Java/com/study/demo7/BankWithdraw.java

package com.study.demo7;

// 自定义异常
class InsufficientBalanceException extends Exception {
  public InsufficientBalanceException(String message) {
    super(message);
  }
}

// 账户类
class Account {
  private double balance;

  public Account(double balance) {
    this.balance = balance;
  }

  public void withdraw(double amount) throws InsufficientBalanceException {
    if (amount > balance) {
      throw new InsufficientBalanceException("余额不足，当前余额: " + balance);
    }
    balance -= amount;
    System.out.println("取款成功，剩余余额: " + balance);
  }
}

// 主类
public class BankWithdraw {
  public static void main(String[] args) {
    Account account = new Account(1000.0);
    try {
      account.withdraw(100.0);
    } catch (InsufficientBalanceException e) {
      System.out.println("取款失败: " + e.getMessage());
    }
  }
}