JTextField clears Jframe

Question

I have a JFrame that includes a working button, along with a label. The program works fine, when I click the button I get a popup message that says "starting." But if I try to add a JTextField, when I run the program the frame is blank, for field, button, or label.

The working code without the field is below.

    JFrame frame = new JFrame("Test");
    frame.setSize(750,300);
    frame.setLocationRelativeTo(null);
    frame.setResizable(false);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setVisible(true);



    JPanel panel = new JPanel(false);



    JLabel label = new JLabel("The Game.");



    JButton button = new JButton("Start");
    button.addActionListener(new ActionListener() 
    {
        public void actionPerformed(ActionEvent e)
        {
            //Runs this code when button is pressed
            JOptionPane.showMessageDialog(null, "Starting");
        }
    }
            ); 
    button.setContentAreaFilled(true);
    button.setEnabled(true);
    button.setToolTipText("Starts");
    button.setVisible(true);






    frame.add(panel);
    panel.add(label);
    panel.add(button);

Code with the field that does not work is below.

    JFrame frame = new JFrame("Test");
    frame.setSize(750,300);
    frame.setLocationRelativeTo(null);
    frame.setResizable(false);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setVisible(true);



    JPanel panel = new JPanel(false);



    JLabel label = new JLabel("The Game.");



    JButton button = new JButton("Start");
    button.addActionListener(new ActionListener() 
    {
        public void actionPerformed(ActionEvent e)
        {
            //Runs this code when button is pressed
            JOptionPane.showMessageDialog(null, "Starting");
        }
    }
            ); 
    button.setContentAreaFilled(true);
    button.setEnabled(true);
    button.setToolTipText("Starts");
    button.setVisible(true);







    JTextField field = new JTextField("test", 20);
    field.setEnabled(true);
    field.setVisible(true);







    frame.add(panel);
    panel.add(label);
    panel.add(button);




    panel.add(field);

So somehow those 4 lines of code are clearing the frame.

Neither of them work for me but I think I know what's wrong. — Andy, Jul 19 '13 at 03:32

score 2 · Answer 1 · answered Jul 19 '13 at 03:33

2

Call frame.setVisible(true) in the last line(after all components added). You are calling it before adding the components. to frame

answered Jul 19 '13 at 03:33

Thinesh Ganeshalingam

723
5
15

score 2 · Answer 2 · answered Jul 19 '13 at 03:33

2

if you put

        frame.pack(); or
frame.setVisible(true);

at the bottom of the code it works.

answered Jul 19 '13 at 03:33

Philip Puthenvila

512
1
8
19

score 2 · Answer 3 · answered Jul 19 '13 at 03:33

2

Try yo move your: frame.setVisible(true); as the last statement.

answered Jul 19 '13 at 03:33

user2507946

584
2
9

score 2 · Accepted Answer · edited May 23 '17 at 12:21

2

Move

frame.setVisible(true);

as the last call. To find out more information, please check the link below.

Why shouldn't I call setVisible(true) before adding components?

edited May 23 '17 at 12:21

Community

1
1

answered Jul 19 '13 at 03:34

Andy

5,900
2
20
29

*"Every time you add a Swing component you will always have to call this method"*, no you won't, `revalidate` should be more then fine – MadProgrammer Jul 19 '13 at 03:38
@MadProgrammer That works too. All is explained in the link provided. – Andy Jul 19 '13 at 03:39
@MadProgrammer Would it be better if I remove that statement ? – Andy Jul 19 '13 at 03:41
@MadProgrammer Not a problem. – Andy Jul 19 '13 at 03:43

score 2 · Answer 5 · answered Jul 19 '13 at 03:48

2

There is no need to explicitly set visible property of button to true. Add your panel to the Container of your frame and simple set the visible property of the fame to true at the end.

frame.getContentPane().add(panel);
....
frame.setVisible(true);

answered Jul 19 '13 at 03:48

Aniket Thakur

66,731
38
279
289

score 1 · Answer 6 · answered Jul 19 '13 at 03:35

1

It seems you never made the frame visible at the end. To do this, just put frame.setVisible(true); at the end.

answered Jul 19 '13 at 03:35

Brandon Damante

131
9

JTextField clears Jframe

6 Answers6