Java - 将对象传递给扩展类

Question

假设我有两个公共(public)类(class)，如下所示:

椭圆形类将获取宽度和高度参数。

public class Oval extends Shape{
    OvalClass oval;
    public Oval(int width,int height){
        oval = new OvalClass("first",10);
    }

}

还有一个 Shape 类，它应该具有任何不同的形式(这就是我扩展它的原因)。

public class Shape {

    public void moveLeft(){
      //object?
      object.posX += 1;
  }
}

编辑:

We don't know enough about GOval, the other classes, and the move() method to give a good answer.

将另一个 OvalClass 视为椭圆形类:

public class OvalClass {
    String name;
    int posX;
    public OvalClass(String name, int posx){}
}

问题是，如何获得在 Shape 类的 Oval 中创建的 object 椭圆形 (GOval oval)？有没有更好的方法？

Answer 1

尝试这样的事情:

public class Shape {
  // Now all Shapes can move()
  protected abstract void move(int x, int y);
  public void moveLeft(){
    //object?
    move(-1,0);
  }
}

public class Oval extends Shape {
  private GOval oval;
  public Oval(int width,int height) {
    oval = new GOval(0,0,width,height);
  }
  // Implement move()
  protected void move(int x, int y) {
    oval.move(x, y);// or whatever method on GOval makes it move()
  }
}

HTH