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  1. How can we display the line numbers inside a JTextArea in Java?

  2. How to center align the items of a JComboBox in Java?

  3. How can we sort the items of a JComboBox in Java?

  4. What is the importance of a FocusListener interface in Java?

  5. How to set a tooltip text for each item of a JList in Java?

  6. How to display the different font items inside a JComboBox in Java?

  7. How can we show/hide the table header of a JTable in Java?

  8. How can we show/hide the echo character of a JPasswordField in Java?

  9. How can we sort a JTable on a particular column in Java?

  10. How can we implement a rounded JTextField in Java?

  11. How can we prevent the re-ordering columns of a JTable in Java?

  12. How can we highlight the selected tab of a JTabbedPane in Java?

  13. What is the importance of OverlayLayout in Java?

  14. How can we detect the double click events of a JTable row in Java?

  15. How can we implement a long text of the JOptionPane message dialog in Java?

  16. How can we disable cut, copy and paste functionality of a JTextArea in Java?

  17. What is the importance of a Cursor class in Java?

  18. How can we set the foreground and background color to JComboBox items in Java?

  19. How can we add/insert a JRadioButton to a JTable cell in Java?

  20. How can we create a JPopupMenu with a sub menu in Java?
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