transparenterne - Objektorienteret programmering i Java

Linietegning
Hvordan får vi information fra lytteren til appletten?
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
public class Linietegning extends Applet
{ public Point trykpunkt;
public Point slippunkt;
public void init()
{ Linielytter lytter = new Linielytter();
// initialiserer lytterens reference til appletten
lytter.appletten = this;
this.addMouseListener(lytter);
}
public void paint(Graphics g)
{ g.drawString("1:"+trykpunkt+" 2:"+slippunkt,10,10);
if (trykpunkt != null && slippunkt != null)
{ g.setColor(Color.blue);
g.drawLine(trykpunkt.x,trykpunkt.y,slippunkt.x, slippunkt.y);
}
}
}
import java.awt.*;
import java.awt.event.*;
import java.applet.Applet;
public class Linielytter implements MouseListener
{ public Linietegning appletten;
}
public void mousePressed(MouseEvent hændelse)
{ appletten.punkt1 = hændelse.getPoint();
}
public void mouseReleased(MouseEvent hændelse)
{ appletten.punkt2 = hændelse.getPoint();
appletten.repaint();
}
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// Ubrugte hændelser (skal defineres for at implementere interfacet)
//−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−
public void mouseClicked(MouseEvent event) {} // kræves af MouseListener
public void mouseEntered(MouseEvent event) {} // kræves af MouseListener
public void mouseExited (MouseEvent event) {} // kræves af MouseListener