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Is there a listener for inserting a cursor into the JTextField?

Here is my application. It is a wallet for upgrading my money when I spend or make a profit. Have a look at image hosting here http://tinypic.com/r/687bdk/8

At this point, I need to learn something from you. Is there a way to detect that the cursor has been positioned in one of the JText fields? If there is, then I could post a method that will remove everything in the other JTextField. As there should only be one JTextField with input. And it is unacceptable to have inputs in both text boxes.

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Is there a way to detect that the cursor has been positioned in one of the JText fields? If there is, then I could post a method that will remove everything in the other JTextField.

As a user, I'm not too crazy about this design. I used accounting type apps before you have two columns (debit / credit) and the number can only be entered in one.

In these applications, the number is not removed by focus, it is removed if a value is entered in another field. This allows you to navigate between fields on the forum without disappearing data just due to a focus change.



To implement this type of functionality, you must add DocumentListener

a Document

text box. Then, when text is entered into the Document, a listener is called and you can clear the text from another text box.

Check out the section from the Swing tutorial on How to Write a DocumentListener for more information and examples.

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You can add FocusListener

to each textbox ie



        JTextField myTextField = new JTextField();
        myTextField.addFocusListener(new FocusListener() {

            @Override
            public void focusGained(FocusEvent e) {
                //when selected...
            }

            @Override
            public void focusLost(FocusEvent e) {
                //when not selected..
            }
        });
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He called: CaretListener 

jTextArea=new JTextArea();
jTextArea.addCaretListener(new CaretListener(){
    public void caretUpdate(CaretEvent e){
      //your code
    }
  }
);

Mostly used when you need to know that your carriage position has changed.

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