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功能：
实现一个银行账户类 BankAccount，
支持账户创建、户主姓名设置、存款、取款和余额查询，并对非法金额、余额不足等情况做异常判断。
编译命令：
javac BankAccount.java TestBankAccount.java
运行命令：
java TestBankAccount
