How to select one line in TextArea?

does anybody know how to click one line in TextArea and get the contents of the line(string)? How can I implement the action?
any hints would be appreciated.
thanks in advance.

The term 'line' might mean a displayed line of text or it might mean text delimited by a newline character.
If you mean text delimited by a newline character, then sylvain.barbot has an approach that may work. A MouseListener would know when a click occurs and could determine the 'line' of text between \n's from the current Caret position.
If you mean a displayed line of text, that will be difficult unless you put restrictions on the TextArea. If you allow the TextArea to be resized or use a variable-width font, then I can't think of a way to do what you want. The number of characters per line changes depending on the current size and the character content of the TextArea. You might as well write your own TextArea.
If you use a fixed-width font, then you should be able to calculate the number of characters per line. With a ComponentListener, you should be able to re-calculate the number of characters per line when the TextArea is resized. It would be easiest if you did not allow resizing of the TextArea and used a fixed-width font. Then getCaretPosition() would give you the position in the whole TextArea and you could calculate the line start and end.

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