Build UI method for the Twenty Questions game on SSaurel's Channel

BuildUI.java

private void buildUI() {
  // we build the UI
  JFrame frame = new JFrame("Twenty Questions on SSaurel");
  frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  Container contentPane = frame.getContentPane();

  // add buttons
  JPanel buttonsPanel = new JPanel();

  yesButton = new JButton("Yes");
  yesButton.addActionListener(btnsListener);
  buttonsPanel.add(yesButton, BorderLayout.LINE_START);

  restartButton = new JButton("Start");
  restartButton.addActionListener(btnsListener);
  buttonsPanel.add(restartButton, BorderLayout.LINE_START);

  noButton = new JButton("No");
  noButton.addActionListener(btnsListener);
  buttonsPanel.add(noButton, BorderLayout.LINE_END);

  contentPane.add(buttonsPanel, BorderLayout.PAGE_END);

  // add text area
  textPane = new JTextPane();
  textPane.setEditable(false);
  updateText("Think to an animal, then click on Start");

  // we define some style for the text pane
  SimpleAttributeSet bSet = new SimpleAttributeSet();
  StyleConstants.setAlignment(bSet, StyleConstants.ALIGN_CENTER);
  StyleConstants.setFontSize(bSet, 22);
  StyledDocument doc = textPane.getStyledDocument();
  doc.setParagraphAttributes(0,  doc.getLength(), bSet, false);

  contentPane.add(textPane, BorderLayout.CENTER);

  frame.setMinimumSize(new Dimension(500, 250));

  // we center the JFrame
  Dimension objDimension = Toolkit.getDefaultToolkit().getScreenSize();
  int coordX = (objDimension.width - frame.getWidth()) / 2;
  int coordY = (objDimension.height - frame.getHeight()) / 2;
  frame.setLocation(coordX, coordY);

  // we display the window
  frame.pack();
  frame.setVisible(true);
}