# Distance between two points in java

(Last Updated On: July 14, 2021)

2 methods to calculate distance between two points in java with code example. 1- Using formula. 2- Using a Point class objects.

## Distance between two points using formula

We know that the distance between two points (x1,y1) and (x2,y2) on a flat surface is as below. That we’ll use in the java program to find distance.

``````    ____________________
/       2          2
\/ (y2-y1)  + (x2-x1)``````

Code Example:

This is very simple java program to demonstrate how we can calculate the distance between two co-ordinates / points using formula.

``````/*--------------------------------------------------------
* Simple example to get distance between two points
* (x1,y1) and (x2,y2)
*/

public class Sample {

public static void main(String[] args) {

// point 1
double x1 = 1;
double y1 = 1;

// point 2
double x2 = 5;
double y2 = 5;

// Calculate distance between two points
double distance = Math.sqrt((x2 - x1) * (x2 - x1) + (y2 - y1)
* (y2 - y1));

System.out.println("Distance between two points :" + distance);
}

}``````

## Distance between two points using Point Class

This program has a class Point with fields X and Y. We will create two objects of it representing two points.

It contains a method “double getDistance(Point p)” that returns distance between two points.

Code Example:

``````/*---------------------------------------------------------
* Example to calculate distance between two points objects.
*/
class Point {

private double x;
private double y;

Point(double x, double y) {
this.x = x;
this.y = y;
}

public double getX() {
return x;
}

public double getY() {
return y;
}

// This method accept a point object
// and calculate distance with current object.

// "this" keyword refer current object.
public double getDistance(Point p) {

return Math.sqrt((this.getX() - p.getX()) * (this.getX() - p.getX())
+ (this.getY() - p.getY()) * (this.getY() - p.getY()));
}

}

public class Sample {

public static void main(String[] args) {

Point px = new Point(1, 1);

Point py = new Point(5, 5);

double distance = px.getDistance(py);

System.out.println(distance);
}

}``````