CODEWITHSUNDEEP
javapoint
Jotaro
Jotaro

Reputation: 727

How to store doubles in a point?

I am trying to create several points in a java program. The coordinates of the points are in a text file, which I scan in and read number by number.

   double x = 0.0;
   double y = 0.0;

   Point origin = new Point(x, y);
   Point[] points = new Point[1000]; // There are 1000 points in total, thus 2000 doubles, this array will be used to store all the points

   Scanner keyboard = new Scanner(System.in);
   String FileName = keyboard.nextLine();       
   Scanner linReader = new Scanner(new File(FileName));

   while (linReader.hasNextDouble()) {     
       x = linReader.nextDouble();
       y = linReader.nextDouble(); 

       origin = (x, y); // error telling me 'cannot convert from double to point'
       }

I get the error "cannot convert from double to a point" so I need to know how to I fix this error? Am I allowed to use doubles coordinates for points?

Upvotes: 2

Views: 11640

Answers (5)

Muhammad Ayesh
Muhammad Ayesh

Reputation: 11

Use this class:

import org.springframework.data.geo.Point;

maven:

<dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>

Upvotes: 0

Shubhankar S
Shubhankar S

Reputation: 460

Heres a minimum change solution:

   double x = 0.0;
   double y = 0.0;

   Point origin;
   Point[] points = new Point[1000]; // There are 1000 points in total, thus 2000 doubles, this array will be used to store all the points

   Scanner keyboard = new Scanner(System.in);
   String FileName = keyboard.nextLine();       
   Scanner linReader = new Scanner(new File(FileName));

   while (linReader.hasNextDouble()) {     
       x = linReader.nextDouble();
       y = linReader.nextDouble(); 

       origin  = new Point(x, y);
       }

You could also implement your own Point class something like this

    public class Point {

      double x;
      double y;

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

     public double getX(){
       return this.x;          
     }

     public double getY(){
       return this.y;          
     }
   }

Hope this helps

Upvotes: -1

seal
seal

Reputation: 1143

Point class won't give the double precision. For the double precision you need to use Point2D.Double class. Consider the following code as example. 

    static void pointTest() {
      double x = 1.2;
      double y = 3.4;
      Point2D.Double pointDouble = new Point2D.Double(x, y);
      System.out.println(pointDouble);
    }

Upvotes: 3

c0der
c0der

Reputation: 18792

public static void  main(String args[]) {

    //// Alternative 1 
    double x = 9.7;
    double y = 8.6;

    //import com.sun.javafx.geom.Point2D;
    Point2D point2D = new Point2D();
    point2D.x = (float) x; point2D.y= (float) y;


    ///// Alternative 2 (lose some accuracy) 
    //use Double object   
    Double x1 = 9.7;
    Double y1 = 8.6;
    //import java.awt.Point;
    Point origin = new Point(x1.intValue(), y1.intValue());
}

Upvotes: 0

Abtin Gramian
Abtin Gramian

Reputation: 1780

Seems more straightforward to do it like this:

List<Point> points = new ArrayList<Point>(1000);

...

    points.add(new Point(x, y));

Upvotes: -1

Related Questions