Straight and Distance between two points in java

The purpose of this article is to learn how to create a point with the coordinates x and y in a two-dimensional plane, then create a second point and calculate the distance between the two.

1) Create the class Point

To structure our program well, We must avoid the creation of multiple instances of x and y (x1,x2,.. xn-y1,y2,.. yn). Java is an object-oriented language that has a high capacity for abstraction.

public class Point {

 int x,y; 

 public Point(int x, int y){
 this.x=x;
 this.y=y; 
 }
 
 public int getX() {
 return x;
 }

 public void setX(int x) {
 this.x = x;
 }

 public int getY() {
 return y; 
 }

 public void setY(int y) {
 this.y = y; 
 }
}

2) Create the class Line

A line is formed with at least two points P1 and P2, the distance is calculated by the Pythagorean theorem:

The Pythagorean theorem is applied when the triangle is rectangular, the formula is written: c² = a² + b². The length is then the root of c² and calculated using the method Math.sqrt().

public class Right {
 
 dot p1, p2; 
 
 public Right (dot p1, dot p2){
 this.p1=p1; 
 this.p2=p2; 
 }
 
 double length(){
 return p1.distance(p2); 
 }
}

Now we're going to declare the distance() method in the Point class that allows you to return the distance between the current point and the past point as a parameter:

double distance(Point p){
 return Math.sqrt(((p.getX()-this.getX()) + (p.getY()-this.getY())); 
}

Example

public class Main {
 
 public static void main(String[] args) {
 
 Point p1 = new Point(2,  3); 
 Point p2 = new Point(5, 8); 
 line Straight = new Straight (p1, p2); 
 System.out.println(Right.length()); 
 
 Point p3 = new Point(7, 3); 
 System.out.println("distance between the point("+p1.getX()+", "+p1.getY()+
 ") and the point("+p2.getX()+", "+p2.getY()+": "+p1.distance(p3)); 
 }
}

Output:

2.8284271247461903
Distance between point(2, 3) and point(5, 8): 2.23606797749979

References:
Wikipedia: Right(mathematics)
Wikipedia: Pythagorean theorem
Oracle Documentation: Math.sqrt