Java中异常链和自定义异常设计示例

原创 ╰+哭是因爲堅強的太久メ 2024-09-22 00:15 68阅读 0赞

在Java中，异常处理主要通过try-catch-finally语句块实现。以下是异常链和自定义异常的设计示例：

1. 异常链设计：
```java
public class BankAccount {
    private String accountNumber;
    private double balance;

// Account operations
    public void deposit(double amount) throws InsufficientBalanceException {
        if (amount > balance) {
            throw new InsufficientBalanceException("Insufficient balance for deposit.");
        }
        balance += amount;
    }

public void withdraw(double amount) throws InsufficientBalanceException, InvalidWithdrawalAmountException {
        if (amount < 0) {
            throw new InvalidWithdrawalAmountException("Invalid withdrawal amount: Negative value.");
        } else if (withdrawalAmount > balance) {
            throw new InsufficientBalanceException("Insufficient balance for withdraw.");
        }
        balance -= amount;
    }

// Exception handling
    public void handleAccountOperationError(Exception e) throws AccountErrorException {
        if (e instanceof InsufficientBalanceException || 
                e instanceof InvalidWithdrawalAmountException) {
            throw new AccountErrorException(e.getMessage());
        } else {
            System.out.println("Unknown error occurred: " + e.getMessage());
            throw new AccountErrorException("An unknown error occurred.");
        }
    }
}
```
2. 自定义异常设计：
```java
// 示例自定义异常
public class CustomAccountError extends Exception {
    public CustomAccountError(String message) {
        super(message);
    }
}
```
在这两个示例中，我们创建了银行账户类，其中包含存款、取款等操作。同时，我们也设计了一个自定义的异常`CustomAccountError`。

在实际使用中，你可以根据需要修改这些示例，以满足你的项目需求。