import java.awt.*;
import java.awt.event.*;

class StickyPad implements ActionListener, WindowListener
{
   private Frame frm;
   private TextArea noteTA, responseTA;
   private Button leaveBtn, returnBtn, submitBtn;
   private String savedMessages;

   public StickyPad()
   {
      savedMessages = "";
      frm = new Frame("Sticky Pad");
      Panel centerPnl = new Panel();
      centerPnl.setLayout(new FlowLayout());

      noteTA = new TextArea(6,40);
      //set the color of the text area to yellow:
      noteTA.setBackground(Color.yellow);
      //set the font of the text area to a large 20 point font
      noteTA.setFont(new Font("Dialog", Font.PLAIN, 20));
      centerPnl.add(noteTA);

      responseTA = new TextArea(6,40);
      //set the color of the text area to green:
      responseTA.setBackground(Color.green);
      //set the font of the text area to a large 20 point font
      responseTA.setFont(new Font("Dialog", Font.PLAIN, 20));
      centerPnl.add(responseTA);

      Panel southernPnl = new Panel();
      southernPnl.setLayout(new FlowLayout());

      submitBtn = new Button("Submit");
      southernPnl.add(submitBtn);
      submitBtn.addActionListener(this);
      submitBtn.setEnabled(false);

      leaveBtn = new Button("Leave");
      southernPnl.add(leaveBtn);
      leaveBtn.addActionListener(this);

      returnBtn = new Button("Return");
      southernPnl.add(returnBtn);
      returnBtn.addActionListener(this);
      returnBtn.setEnabled(false);

      frm.add(centerPnl, BorderLayout.CENTER);
      frm.add(southernPnl, BorderLayout.SOUTH);
      frm.setSize(500, 420);
      frm.show();
      frm.addWindowListener(this);
  }
  public void windowClosing(WindowEvent e)
  {
      System.exit(0);
  }

  public void windowOpened(WindowEvent e) {}
  public void windowClosed(WindowEvent e) {}
  public void windowIconified(WindowEvent e) {}
  public void windowDeiconified(WindowEvent e) {}
  public void windowActivated(WindowEvent e) {}
  public void windowDeactivated(WindowEvent e) {}

  public void actionPerformed(ActionEvent e)
  {
      if(e.getActionCommand().equals("Leave"))
      {
        //Disable the outgoing text area so it can
        //not be changed and enable the response text
        //area and buttons
        noteTA.setEnabled(false);
        leaveBtn.setEnabled(false);
        returnBtn.setEnabled(true);
        submitBtn.setEnabled(true);
      }
      else if (e.getActionCommand().equals("Submit"))
      {
        //Save the message and clear the response text
        //area for the next visitor
        savedMessages += responseTA.getText() + "\n";
        responseTA.setText("");
      }
      else if (e.getActionCommand().equals("Return"))
      {
        //Disable the response text area and buttons and
        //display the save messages
        responseTA.setText(savedMessages);
        submitBtn.setEnabled(false);
        returnBtn.setEnabled(false);
      }
  }

  public static void main(String args[])
  {
      StickyPad sp = new StickyPad();
  }
}