简单Java异常处理实践案例

原创淩亂°似流年 2024-11-28 09:51 108阅读 0赞

在Java编程中，异常处理是一种防止程序因为意外条件而停止正常运行的机制。以下是一个简单的Java异常处理实践案例：

```java
public class BankAccount {

private double balance;

// 构造器，初始化账户余额
    public BankAccount(double initialBalance) {
        if (initialBalance < 0) {
            throw new IllegalArgumentException("Initial balance cannot be negative.");
        }
        this.balance = initialBalance;
    }

// 方法，用于增加账户余额
    public void deposit(double amount) {
        if (amount < 0) {
            throw new IllegalArgumentException("Deposit amount cannot be negative.");
        }
        this.balance += amount;
    }

// 方法，用于减少账户余额
    public void withdraw(double amount) {
        if (amount < 0 || this.balance - amount < 0) {
            throw new IllegalArgumentException("Withdrawal amount exceeds available balance or is negative.");
        }
        this.balance -= amount;
    }

// 获取当前账户余额
    public double getBalance() {
        return this.balance;
    }
}

// 使用示例
public class BankAccountExample {

public static void main(String[] args) {
        try {
            BankAccount account = new BankAccount(100);
            account.deposit(50);
            System.out.println("Withdrawal amount: " + 25); // Should be allowed

// Attempt to withdraw more than available balance
            account.withdraw(300);

} catch (IllegalArgumentException e) {
            System.err.println("Error: " + e.getMessage());
        }
    }
}
```

这个例子中，我们创建了一个银行账户并执行存款和尝试提取超出余额的操作。当提取金额超过账户余额时，程序会捕获`IllegalArgumentException`异常，并输出错误信息。