public abstract class TrainUpgrade extends java.lang.Object
Train
train
TrainUpgrade(Train train, int price)
void
addUpgrade()
int
getCost()
undoUpgrade()
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
public Train train
public TrainUpgrade(Train train, int price)
public int getCost()
public void addUpgrade()
public void undoUpgrade()