Question

I’m currently working with getting a phone number from a JtextField, the problem i’m having is that after three digits are entered I want to add a “-” after the third integer is added then another “-” after the sixth integer is added. I’m not exactly sure how to do this. So far I am only checking the digits and making sure they are numbers. I’m pretty sure i should add something here,

homeNum.addKeyListener(new KeyAdapter() {
        @Override
        public void keyTyped(KeyEvent e) {
            String homeValue = homeNum.getText();
            if (e.getKeyChar() >= '0' && e.getKeyChar() <= '9' || e.getKeyChar() == '-' || e.getKeyChar() == '\b') {


                      homeNum.setEditable(true);
                        message.setText("");

        } 
            else {
                homeNum.setEditable(false);
                message.setText("* Enter only numeric digits(0-9)");

                 }

        }

I was thinking about adding something like this in but the problem is that I can’t delete it if I wanted too.

 if(homeValue.length()==3)
    {
       homeNum.setText(homeValue+"-");
    }

Anything help/pointers would be greatly appreciated, Thanks.

Answer 1

One way you can do it is this.. You monitor the number of times a key has been pressed. When it gets to 3, you setText to whatever you have there plus a - Now there are other things to consider like when the backspace has been pressed, you need to subtract one from your counter rather than adding.

Do the same for about 3-4 special keys(like not adding anything when enter is pressed).

You can do these in the background if you have a look at the SwingWorker..

Good luck