble();
balance = balance + amount;
Input.promptText("your balance after your deposit is: " + balance);
return balance;
}
public double withdraw() {
System.out.println();
Input.promptText("Enter a valid withdraw: ");
double amount = scanner.nextDouble();
if (amount > balance); else {
balance = balance - amount;
}
System.out.println("your balance after your withdrawal is: " + balance);
return balance;
}
}
}
class Input {
private static Scanner scanner = new Scanner(System.in);
public static String getText() {
return scanner.nextLine();
}
public static String getText(String prompt) {
System.out.print(prompt);
return scanner.nextLine();
}
public static String getString() {
return scanner.nextLine();
}
public static String getString(String prompt) {
System.out.print(prompt);
return scanner.nextLine();
}
public static double getDouble() {
return scanner.nextDouble();
}
public static double getDouble(String prompt) {
System.out.print(prompt);
return scanner.nextDouble();
}
public static void promptText(String text) {
System.out.printf("%s", text);
}
public static void outputText(String text) {
System.out.printf("%s\n", text);
}
public static void outputInteger(String text, int value) {
System.out.printf("%s%d\n", text, value);
}
public static void outputDouble(String text, double value) {
outputDouble(text, value, 2);
}
public static void outputDouble(String text, double value, int decimalPlaces) {
System.out.printf("%s%." + decimalPlaces + "f\n", text, value);
}
public static void outputBoolean(String text, boolean value) {
System.out.printf("%s%b\n", text, value);
}
}
我又如何做到这一点,例如,输入的名称是John,输入的是300。然后添加了另一个名称,例如输入400的亚当,以便打印约翰斯余额= 300,输入亚当斯= 400
答案 0 :(得分:1)
您的错误在于banking()方法。您正在创建新帐户并对其进行操作,而不是先前创建的帐户。
public void banking() {
// remove the below line
// Account account = new Account();
account.deposit();
account.withdraw();
int Newbalance = (int) (Math.round(account.balance));
switch (Newbalance) {
case 1:
account.deposit();
break;
case 2:
account.withdraw();
break;
case 0:
System.exit(0);
default:
break;
}
}
以下是输出:
Enter Name: test
Enter balance: 500
Enter customer names or q to quit entering names
Enter Name: q
==========================
Opening account balance
q 500
Enter a valid deposit: 100
your balance after your deposit is: 600.0
Enter a valid withdraw: 50
your balance after your withdrawal is: 550.0
==========================
Closing account balance
q 550
另一个错误是您正在使用帐户name != q
时从输入中获取帐户,但是您使用的是最后一个帐户。您仅存储一个帐户,而不是全部。在上面,它应该在帐户test
上运行,而应在帐户q
上运行。
因此,要对其进行修复,您应该修复enterCustomers()方法:
public void enterCustomers() {
ArrayList CustomerDetails = new ArrayList();
while (true) {
System.out.print("Enter Name: ");
// account.name = scanner.next();
// don't set input directly to account
String inputName = scanner.next();
// check given input
if (inputName.equals("q")) {
break;
} else {
Input.promptText("Enter balance: ");
account.name = inputName;
account.balance = scanner.nextDouble();
CustomerDetails.add(account.name);
CustomerDetails.add(account.balance);
System.out.println("Enter customer names or q to quit entering names");
}
}
}
现在的输出是:
Enter Name: test
Enter balance: 500
Enter customer names or q to quit entering names
Enter Name: q
==========================
Opening account balance
test 500
Enter a valid deposit: 100
your balance after your deposit is: 600.0
Enter a valid withdraw: 50
your balance after your withdrawal is: 550.0
==========================
Closing account balance
test 550