Question

I’m using the interface Place:

public interface Place
{
    int distance(Place other);
}

But when I try to implement the interface and compile the following code, a “cannot find symbol – variable xcor” error returns.

public class Point implements Place
{
    private double xcor, ycor;

    public Point (double myX, double myY)
    {
        xcor = myX;
        ycor = myY;
    }

    public int distance(Place other)
    {
        double a = Math.sqrt( (other.xcor - xcor) * (other.xcor - xcor) + (other.ycor - ycor) * (other.ycor -ycor) ) + 0.5;
        return (int)a;
    }

}

Any ideas for what I might be doing wrong? Does it have something to do with the scope of the fields?

Answer 1

The interface Place has no member xcor. Add a method double getXcor() to your interface and implement it in your class. The same applies to ycor. Then you can use these getters in your implementation of the distance method.

public interface Place
{
    int distance(Place other);
    double getXcor();
    double getYcor();
}