JFrame problem

[Roldan Baldo]

whats wrong with my code, ive got a problem, it shows a blank frame, but when i resize it, the button and the textfield will appear

    
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import java.awt.*;
//import java.awt.event.*;
import javax.swing.*;

public class Main{
    public static void main(String args[]){
        JFrame frame = new JFrame();
        frame.setVisible(true);
        frame.setSize(300,300);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JPanel panel = new JPanel(new GridBagLayout());
        GridBagConstraints c = new GridBagConstraints();
        JButton button = new JButton("Click");
        c.gridx = 0; c.gridy = 0;
        panel.add(button,c);
        JTextField tx = new JTextField(20);
        c.gridx = 1; c.gridy = 0;
        panel.add(tx,c);
        frame.add(panel);

    }
}
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[Steve Luke]

You are constructing your GUI after the frame is made visible, and never re-validating it (and another nono is you are doing it outside the event dispatch thread but that is minor).

Reorder the code so the JPanel is made and added to the Frame before the frame.setVisible() method is called. You should also set the size of the Frame before making it visible.

[Rob Spoor]

Call frame.pack(). It will set the size automatically to its preferred size. And also move the setVisible(true) call to the end as Steve suggested.

[Campbell Ritchie]

Moving to Swing Forum