我有一个如下界面：
package example;
import java.awt.Point;
public interface Thing {
public enum MovingState {
MOVING_LEFT,
MOVING_UP,
MOVING_RIGHT,
MOVING_DOWN
}
public void setNewPosition(MovingState state);
public Point getPosition();
}
和一个实现类：
package example;
import java.awt.Point;
public class ThingImpl implements Thing {
public enum MovingState {
MOVING_LEFT (-1, 0),
MOVING_UP (0, -1),
MOVING_RIGHT (1, 0),
MOVING_DOWN (0, 1);
private int x_move;
private int y_move;
MovingState(int x, int y) {
x_move = x;
y_move = y;
}
public int xMove() {
return x_move;
}
public int yMove() {
return y_move;
}
}
private Point position;
public void setNewPosition(MovingState state) {
position.translate(state.xMove(), state.yMove());
}
public Point getPosition() {
return position;
}
}
这个想法是让ThingImpl中的MovingState从Thing界面扩展MovingState(从而将MoveState的实际实现与界面分开).
这不起作用 – ThingImpl中的MovingState枚举会影响接口中的定义,而不是扩展它,然后编译器抱怨ThingImpl不是抽象的,并且不会覆盖Thing中的抽象方法setNewPosition(Thing.MovingState).
有没有实际的方法来做我想要实现的？还是Java根本没有这种能力？