import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import javax.swing.*;

public class sample01 extends JApplet implements ActionListener {
    int w, h;
    private static final long serialVersionUID = 1L;
    JTextField text_area = new JTextField();
    Canvas cv;
    BufferedImage bi;
    Graphics2D offs;
    public void init() {
        w = getWidth();
        h = getHeight();
        bi = new BufferedImage(w, h - text_area.getHeight(),BufferedImage.TYPE_INT_ARGB);
        offs = (Graphics2D) bi.getGraphics();
        offs.setBackground(Color.YELLOW);
        offs.clearRect(0,0,bi.getWidth(),bi.getHeight());
        cv = new Canvas(){
            private static final long serialVersionUID = 1L;
            public void paint(Graphics g) {
                g.drawImage(bi, 0, 0, null);
            }
        };
        setLayout(new BorderLayout());
        text_area.addActionListener(this);
        add(cv, BorderLayout.CENTER);
        add(text_area, BorderLayout.SOUTH);
    }

    public void start() {
    }

    public void actionPerformed(ActionEvent event) {
        System.out.println("actionPerformed:"+event);
        if (event.getSource() == text_area) {
            String tmp_str = text_area.getText();
            offs.clearRect(0, 0, w, h );
            offs.setColor(Color.RED);
            offs.drawString(tmp_str, 10, ( h / 2) );
            cv.repaint();
        }
    }
}