package jlookuptabledemo;import java.awt.*;import java.awt.event.*;import javax.swing.*;public class MainFrame extends JFrame {  private JPanel contentPane;  private BorderLayout borderLayout1 = new BorderLayout();  private JPanel jPanel1 = new JPanel();  private JButton jButton1 = new JButton();  private JButton jButton2 = new JButton();  private GridLayout gridLayout1 = new GridLayout();  private JButton jButton3 = new JButton();  DrawPane drawPane = new DrawPane();  //Construct the frame  public MainFrame() {    enableEvents(AWTEvent.WINDOW_EVENT_MASK);    try {      jbInit();    }    catch(Exception e) {      e.printStackTrace();    }  }  //Component initialization  private void jbInit() throws Exception  {    //setIconImage(Toolkit.getDefaultToolkit().createImage(MainFrame.class.getResource("[Your Icon]")));    contentPane = (JPanel) this.getContentPane();    contentPane.setLayout(borderLayout1);    this.setSize(new Dimension(355, 251));    this.setTitle("JLookupTableDemo");    jButton1.setFont(new java.awt.Font("Dialog", 0, 14));    jButton1.setText("Brighten");    jButton1.addActionListener(new java.awt.event.ActionListener() {      public void actionPerformed(ActionEvent e) {        jButton1_actionPerformed(e);      }    });    jButton2.setFont(new java.awt.Font("Dialog", 0, 14));    jButton2.setToolTipText("");    jButton2.setText("Darken");    jButton2.addActionListener(new java.awt.event.ActionListener() {      public void actionPerformed(ActionEvent e) {        jButton2_actionPerformed(e);      }    });    jPanel1.setLayout(gridLayout1);    jButton3.setFont(new java.awt.Font("Dialog", 0, 14));    jButton3.setText("Reset");    jButton3.addActionListener(new java.awt.event.ActionListener() {      public void actionPerformed(ActionEvent e) {        jButton3_actionPerformed(e);      }    });    contentPane.add(jPanel1, BorderLayout.SOUTH);    jPanel1.add(jButton1, null);    jPanel1.add(jButton2, null);    jPanel1.add(jButton3, null);  }  //Overridden so we can exit when window is closed  protected void processWindowEvent(WindowEvent e) {    super.processWindowEvent(e);    if (e.getID() == WindowEvent.WINDOW_CLOSING) {      System.exit(0);    }  }  void jButton1_actionPerformed(ActionEvent e) {    drawPane.brightenLUT();    drawPane.applyFilter();    drawPane.repaint();  }  void jButton2_actionPerformed(ActionEvent e) {    drawPane.darkenLUT();    drawPane.applyFilter();    drawPane.repaint();  }  void jButton3_actionPerformed(ActionEvent e) {    drawPane.reset();    drawPane.repaint();  }}