In this tutorial how to create a Frame with JPanel Class and Handle an Event using ActionListener Interface in Core Java is shown.
[themify_quote]Code:
ButtonSettingBackground.java
import java.awt.Color;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class ButtonSettingBackground extends JPanel implements ActionListener
{
private JButton greenButton = new JButton(“Green”);
private JButton blueButton = new JButton(“Blue”);
private JButton redButton = new JButton(“Red”);
public ButtonSettingBackground()
{
add(greenButton);
add(blueButton);
add(redButton);
greenButton.addActionListener(this);
blueButton.addActionListener(this);
redButton.addActionListener(this);
}
public void actionPerformed(ActionEvent e)
{
Object source = e.getSource();
Color color = getBackground();
if(source == greenButton)
color = Color.green;
else if(source == blueButton)
color = Color.blue;
else if(source == redButton)
color = Color.red;
setBackground(color);
repaint();
}
public static void main(String args[])
{
JFrame frame = new JFrame(“ButtonTest”);
frame.setSize(300,200);
frame.addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
});
Container contentPane = frame.getContentPane();
contentPane.add(new ButtonSettingBackground());
frame.show();
}
}
