title: Removing lines around button after it's clicked in Swing
body: <p>I have a JButton in Java(Swing):</p>
  <p><img src="https://i.stack.imgur.com/qvvhF.png" alt="Button" /></p>
  <p>After the click I get this line around the button:</p>
  <p><img src="https://i.stack.imgur.com/kzmnt.png" alt="enter image description here" /></p>
  <p>How do I remove these lines?</p>