当我的提款输入大于我的现金余额时，如何打印错误信息？

斯科特·巴班

我的 java 银行程序有问题，用户可以从现金余额中提取更大的金额。与我的其他功能相同，即“付款”和“汇款”。我如何拥有像它使用的代码和“else if”语句或？？？我难住了。请帮忙。谢谢。

case "Withdraw": //withdraw money from account
            if(people.get(accIndex).getMoney()<=0) { //if the user does not have enough funds
                JOptionPane.showMessageDialog(null, "You Dont Have Enough Funds In Your Account!", "Javank", JOptionPane.WARNING_MESSAGE);
            }
            else {
            System.out.print("Input amount to withdraw: ");
            double withmoney = in.nextDouble();
            people.get(accIndex).setMoney(people.get(accIndex).getMoney()-withmoney); //gets info from accIndex and withdraws money from account
            JOptionPane.showMessageDialog(null, "Successfully withdrew: "+withmoney,"Javank",JOptionPane.INFORMATION_MESSAGE);
            LocalDateTime myDateObj2 = LocalDateTime.now(); //create local date and time object
            String formattedDate2 = myDateObj2.format(myFormatObj); //store it to a string (formatted)
            checktrans.push("Withdrew "+withmoney+" @ "+formattedDate2); //add to transaction stack
            }
            break;

罗兰·克鲁泽

如果用户一开始就有正余额，我认为这无关紧要。相反，如果请求的金额已被提取，我会检查余额是否会低于零。

就像是

double withmoney = in.nextDouble();
if((people.get(accIndex).getMoney() - withmoney) < 0.0) {
    //the user does not have enough funds
}
else {
    //allow withdrawal
}

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