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I think you can unselect when a selection has been made. See the caretlistener and use the caret setting methods.

What is the difference between an accidental selection and a desired selection?

Is your problem that you don't want the contents to be selected?
You can probably add a listener and have it turn off the selection.

Not sure what highlighting means. Many components use various visual changes to show change in state. what state does the double click change the textfield to? There might be ways to change the...

I'll see you when you get back.

The code is using an index that is past the end of the array.
Remember that array index values are 0 based and range from 0 to the length-1 of the array.

To keep this from happening, do not use...

Please Edit your post and wrap your code with
<YOUR CODE HERE> to get highlighting

Your end code tag is wrong. Change QUOTE to CODE

You will need to use a number formatting class or method to...

The String passed to valueOf on line 17 was empty.
You need to test if the String passed to the Double class's valueOf() method is empty before calling the method.
If the String is empty the method...

Please post the full text of the error message.

Please Edit your post and wrap your code with
<YOUR CODE HERE> to get highlighting

If you are interested in learning java you would do better to start at the beginning.
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