Question

所以问题出在我的withdraw方法上，出于某种原因，我的代码正在输出：

ADL
826501829
250.0
471.0
Balance is currently:40.0
There aren't enough funds.
There aren't enough funds.

我对Java不太熟悉，因此无法完全理解为什么它没有从IF语句中输出正确的选项

public class BankAcc {

    String accountName;
    int accountNumber;
    float accountOverdraft;
    float currentBalance;

    public BankAcc(String accountName, int accountNumber, float accountOverdraft, float currentBalance) {
        System.out.println(accountName);
        System.out.println(accountNumber);
        System.out.println(accountOverdraft);
        System.out.println(currentBalance);
    }

    public void deposit(float depositAmnt){
        currentBalance = currentBalance + depositAmnt;
        System.out.println("Balance is currently:" + currentBalance);
    }

    public void withdraw(float withdrawAmnt){
        if (withdrawAmnt <= currentBalance){
            currentBalance = currentBalance - withdrawAmnt;
            System.out.println("Balance is currently:" + currentBalance);
        } else {
            System.out.println("There aren't enough funds.");
        }
    }

    public static void main(String []args){
        BankAcc myBankAcc = new BankAcc("ADL",826501829, 250, 471);
        myBankAcc.deposit(40);
        myBankAcc.withdraw(99);
        myBankAcc.withdraw(999);
    }
}

Answer 1

您需要像这样在构造函数中设置属性：

 public BankAcc(String accountName, int accountNumber, float accountOverdraft, float currentBalance) {
    this.accountName = accountName;
    this.accountNumber = accountNumber;
    this.accountOverdraft = accountOverdraft;
    this.currentBalance = currentBalance;
}

“ this”表示您从中访问属性的当前类。

Answer 2

class TransactionType(Enum):

    IN = "IN"
    OUT = "OUT"

    @classmethod
    def choices(cls):
        print(tuple((i.name, i.value) for i in cls))
        return tuple((i.name, i.value) for i in cls)

class TransactionStatus(Enum):

    INITIATED = "INITIATED"
    PENDING = "PENDING"
    COMPLETED = "COMPLETED"
    FAILED = "FAILED"
    ERROR = "ERROR"

    @classmethod
    def choices(cls):
        print(tuple((i.name, i.value) for i in cls))
        return tuple((i.name, i.value) for i in cls)

您打印传递的值，但实际上没有设置它们。

public BankAcc(String accountName, int accountNumber, float accountOverdraft, float currentBalance) {
        System.out.println(accountName);
        System.out.println(accountNumber);
        System.out.println(accountOverdraft);
        System.out.println(currentBalance);
    }

您通过了471，这应该进入currentBalance，但这并不意味着在您存入40并尝试提取99后，您的资金确实不足。

将构造函数更改为：

BankAcc myBankAcc = new BankAcc("ADL",826501829, 250, 471);

Answer 3

您没有保存放入构造函数中的值

public BankAcc(String accountName, int accountNumber, float accountOverdraft, float currentBalance) {
    this.accountName = accountName;
    this.accountNumber = accountNumber;
    this.accountOverdraft = accountOverdraft;
    this.currentBalance = currentBalance;

    System.out.println(accountName);
    System.out.println(accountNumber);
    System.out.println(accountOverdraft);
    System.out.println(currentBalance);
}

Answer 4

您的代码“正常工作”。您正在将存款（40）与99或999进行比较，因此40-99将像“ 40-999”一样“被发现的数量不足”。

我建议您使用getter和setter，因为稍后您对代码会感到困惑。

另一件重要的事情是将值保存在构造函数中。

Java-仅IF语句返回其他子句

4 个答案: