how to center this button 1

[Roldan Baldo]

how to center button 1 please? what code will i add.

  

import java.awt.*;
import javax.swing.*;
class Test{
    public static void main(String args[]){
        new width();
    }
    static class width extends JFrame{
        width(){
            super("Frame");

            JPanel panel = new JPanel(new GridBagLayout());
            GridBagConstraints c = new GridBagConstraints();
           

            JButton button1 = new JButton("button 1");
            JButton button2 = new JButton("button 2");
            JButton button3 = new JButton("button 3");
           

            c.gridwidth = 3;
            c.gridx = 0; c.gridy = 0;
            panel.add(button1,c);

            c.gridwidth = 1;
            c.gridx = 0; c.gridy = 1;
            panel.add(button2,c);

            c.gridx = 1; c.gridy = 1;
            panel.add(button3,c);

            this.add(panel);
            this.setSize(300,300);
            this.setVisible(true);
            this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        }

    }
}

[Rob Spoor]

Button 1 already is centered when I test your code. And it should - the anchor property of GridBagContraints defaults to centered.