Java how to display line number on the right side of text components

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I want to display line numbers in a text component. I found this link
<a href="https://tips4java.wordpress.com/2009/05/23/text-component-line-number/" rel="nofollow">https://tips4java.wordpress.com/2009/05/23/text-component-line-number/</a>
And it worked. But I want to display line number on the right side of textarea. How can I do it. Thank!