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JavaFX | Point2D Class
• Last Updated : 14 Aug, 2018

Point2D class is a part of JavaFX. This class defines a 2-dimensional point in space. The Point2D class represents a 2D point by its x, y coordinates. It inherits java.lang.Object class.

Constructor of the class:

• Point2D(double x, double y): Create a point2D object with specified x and y coordinates.

Commonly Used Methods:

Method Explanation
distance(double x1, double y1) Calculates the distance between this point and point (x1, y1).
distance(Point2D p) Calculates the distance between this point and point p.
equals(java.lang.Object obj) Returns whether this object is equal to the specified object or not
getX() Returns the x coordinate of the point
getY() Returns the y coordinate of the point
hashCode() Returns a hash code value for the point.

Below programs will illustrate the use of the Point2D class:

1. Java program to create a point 2D object and display its coordinates and find its distance from origin: In this program we create a Point2D object named point2d_1 by using its x, y coordinates as arguments. We will get the values of x, y using the getX(), getY() function and after that display it. We are also calculating the distance of the points from the origin.

 `// Java program to create a point 2D  ` `// object and display its coordinates ` `// and find its distance from origin ` `import` `javafx.geometry.Point2D; ` ` `  `public` `class` `Point2D_1 { ` ` `  `    ``// Main Method ` `    ``public` `static` `void` `main(String args[]) ` `    ``{ ` ` `  `        ``// Create a point2D object ` `        ``Point2D point2d_1 = ``new` `Point2D(``20``.0f, ``150``.0f); ` ` `  `        ``double` `x, y; ` ` `  `        ``// get the coordinates of the point ` `        ``x = point2d_1.getX(); ` `        ``y = point2d_1.getY(); ` ` `  `        ``// display the coordinates of the point ` `        ``System.out.println(``"x coordinate = "` `+ x  ` `                      ``+ ``", y coordinate = "` `+ y); ` ` `  `        ``// print its distance from origin ` `        ``System.out.println(``"distance from origin = "`  `                        ``+ point2d_1.distance(``0``, ``0``)); ` `    ``} ` `} `

Output:

```x coordinate = 20.0, y coordinate = 150.0
distance from origin = 151.32745950421557
```

2. Java program to create 3 Point2D objects and display their coordinates and distance from the origin and check which of the 3 points are similar and their distances between two points: In this program we create 3 Point2D object named point2d_1, point2d_2, point2d_3 by passing its x, y coordinates as arguments. We get the x, y values using the getX(), getY() function and then display it. We are also calculating the distance of the point from the origin and displaying it for each of the three points. We are also displaying whether any two points are equal or not using equals() function and the distance between two points using the distance() function.

 `// Java program to create 3 Point2D objects and display ` `// their coordinates and distance from origin and ` `// check which of the 3 points are similar and  ` `// their distances between two points ` `import` `javafx.geometry.Point2D; ` ` `  `public` `class` `Point2D_2 { ` ` `  `    ``// Main Method ` `    ``public` `static` `void` `main(String args[]) ` `    ``{ ` ` `  `        ``// Create three point2D objects ` `        ``Point2D point2d_1 = ``new` `Point2D(``120``.0f, ``50``.0f); ` `        ``Point2D point2d_2 = ``new` `Point2D(``120``.0f, ``50``.0f); ` `        ``Point2D point2d_3 = ``new` `Point2D(``200``.0f, ``120``.0f); ` ` `  `        ``// Display the coordinates of the 3 points ` `        ``display(point2d_1); ` `        ``display(point2d_2); ` `        ``display(point2d_3); ` ` `  `        ``// Check whether any point is equal to other or not ` `        ``System.out.println(``"Point 1 equals Point 2 = "`  `                        ``+ point2d_1.equals(point2d_2)); ` ` `  `        ``System.out.println(``"Point 2 equals Point 3 = "`  `                        ``+ point2d_2.equals(point2d_3)); ` ` `  `        ``System.out.println(``"Point 3 equals Point 1 = "`  `                        ``+ point2d_3.equals(point2d_1)); ` ` `  `        ``// distance between two points ` `        ``System.out.println(``"Distane between point 1 and point 2 = "`  `                                  ``+ point2d_1.distance(point2d_2)); ` ` `  `        ``System.out.println(``"Distane between point 2 and point 3 = "`  `                                   ``+ point2d_2.distance(point2d_3)); ` ` `  `        ``System.out.println(``"Distane between point 3 and point 1 = "`  `                                    ``+ point2d_3.distance(point2d_1)); ` `    ``} ` ` `  `    ``// display method ` `    ``public` `static` `void` `display(Point2D point2d) ` `    ``{ ` ` `  `        ``double` `x, y; ` ` `  `        ``// get the coordinates of the point ` `        ``x = point2d.getX(); ` `        ``y = point2d.getY(); ` ` `  `        ``// display the coordinates of the point ` `        ``System.out.println(``"x coordinate = "` `+ x  ` `                      ``+ ``", y coordinate = "` `+ y); ` ` `  `        ``// print its distance from origin ` `        ``System.out.println(``"Distance from origin = "`  `                          ``+ point2d.distance(``0``, ``0``)); ` `    ``} ` `} `

Output:

```x coordinate = 120.0, y coordinate = 50.0
Distance from origin = 130.0
x coordinate = 120.0, y coordinate = 50.0
Distance from origin = 130.0
x coordinate = 200.0, y coordinate = 120.0
Distance from origin = 233.23807579381202
Point 1 equals Point 2 = true
Point 2 equals Point 3 = false
Point 3 equals Point 1 = false
Distane between point 1 and point 2 = 0.0
Distane between point 2 and point 3 = 106.30145812734649
Distane between point 3 and point 1 = 106.30145812734649
```

Note: The above programs might not run in an online IDE. Please use an offline compiler.

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