First Java Swing

package swing;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class SwingExample {

    public static void main(String[] args) {

        JFrame frame = new JFrame("My First GUI");
        frame.setSize(280, 300);

        JLabel label = new JLabel("Hello");
        JTextField textfield = new JTextField("Enter text");

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

        JPanel panel = new JPanel();

        //add components to panel
        panel.add(button1);
        panel.add(button2);
        panel.add(button3);
        panel.add(label);
        panel.add(textfield);

        //then add panel to frame
        frame.add(panel);

        frame.show();
    }
}