Java抽象类常量
我有以下抽象类:Java抽象类常量,java,Java,我有以下抽象类: public abstract class GameObject { protected final GameSession session; protected final int id; protected Point position; public GameObject(GameSession session, Point position) { this.position = position; this.id = session.getNewId(
public abstract class GameObject {
protected final GameSession session;
protected final int id;
protected Point position;
public GameObject(GameSession session, Point position) {
this.position = position;
this.id = session.getNewId();
this.session = session;
}
public void setPosition(Point position) {
this.position = position;
}
public int getId() {
return id;
}
public Point getPosition() {
return position;
}
每个gameObject
还包含常量WIDTH
和HEIGHT
。我想为所有应该使用这些常量的游戏对象添加方法getBar()
。下面是一个游戏对象的示例:
public class Wall extends GameObject {
private static final Logger logger = LogManager.getLogger(Wall.class);
private static final int WIDTH = 32;
private static final int HEIGHT = 32;
public Wall(GameSession session, Point position) {
super(session, position);
logger.info("New Wall id={}, position={}", id, position);
}
和getbar()
如果它在Wall
类中:
public Bar getBar() {
return new Bar(position, position.getX() + WIDTH, position.getY() + HEIGHT);
}
如何正确实现
GameObject
?问题是我不能只在内部初始化WIDTH
和HEIGHT
,因为它们在子类中不同。在抽象类游戏对象中定义抽象方法getBar()
public abstract Bar getBar()
然后所有扩展了GameObject
的类都必须实现它们。
例如,Wall
类将有一个方法
@Override
public Bar getBar() {
return new Bar(position, position.getX() + WIDTH, position.getY() + HEIGHT);
}
或者,您可以在GameObject
中创建构造函数,该构造函数也将接受这些常量,然后您可以进行单个方法调用(无需重写):
然后在你的Wall
课上
public Wall(GameSession session, Point position) {
super(session, position, 32, 32); //Added WIDTH and HEIGHT
logger.info("New Wall id={}, position={}", id, position);
}
谢谢你的全面回答。
public Wall(GameSession session, Point position) {
super(session, position, 32, 32); //Added WIDTH and HEIGHT
logger.info("New Wall id={}, position={}", id, position);
}