这是一个难以描述的问题所以我会尽我所能。
基本上我的程序有两个具体的类:MovablePoint和MovableCircle。两者都实现了Movable接口,它有四种方法:moveUp Down left right。
现在我被困住的地方是,当我构建我的MovableCircle时,我需要使用MovablePoint的实例变量来表示圆的中心。但是我还需要MovableCircle的构造函数来接受5个参数:int x,int y,int xSpeed,int ySpeed,int radius。前4个参数是"中心"这个圈子应该由MovablePoint实例化。
这就是我所拥有的:
public class MovableCircle implements Movable {
private int radius;
private int y;
private int x;
private int xSpeed;
private int ySpeed;
public MovablePoint circleCenter;
public MovableCircle (int x, int y, int xSpeed, int ySpeed, int radius) {
this.radius = radius;
this.x = circleCenter.getX();
this.y = circleCenter.getY();
this.xSpeed = circleCenter.getxSpeed();
this.ySpeed = circleCenter.getySpeed();
}
如果有帮助,这里也是MovablePoint代码:
public class MovablePoint implements Movable{
private int x;
private int y;
private int xSpeed;
private int ySpeed;
public MovablePoint(int x, int y, int xSpeed,
int ySpeed) {
this.x = x;
this.y = y;
this.xSpeed = xSpeed;
this.ySpeed = ySpeed;
}
显然除了我发布的内容之外还有更多的代码,但我相当肯定我已经正确编写了类方法。我相信我的问题在于我需要使用MovablePoint实例化MovableCircle的中心但我不确定如何补救它。感谢您的帮助,如果这个问题很容易解决,我很抱歉,我只是忘记了......
答案 0 :(得分:1)
如下:
public class MovableCircle implements Movable {
private int radius;
private MovablePoint circleCenter;
public MovableCircle (int x, int y, int xSpeed, int ySpeed, int radius) {
this.radius = radius;
this.circleCenter = new MovablePoint(x, y, xSpeed, ySpeed);
}