public class Planet3 {
    public double radie;
    public double x;
    public double y;
    public double z;

    public double computeVolume() {
        return 4* Math.PI*Math.pow(radie, 3) / 3;
    }//computeVolume

    public double computeDistance(Planet3 other) {
        return Math.sqrt(Math.pow(this.x - other.x, 2) 
                    + Math.pow(this.y - other.y, 2) 
                    + Math.pow(this.z - other.z, 2));
    }//computeDistance

} //Planet