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

public class Diamond extends java.applet.Applet implements ActionListener
{
    TextField tf;
    TextArea ta;
    Button bDraw;
    String stars = "*******************";
    String spaces = "          ";
    int k;
    
    public void init()
    {   
        tf = new TextField("Hello    ");
        ta = new TextArea(22, 20);
        ta.setFont(new Font("Monospaced", Font.BOLD, 12));
        bDraw = new Button("Draw");
	bDraw.addActionListener(this);
        add(tf);
        add(bDraw);
        add(ta);
    }
    
    public void actionPerformed(ActionEvent event)
    {
        Object cause = event.getSource();

        if (cause == bDraw)
        {
            tf.setText("Goodbye");
            k = 0;
            while (k < 10)                            
            {  
                ta.append(spaces.substring(0,10-k) + 
                          stars.substring(0,2*k+1)+"\n");
                k = k + 1;
            }
            k = 1;
            while (k < 10)
            {
                ta.append(spaces.substring(0,1+k) + 
                          stars.substring(0,19-2*k)+"\n");
                k = k + 1;
            }
        }
    }
}