Are you sure you have problem? I have tried to test on my netbean and
I do not see any problem. The button is shown in my computer

On Sep 16, 9:31 am, javaquestion <cplusplusquest...@gmail.com> wrote:
> The "Add" button doesn't show in my computer, however, this code work
> on some other computer.
>
> import java.awt.*;
> import javax.swing.*;
>
> public class AddButton extends JFrame {
>
>   public AddButton() {
>     setSize(300, 150);
>     setDefaultCloseOperation(EXIT_ON_CLOSE);
>
>     JButton b = new JButton("Add");
>
>     Container c = getContentPane();
>     c.setLayout(new FlowLayout());
>     c.add(b);
>     repaint();
>   }
>
>   public static void main(String[] args) {
>     AddButton re = new AddButton();
>     re.setVisible(true);
>   }
>
> }
>
> If I delete  "setSize(300, 150);", add "pack()", it works.  But I need
> to set exactly size for this component.  What's wrong with this?

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