Java class program

Question

getting 0.0 as output which is wrong

import java.util.*;
class Point
{
int x, y;
Point()
{
x=0;
y=0;
}

void getdata(int a, int b)
{
x=a;
y=b;
}
}

class Line
{
Point p1 = new Point();
Point p2 = new Point();

Line()
{
p1.x=0; p1.y=0; p2.x=0; p2.y=0;
}

Line(int a, int b ,int c, int d)
{
p1.x=a; p1.y=b; p2.x=c; p2.y=d;
}

double length()
{
double ans;
ans=Math.sqrt((p2.x-p1.x)*(p2.x-p1.x)-(p2.y-p1.y)*(p2.y-p1.y));
return ans;
}

}

class Triangle
{
Line l1 = new Line();
Line l2 = new Line();
Line l3 = new Line();

void perimeter()
{
System.out.print (l1.length()+l2.length()+l3.length());
}
}

class Program
{
public static void main(String [] args)
{
Scanner sc = new Scanner(System.in);
Point p = new Point();
System.out.print("Enter two points\n");
int a = sc.nextInt();
int b = sc.nextInt();

p.getdata(a,b);

Line l = new Line();
l.length();

Triangle t = new Triangle();
t.perimeter();
}
}

https://www.sololearn.com/compiler-playground/cnXOSNypDPUw

Answer 1

There are some mistakes

Inside class Point
change method name
instead of this getdata use this: setPoint

with this code it deals with objects :

Line(Point pt1 , Point pt2)
{
p1 = pt1;
p2 = pt2;
}

to present the result use this:

System.out.println (l.length());