source file name:  ActionPoint.java

import java.io.*;

class Point

{

int x,y;

public Point(int p,int q)

{

x=p;y=q;

}

public Point()

{

x=0;y=0;

}

public void disppoint()

{

System.out.println("x: "+x+" y= "+y);

}

public void length(Point O,Point P)

{

double len;

len=Math.sqrt((P.x-O.x)*(P.x-O.x)+(P.y-O.y)*(P.y-O.y));

System.out.println("length of segment QP is = "+len);

}

public void slope(Point O,Point P)

{

double len;

len=(P.y-O.y)/(P.x-O.x);

System.out.println("slope of segment QP is ="+len);

}

}


class ActionPoint

{

public static void main(String as[])

{ 

Point p1=new Point();

p1.disppoint();

Point p2=new Point(10,10);

p2.disppoint();

Point p3=new Point(5,7);

p3.disppoint();

p1.slope(p1,p2);

p1.length(p1,p2);

p1.slope(p1,p3);

p1.length(p1,p3);

}

}

output:

D:\JavaPrograms\Constructors>javac ActionPoint.java

D:\JavaPrograms\Constructors>java ActionPoint
x: 0 y= 0
x: 10 y= 10
x: 5 y= 7
slope of segment QP is =1.0
length of segment QP is = 14.142135623730951
slope of segment QP is =1.0
length of segment QP is = 8.602325267042627