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

public class DiaFuncts extends java.applet.Applet implements ActionListener
{
    TextField tf;
    TextArea ta;
    Button bDraw;
    String stars = "*******************";
    String spaces = "          ";
    
    public void init()
    {   
        tf = new TextField("Hello    ");
        ta = new TextArea(20, 20);
        ta.setFont(new Font("Monospaced", Font.BOLD, 12));
        bDraw = new Button("Draw");
	bDraw.addActionListener(this);
        add(tf);
	add(bDraw);
        add(ta);
    }
    
    void Dia()
    {
    
        int k = 0;
        while (k < 10)
        {
               
            ta.append(spaces.substring(0,10-k) + 
                      stars.substring(0,2*k+1)+"\n");
            k = k + 1;
        }
    }
    
    void Mond()
    {
        int k = 1;
        while (k < 10)
        {             
            ta.append(spaces.substring(0,1+k) + 
                      stars.substring(0,19-2*k)+"\n");
            k = k + 1;
        }
    }

    public void actionPerformed(ActionEvent event)
    {
        Object cause = event.getSource();

        if (cause == bDraw)
        {
            tf.setText("Goodbye");
            Dia();    
            Mond();
        }
    }
}