problema con applet de juego piedra-papel-tijera

[emucho]

El problema esta en el metodo: public void actionPerformed(ActionEvent event)

Reemplazalo por:

public void actionPerformed(ActionEvent event) {
if (event.getSource() == tijera){
scissor = true;
paper = false;
rock = false;
}else if(event.getSource() == papel){
paper = true;
scissor = false;
rock = false;
}else{
rock = true;
paper = false;
scissor = false;
}
repaint();
}

Saludos.-