场景说明： 设计一个简单的银行账户类，包含以下基本方法： 开户：用户可以通过构造函数或特定的方法（如openaccount）来开设一个新账户，需要设置账户的初始余额（默认为0）。 存款：提供一个deposit方法，获取该账户，允许用户向账户中存入一定金额。 取款：提供一个withdraw方法，允许用户从账户中取出一定金额，但需要注意账户余额不能小于取款金额，否则应抛出余额不足异常。 查询余额：提供一个getbalance方法，用于返回当前账户的余额。 你需要在c或java代码里做如下几件事： 1、实现上述功能的bankaccount类。 2、并写一个测试类bankaccounttest，写4个测试方法，都放到main里面，一次性分别按如下顺序执行： 方法①开户-存款20-取款19.89-查询余额 方法②开户-存款20-取款21.01-查询余额 方法③存款20-开户-取款19.89-查询余额 方法④取款20-开户-存款20.01-查询余额 用于验证bankaccount类的各个功能是否按预期工作，①②③④方法为连贯执行，每一个方法执行完，恢复初始状态，②开始执行，以此类推。 相关执行结

根据你的需求，我将提供一个Java版本的实现。首先，我们定义`BankAccount`类，然后创建一个测试类`BankAccountTest`来验证各种情况下的行为。 1. BankAccount 类 ```java public class BankAccount { private double balance; public BankAccount(double initialBalance) { this.balance = initialBalance; } public void deposit(double amount) { if (amount > 0) { balance += amount; } } public boolean withdraw(double amount) throws Exception { if (amount > 0 && balance >= amount) { balance -= amount; return true; } else if (balance < amount) { throw new Exception("Insufficient funds"); } return false; } public double getBalance() { return balance; } } ``` 2. BankAccountTest 类 ```java public class BankAccountTest { public static void main(String[] args) { testMethod1(); reset(); testMethod2(); reset(); testMethod3(); reset(); testMethod4(); } private static BankAccount account; private static void reset() { account = new BankAccount(0); } private static void testMethod1() { System.out.println("Starting Test Method 1:"); account = new BankAccount(0); account.deposit(20); try { account.withdraw(19.89); System.out.println("Withdraw successful."); } catch (Exception e) { System.out.println("Withdraw failed: " + e.getMessage()); } System.out.println("Current Balance: " + account.getBalance()); } private static void testMethod2() { System.out.println("\nStarting Test Method 2:"); account = new BankAccount(0); account.deposit(20); try { account.withdraw(21.01); System.out.println("Withdraw successful."); } catch (Exception e) { System.out.println("Withdraw failed: " + e.getMessage()); } System.out.println("Current Balance: " + account.getBalance()); } private static void testMethod3() { System.out.println("\nStarting Test Method 3:"); account.deposit(20); // This will not set the balance since account is not created yet. account = new BankAccount(0); try { account.withdraw(19.89); System.out.println("Withdraw successful."); } catch (Exception e) { System.out.println("Withdraw failed: " + e.getMessage()); } System.out.println("Current Balance: " + account.getBalance()); } private static void testMethod4() { System.out.println("\nStarting Test Method 4:"); try { account.withdraw(20); // This will fail because the account is not created yet. System.out.println("Withdraw successful."); } catch (Exception e) { System.out.println("Withdraw failed: " + e.getMessage()); } account = new BankAccount(0); account.deposit(20.01); try { account.withdraw(19.89); System.out.println("Withdraw successful."); } catch (Exception e) { System.out.println("Withdraw failed: " + e.getMessage()); } System.out.println("Current Balance: " + account.getBalance()); } } ``` 解释 1. BankAccount 类实现了基本的银行账户功能，包括存款、取款和获取余额。 2. BankAccountTest 类包含了四个测试方法，每个方法都按照指定的顺序执行操作，并打印结果。 3. reset 方法 在每个测试方法之间重置账户状态。 4. 异常处理 在取款时检查余额是否足够，并在余额不足时抛出异常。 这个示例应该能帮助你理解和实现所需的功能。 [2024-08-06 18:52:51 | AI写代码神器 | 837点数解答]