public static void main(String[] args) {
Point3D p1 = new Point3D(1, 2, 3);
Point3D p2 = new Point3D(1, 2, 3);
System.out.println(p1);
System.out.println(p2);
System.out.println("p1==p2?" + (p1 == p2));
System.out.println("p1.equals(p2)?" + (p1.equals(p2)));
}
public Line3D(Point3D start, Point3D end) {
if (start.equals(end))
throw new IllegalArgumentException("Given arguments are a Point not a line!");
// finding gradeY and gradeZ.
if (start.x < end.x) {
this.start = start;
this.end = end;
} else {
this.end = start;
this.start = end;
}
this.gradeY = (this.end.y - this.start.y) / (this.end.x - this.start.x);
this.gradeZ = (this.end.z - this.start.z) / (this.end.x - this.start.x);
this.offsetY = this.start.y - this.gradeY * this.start.x;
this.offsetZ = this.start.z - this.gradeZ * this.start.x;
}