java编程模拟实现yhk储户存钱取钱,一卡通,xyk取钱,pos机刷卡消费等服务

public double withdrawl(double amt) throws InsufficientFundsException {

if(amt > total) {
throw new InsufficientFundsException();
}
return total - amt;
}
public void process(boolean save, double amt) {
if(save) {
// save money
} else {
try{
double left = withdrawl(amt);

} catch(InsufficientFundsException e) {
// Handle Exception
}
}
}

---