问题
I would like to create a programme based on a robot scenario, that includes abstract classes, interface types and array lists. Can anyone give me some advice on how to create this scenario (via a UML diagram to show how everything links). This scenario needs to include some complex methods, but I am unsure of what to do as a complex method or where to place them in the scenario. Thanks in advance.
回答1:
The world of programming has, for the most part, moved on from complex inheritance hierarchies and instead embraced composition and dependency injection. I suggest you break your monolithic services into small (1-5 method) interfaces. This has the added benefit that unit testing becomes a breeze since you can mock out the dependencies with mockito or similar.
eg:
public interface Walkable {
void walk(Robot robot, int paces);
}
public interface Talkable {
void talk(Robot robot, String phrase);
}
public interface Robot {
void walk(int paces);
void talk(String phrase);
}
public class RobotImpl implements Robot {
private final Walkable walkable;
private final Talkable talkable;
public RobotImpl(Walkable w, Talkable t) {
this.walkable = w;
this.talkable = t;
}
public void walk(int paces) {
walkable.walk(this, paces);
}
public void talk(String phrase) {
talkable.talk(this, phrase);
}
}
来源：https://stackoverflow.com/questions/27961847/robot-scenario-java-inheritance-interface-types-and-abstract-classes