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
