2java示例
{
main([] args) {
Plane plane Plane();
Observer observer Radar();
plane.addObserver(observer);
plane.setDistance();
}
}
Observable {
name;
Plane( name){
.namename;
}
getName() {
name;
}
setDistance( distance){
(distance){
.setChanged();
.notifyObservers();
}
}
}
Observer {
update(Observable o, arg) {
Plane plane(Plane)o;
System.out.println(plane.getName());
}
}
