Panel_Demo_1.java

package panel_demo;

//PanelDemo.java
//Using a JPanel to help lay out components.

//Java core packages
import java.awt.*;
import java.awt.event.*;

//Java extension packages
import javax.swing.*;

public class Panel_Demo_1 extends JFrame {
private JPanel buttonPanel;
private JButton buttons[];

// set up GUI
public Panel_Demo_1() {
   super("Panel Demo");

   // get content pane
   Container container = getContentPane();

   // create buttons array
   buttons = new JButton[5];

   // set up panel and set its layout
   buttonPanel = new JPanel();
   buttonPanel.setLayout(new GridLayout(1, buttons.length));

   // create and add buttons
   for (int count = 0; count < buttons.length; count++) {
      buttons[count] = new JButton("Button " + (count + 1));
      buttonPanel.add(buttons[count]);
   }

   container.add(buttonPanel, BorderLayout.SOUTH);

   setSize(425, 150);
   setVisible(true);
}

// execute application
public static void main(String args[]) {
   Panel_Demo_1 application = new Panel_Demo_1();

   application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}

}  // end class PanelDemo