Input verifier between textfields and radio buttons

Question 1

From your code i guess public class MyVerifier is an inner class of AddUserDialog2. If so then you should be able to disable JRadioButton inside the boolean verify(JComponent input) function, at the beginning and at the end. This is the easiest solution i can think of:

public boolean verify(JComponent input) {

        maleRb.setEnabled(false);
        femaleRb.setEnabled(false);

        String name = input.getName();
        if (name.equals("fntf")) {
            String text = ((JTextField) input).getText().trim();
            if (text.matches(".*\\d.*")) return false;       // Have Digit
        } else if (name.equals("lntf")) {
            String text = ((JTextField) input).getText();
            if (text.matches(".*\\d.*")) return false;
        }

        maleRb.setEnabled(true);
        femaleRb.setEnabled(true);
        return true;
    }

But doing so, I am afraid you won't intercept the disable effect. In your code:

fNameTf.setName("fntf");
    fNameTf.setInputVerifier(new MyVerifier());
    lNameTf = new JTextField(10);
    lNameTf.setName("lntf");
    lNameTf.setInputVerifier(new MyVerifier());
    maleRb = new JRadioButton("Male");
    maleRb.setInputVerifier(new MyVerifier());
    maleRb.setName("male");
    femaleRb = new JRadioButton("Female");
    femaleRb.setName("Female");
    femaleRb.setInputVerifier(new MyVerifier());

you don't need to create 4 objects for common input verification. Just create one and pass it to these four input object. Again, when you are passing "male" to JRadioButton it is setting it's text feild but not name. so you need to use maleRb.setName("male") and femaleRb.setName("female") and the error will disappear.

Question 2

I Think the better approach is to use data binding. Check JGoodies Binding at http://www.jgoodies.com/freeware/libraries/binding/ but you can try this.

Modify your class MyVerifier adding a constructor that accept and array of JComponent. This components will be enabled if validation is true, disabled otherwise.

public class MyVerifier extends InputVerifier {
    JComponent [] components;

    public MyVerifier(){
    }

    public MyVerifier(JComponent [] components){
        this.components = components;
    }

    private void enableComponents(){
        //enable dependent components
        if (components != null){
            for (JComponent r: components){
                r.setEnabled(true);
            }
        }
    }

    private void disableComponents(){
        //disable dependent components
        if (components != null){
            for (JComponent r: components){
                r.setEnabled(false);
            }
        }
    }

    @Override
    public boolean verify(JComponent input) {
        String name = input.getName();

        if (name == null) {                
            return false;
        }
        else if (name.equals("fntf")) {
            String text = ((JTextField) input).getText().trim();
            if (text.matches(".*\\d.*")){

                //disable dependent components
                disableComponents();

                return false; // Have Digit
            }            
        } else if (name.equals("lntf")) {
            String text = ((JTextField) input).getText();
            if (text.matches(".*\\d.*")){
                //disable dependent components
                disableComponents();

                return false;
            }
        }

        enableComponents();

        return true;
    }
}

Then construct your validator passing the list components you want to enable or disabled depending on the result of the validation.

fNameTf.setInputVerifier(new MyVerifier(new JComponent[]{maleRb, femaleRb}));

This will work not only for JRadioButton but for any JComponent