父類：public class TrainCar extends GCompound{
public TrainCar(double size){
engine = new Engine(size);
add(engine);
}
}子類：public class Engine extends TrainCar {
public Engine (double size){ //繼承父類之后，標(biāo)記這行出錯。如果繼承 GCompound，則無問題。
GPolygon engine = engine(size);
add(engine);
}
}
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