In the previous article, we have seen Java Program to Check if Three Points are Collinear

In this article we will discuss about how to find line passing through 2 pointsÂ using Java programming language.

## Java Program to Find Line Passing Through 2 Points

Before jumping into the program directly, let’s first know how we can find line passing through 2 points.

**Explanation****:**

Lets assume we have two point (x1,y1) and (x2,y2) .now we can find equation of the line by x1x + y1y = c1 x2x + y2y = c2

Let’s see different ways to find line passing through 2 points.

### Method-1: Java Program to Find Line Passing Through 2 Points By Using Static Value

**Approach :**

- Initialize and declare the point x1,x2.
- Find out the equation of the line
- Print it .

**Program :**

class Main { // Driver method public static void main(String args[]) { IntsPoint x1 = new IntsPoint(3, 2); IntsPoint x2 = new IntsPoint(2, 6); lines_pts(x1,x2); } static class IntsPoint { int a,b; public IntsPoint(int a, int b) { this.a = a; this.b = b; } } //find the line passing through 2 points by using equation static void lines_pts(IntsPoint x1, IntsPoint x2) { int x = x2.b - x1.b; int y = x1.a - x2.a; int z = x * (x1.a) + y * (x1.b); if (y < 0) System.out.println("The line passing through points x1 and x2 is: " + x + "x - " + y + "y = " + z); else System.out.println("The line passing through points x1 and x2 is: " + x + "x + " + y + "y = " + z); } }

Output: The line passing through points x1 and x2 is: 4x + 1y = 14

### Method-2: Java Program to Find Line Passing Through 2 Points By Using Dynamic Value

**Approach :**

- Take input of point x1,x2.
- Find out the equation of the line
- Print it .

**Program :**

import java.util.*; class Main { // Driver method public static void main(String args[]) { Scanner s = new Scanner(System.in); int l ,m ; //taking input of point values System.out.println("Enter values of point 1: "); l=s.nextInt(); m=s.nextInt(); IntsPoint x1 = new IntsPoint(l, m); System.out.println("Enter values of point 2: "); l=s.nextInt(); m=s.nextInt(); IntsPoint x2 = new IntsPoint(l, m); lines_pts(x1,x2); } static class IntsPoint { int a,b; public IntsPoint(int a, int b) { this.a = a; this.b = b; } } //find the line passing through 2 points by using equation static void lines_pts(IntsPoint x1, IntsPoint x2) { int x = x2.b - x1.b; int y = x1.a - x2.a; int z = x * (x1.a) + y * (x1.b); if (y < 0) System.out.println("The line passing through points x1 and x2 is: " + x + "x - " + y + "y = " + z); else System.out.println("The line passing through points x1 and x2 is: " + x + "x + " + y + "y = " + z); } }

Output: Enter values of point 1: 3 2 Enter values of point 2: 2 4 The line passing through points x1 and x2 is: 2x + 1y = 8

Guys who are serious about learning the concepts of the java programming language should practice this list of programs in java and get a good grip on it for better results in exams or interviews.

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