从另一个类访问私有的最终静态双精度

Question

I am trying to access a private final static double from another class.

Here is the class:

public class coolMath{

private final static double alpha = 5.87;

public coolMath(){

}

public static double calDistance(double x1, double y1, double x2, double y2){
        double dist = Math.sqrt(Math.pow((x2-x1), 2) + Math.pow((y2-y1),2));     
        return dist;
    }

}

I need to access the variable alpha in another class. Is this possible? Does something need to happen in the constructor to make it available? Any ideas?

Answer 1

Either make alpha a public field or provide a public static double getAlpha() that returns it.

If you make the field public, you access it like so double a = coolMath.alpha .

Otherwise, double a = coolMath.getAlpha();

I strongly suggest you go through java modifiers again.

Answer 2

This could technically be possible through some esoteric reflection methods, but I highly discourage it. It's better to change the visibility of your alpha variable or write some method that returns it (or perhaps sets it, if you need that also (but not if your var is final )).