我收到了一份即将完成的作业，但是我遇到了一个我不知道如何解决的重大问题。我的问题是，当用户输入余额和名称时，它接受它，但是当存款和取款方法运行时，它们不使用该数据，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);
}
}
另外，我怎样才能做到这一点，例如，输入的名字是 John，输入是 300。然后添加另一个名字，比如 Adam，输入 400，这样它就会打印 Johns 余额 = 300，Adams 输入 = 400
最佳答案
你的错误是在banking()方法中。您正在创建新帐户并对其进行操作，而不是在以前创建的帐户上。
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;
}
}
这是输出:
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
另一个错误是您在帐户 name != q 时从输入中获取帐户，但您正在对最后一个帐户进行操作。您只存储一个帐户，而不是全部。在上面，它应该在帐户 test 上操作，但它是在帐户 q 上操作。
因此，要修复它，您应该修复您的 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
关于java - 方法未使用正确的解析输入，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/52464688/