Question

我这里有经过ArrayList<>的这段代码，并检查添加的客户信息是否与该程序的条件匹配。我已完成所有工作，我的问题是如何在代码的末尾打印一条JOptionPane消息，从而在一条消息中显示每个错误，而不是在每次检查后都打印多个JOptionPane消息。如果输入不等于if语句，我希望所有这些单独的消息都放在最后一个大消息中。

for(Customer c : customerCopy){

            //checking is username entered equals a username already in the file
    if(c.getUserName().equals(userTextStr))
        sameUserName = true;
    if(sameUserName)
        JOptionPane.showMessageDialog(null, "User name already taken");
        }

            //checking if both passwords that are entered match each other
    if(!passStr.equals(passStr2))
        JOptionPane.showMessageDialog(null, "Passwords don't match");

            //checking if the password length is within the valid range
    if(passStr.length() < 8 || passStr.length() > 10)
        JOptionPane.showMessageDialog(null, "Password invalid length");

    boolean hasUpperCase = !passStr.equals(passStr.toLowerCase());
    boolean hasLowerCase = !passStr.equals(passStr.toUpperCase());
    boolean hasInteger = false;
        for(int i = 0; i < passStr.length(); i++)
            if(Character.isDigit(passStr.charAt(i)))
                hasInteger = true;

             //checking to see if password contains an uppercase letter   
    if(!hasUpperCase)
        JOptionPane.showMessageDialog(null, "Password must contain an uppercase letter");

            //checking to see if password contains a lowercase letter
    if(!hasLowerCase)
        JOptionPane.showMessageDialog(null, "Password must contain a lowercase letter");

            //checking to see if the password contains a number
    if(!hasInteger)
        JOptionPane.showMessageDialog(null, "Password must contain a number");//PUT ONE LARGE ERROR MESSAGE AT THE END

Answer 1

您可以使用HTML格式化消息：

JOptionPane.showMessageDialog(
    null, 
    "<html><body><p style='width: 200px;'>LARGE ERROR MESSAGE HERE</p></body></html>");

使用JOptionPane在代码末尾添加一条长消息

1 个答案: