import java.awt.*;
interface rect {
    double area();
    double getWidth();
    double getHeight();
    double getLocation();
}
import java.awt.*;
 class Rectangle1 implements rect {
    Point p = new Point();
    double width,height;
    int x,y;
    
    public Rectangle1 (double w,double h,int i1,int i2)    {
        width = w;
        height = h;
        x = i1;
        y = i2;
        }
        
    public double area() {
        return width * height;
        }
        
    public  double getWidth() {
        return width;
        }
        
    public double getHeight() {
        return height;
        }
    public Point getLocation() {
        p.x = x;
        p.y = y;
        return p;
        }    
}    

public class Rect {
    public static void main (String [] args)    {
        Rectangle1 rc = new Rectangle1(2.3,8.0,1,2);
        System.out.println(rc.area());
        System.out.println(rc.getWidth());
        System.out.println(rc.getHeight());
        System.out.println((rc.getLocation()).x + (rc.getLocation()).y);
        }
    }

我试着改返回值类型了，但还是跑不起来，请哪问高手帮忙改一下，我这位新手不胜感激

谢谢各位大侠的提点，我试过了，但还是编译不通过，不过我一定不会放弃的。

调试了很久，终于可以编译了，真的很感谢你们！