Java异常处理及捕获的实战案例

原创妖狐艹你老母 2024-11-26 13:15 8阅读 0赞

在Java编程中，异常处理是用于管理程序运行过程中可能产生的错误情况的一种机制。以下是一个关于Java异常处理和捕获的实战案例：

```java
public class BankAccount {

private String accountNumber;
    private double balance;

// 构造函数
    public BankAccount(String accountNumber, double initialBalance) {
        this.accountNumber = accountNumber;
        this.balance = initialBalance;
    }

// 方法：存款
    public void deposit(double amount) throws InsufficientFundsException {
        if (amount < 0) {
            throw new IllegalArgumentException("Deposit amount cannot be negative.");
        }
        
        balance += amount;
    }

// 方法：取款，包括检查账户余额
    public void withdraw(double amount) throws InsufficientFundsException, InvalidWithdrawalAmountException {
        if (amount <= 0) {
            throw new IllegalArgumentException("Withdrawal amount cannot be zero or negative.");
        }
        
        double requiredBalance = amount + this.balance;

// 检查是否足以进行取款
        if (requiredBalance > this.balance) {
            throw new InsufficientFundsException("Insufficient funds for withdrawal. Required balance: " + requiredBalance);
        }

// 取款成功，减少账户余额
        this.balance -= amount;
    }
}

// 测试代码
public class BankAccountTest {

public static void main(String[] args) {
        try {
            BankAccount bankAccount = new BankAccount("123456", 100.0);
            
            // 存款
            bankAccount.deposit(50.0); // 余额变为150.0

// 取款，检查是否足够以及捕获异常
            double amountToWithdraw = 25.0;
            if (bankAccount.withdraw(amountToWithdraw)) {
                System.out.println("Withdrawal successful. Remaining balance: " + bankAccount.balance);
            } else {
                System.out.println("Error withdrawing funds. Exception message: " + bankAccount.lastExceptionMessage());
            }
        } catch (InsufficientFundsException | InvalidWithdrawalAmountException e) {
            System.out.println("Error occurred during financial operations. Exception message: " + e.getMessage());
        }
    }
}
```

这个案例中，我们创建了一个`BankAccount`类，它包含了存款（`deposit`）和取款（`withdraw`）的方法。在测试代码部分，我们进行了正常的操作，包括存款和尝试取出金额不足的款项。如果出现异常，我们将捕获并打印异常信息。