// store this file in a file class2.java. In the same directory
// store the file for class1.java. In the same directory, 
// keep the package Gemetry.
// You compile class2.java and execute it without problem
// Whereas if you make the method Mid_point() in 
// class1.java "non-static", you won't be able to compile
// class2.java. This is because only static methods and attributes
// are accessile to the static main method of class class2.java
// It is idvisable to keep a method static if it is not 
// defined to work on a specific object. So it is a bad programming
// practise if we make the method Mid_point non-static in the file
// class1.java. But if we have to use such a non-static method,
// we shall have to create an object of class class1 and
// then execute the method on the object.
// The moral of the entire discussion is the following
// -----------------------------------------------------------
// 1. when you are designing a method which will be for entire
// class and not for a specific object, you better declare it static.
// Otherwise, you declare it as non-static. 
// 2. A static method is accessed by class_name.method_name. 
// 3. A non-static method is accessed by reference_variable.method_name. 
// 
// These points should hopefully resolve most of your confusion. 
// If you still have any doubts, please ask them in extra class
// to be held on 28September from 10:00 AM to 11:30AM in CS101.
// 
import Geometry.Point;

class class2
{
    public static void main(String args[])
    {
	Point P = new Point(4,4);
	Point Q = new Point(4,0);
	Point R = new Point(0,2);
	Point mid = class1.Mid_point(P,Q);
	double d = R.distance_from_point(mid);
        System.out.println("Distance of R from mid point of P and Q :"+d);
    }
}