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

public class tablet_events3 extends Applet implements ActionListener, KeyListener, TextListener {

TextField textField;

public void init() 
{
	setBackground(new Color(225,225, 255));
	textField = new TextField(20);
	textField.addActionListener(this);
	textField.addKeyListener(this);
	textField.addTextListener(this);
	add(textField);
	textField.requestFocus();
}

void fixText()
{
	if (getDoubleFromString(textField.getText()) < -0.01) textField.setText("Error");
}

public void actionPerformed(ActionEvent ae)
{
	System.out.println("actionPerformed: " + textField.getText());
}

public void keyPressed(KeyEvent ke)
{
	System.out.println("keyPressed: " + textField.getText());
}

public void keyReleased(KeyEvent ke)
{
	System.out.println("keyReleased: " + textField.getText());
}

public void keyTyped(KeyEvent ke)
{
	System.out.println("keyTyped: " + textField.getText());
	fixText();
}

public void textValueChanged(TextEvent te)
{
	System.out.println("textValueChanged: " + textField.getText());
}

double getDoubleFromString(String s)
{
	s = s.trim();
	if (s.equals("") || s == null) return (-1.0);
	try
	{
		return (Double.valueOf(s).doubleValue());
	}
	catch (Exception e)
	{
		return(-1.0);
	}
}
}  // END OF Class tablet_events3