19.编写一个程序，模拟银行转账过程，处理可能的余额不足异常。
下面是一个简单的Java程序，用于模拟银行转账过程，并处理可能的余额不足异常。
首先，我们定义一个BankAccount类，该类包含账户的基本信息（如账户名和余额）以及一个transfer方法用于转账。如果转账导致余额不足，transfer方法将抛出InsufficientBalanceException异常。
然后，我们定义一个InsufficientBalanceException类，该类继承自Exception类，用于表示余额不足的异常情况。
最后，我们在Main类中创建两个BankAccount对象，并模拟转账过程。
java复制代码
|---|----------------------------------------------------------------------------------------------------|
| | // BankAccount.java |
| | public class BankAccount { |
| | private String name; |
| | private double balance; |
| | |
| | public BankAccount(String name, double balance) { |
| | this.name = name; |
| | this.balance = balance; |
| | } |
| | |
| | public void deposit(double amount) { |
| | this.balance += amount; |
| | } |
| | |
| | public void withdraw(double amount) throws InsufficientBalanceException { |
| | if (amount > balance) { |
| | throw new InsufficientBalanceException("Insufficient balance in account " + name); |
| | } |
| | this.balance -= amount; |
| | } |
| | |
| | public void transfer(BankAccount receiver, double amount) throws InsufficientBalanceException { |
| | withdraw(amount); |
| | receiver.deposit(amount); |
| | } |
| | |
| | public String getName() { |
| | return name; |
| | } |
| | |
| | public double getBalance() { |
| | return balance; |
| | } |
| | } |
| | |
| | // InsufficientBalanceException.java |
| | public class InsufficientBalanceException extends Exception { |
| | public InsufficientBalanceException(String message) { |
| | super(message); |
| | } |
| | } |
| | |
| | // Main.java |
| | public class Main { |
| | public static void main(String[] args) { |
| | BankAccount account1 = new BankAccount("Alice", 1000); |
| | BankAccount account2 = new BankAccount("Bob", 500); |
| | |
| | try { |
| | account1.transfer(account2, 600); // Alice transfers 600 to Bob |
| | System.out.println("Transfer successful."); |
| | System.out.println("Alice's balance: " + account1.getBalance()); |
| | System.out.println("Bob's balance: " + account2.getBalance()); |
| | } catch (InsufficientBalanceException e) { |
| | System.out.println("Transfer failed: " + e.getMessage()); |
| | } |
| | } |
| | } |
在上面的示例中，我们创建了两个BankAccount对象：account1（属于Alice，余额为1000）和account2（属于Bob，余额为500）。然后，我们尝试从account1向account2转账600元。由于account1的余额足够，转账将成功执行，并打印出转账后的余额。如果我们尝试转账的金额超过账户的余额，transfer方法将抛出InsufficientBalanceException异常，并在catch块中捕获该异常，打印出相应的错误消息