test类咋弄pelase，真的是不回了

Question

Answer 1

是实现这个类吗？

public Point2D{
  double x;
  double y;
  Point2D(double x ,double y){
    this.x = x;
    this.y = y;
  }
  public double getX(){return this.x;}
  public double getY{return this.y;}
  public toString(){return "x="+x+",y="+y;}
  public double getdistance(Point2D p){
        double r = Math.sqrt(p.x-x)*(p.x-x)+(p.y-y)*(p.y-y);
        return r;
    }
   public double getdistance(double x,doube y){
        double r = Math.sqrt(this.x-x)*(this.x-x)+(this.y-y)*(this.y-y);
        return r;
    }
}