How to check which JTextFields are empty and inform the user about them?

Question

I have a code sample with JTextFields. When a user does not enter the details in some JTextField, and then clicks the \"Register\" button, I want the u

Answer 1

Create an Array of error messages:

String[] errors = 
{
    "First Name is missing",
    "Middle Name is missing",
    ...
};

Then in your looping code you can just reference the Array for the appropriate message. You might want to use a JTextArea since you could have multiple message:

if (check[i] == 0) 
{
    textArea.append( errors[i] );
}

You could even simplify your code by create an Array of text fields then your looping code would be something like:

for (int i = 0; i < textFields.length; i++) 
{
    JTextField textField = textFields[i];
    String text = textField.getText();
    int length = text.length();

    if (length == 0) 
    {
        textArea.append( ... );
    }
}

Look to create loops/reusable code. It makes maintenance easier if you ever need to add another text field to test.