简化Java异常处理：实战示例-蒲公英云

简化Java异常处理：实战示例

原创小咪咪 2024-11-28 06:21 71阅读 0赞

Java异常处理是编写健壮代码的关键部分。以下是一个简单且实用的Java异常处理示例：

public class BankAccount {
    private double balance;
    // 构造函数，初始化账户余额
    public BankAccount(double initialBalance) {
        if (initialBalance < 0) { // 检查输入是否合理
            throw new IllegalArgumentException("Initial balance cannot be negative.");
        }
        this.balance = initialBalance;
    }
    // 提供一个方法来增加账户余额
    public void deposit(double amount) {
        if (amount <= 0) { // 再次检查输入是否合理
            throw new IllegalArgumentException("Deposit amount must be positive.");
        }
        balance += amount;
        System.out.println("Account balance updated to: " + balance);
    }
    // 提供一个方法来减少账户余额
    public void withdraw(double amount) {
        if (amount <= 0 || amount > balance) { // 再次检查输入是否合理以及账户余额是否足够
            throw new IllegalArgumentException("Withdrawal amount must be positive and less than or equal to current balance.");
        }
        balance -= amount;
        System.out.println("Account balance updated to: " + balance);
    }
    // 主函数，演示如何使用异常处理
    public static void main(String[] args) {
        BankAccount account = new BankAccount(100); // 创建一个初始余额为100的账户
        try { // 异常处理开始
            account.deposit(50); // 向账户存款50元
            account.withdraw(20); // 从账户中取出20元
        } catch (IllegalArgumentException e) { // 检查是否抛出异常
            System.out.println("Error: " + e.getMessage()); // 输出错误信息
        } finally {
            System.out.println("Account balance after operations: " + account.balance);
        }
    }
}