Reading Data from file and stored in array.. how that array is input to another method ??

[murali5003]

`/*

• To change this template, choose Tools | Templates
• and open the template in the editor.
  */
  package jarvis;

import java.io.*;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Scanner;

/**

• Class point *
  */
  class Point {

  int x, y;
  }

/**
*

• @author ADMIN
  */
  public class Jarvis {
  private static Point[] points;

  private static boolean CCW(Point p, Point q, Point r) {
  int val = (q.y - p.y) * (r.x - q.x) - (q.x - p.x) * (r.y - q.y);

  if (val >= 0) {
      return false;
  }
  return true;
  

  }

  public static void convexHull(Point[] points) {
  int n = points.length;
  /**
  * if less than 3 points return *
  */
  if (n < 3) {
  return;
  }
  int[] next = new int[n];
  Arrays.fill(next, -1);

  /**
   * find the leftmost point *
   */
  int leftMost = 0;
  for (int i = 1; i < n; i++) {
      if (points[i].x < points[leftMost].x) {
          leftMost = i;
      }
  }
  int p = leftMost, q;
  /**
   * iterate till p becomes leftMost *
   */
  do {
      /**
       * wrapping *
       */
      q = (p + 1) % n;
      for (int i = 0; i < n; i++) {
          if (CCW(points[p], points[i], points[q])) {
              q = i;
          }
      }
  
      next[p] = q;
      p = q;
  } while (p != leftMost);
  
  /**
   * Display result *
   */
  display(points, next);
  

  }

  public static void display(Point[] points, int[] next) {
  System.out.println("\nJarvis March Convex Hull points : ");
  for (int i = 0; i < next.length; i++) {
  if (next[i] != -1) {
  System.out.println("(" + points[i].x + ", " + points[i].y + ")");
  }
  }
  }

  /**

  • @param args the command line arguments
    */
    public static void main(String[] args) throws IOException {

    int[] data = readfiles("nani.txt");
    System.out.println(Arrays.toString(data));
    Jarvis j = new Jarvis();
    Jarvis.convexHull(points);

  }

  public static int[] readfiles(String file)
  {

try
{
File f = new File(file);
Scanner scan = new Scanner(f);
List arr;
arr = new ArrayList<>();
int crr = 0;

while(scan.hasNextInt()) 
{
    arr.add(scan.nextInt());
    System.out.println(arr.get(crr++));
}


System.out.println("Jarvis Algorithm Test\n");

System.out.println(crr);
scan.useDelimiter(",|\\s*");



/** Make an object of Jarvis class **/
int n = crr;
System.out.println(n);
System.out.println("Reading X,Y Values From File");
for (int i = 0; i < n; i++) {


    Point[] points = new Point[n];



    points[i] = new Point();
    points[i].x = arr.get(i);
    points[i].y = arr.get(i+1);

    //i=i+1;
    System.out.println("(x,y) values are:" + points[i].x + "\t" + points[i].y);

}

    scan.close();

        }
            catch (FileNotFoundException e)
            {
                e.printStackTrace();
            }
    return null;

}
}

`

[murali5003]

Iam Getting output like this.. here reading is also fault.. 1,2 as first point and 6,4 as my second point.. like this it should be read.. but here fault
run:
1
2
6
4
8
7
2
3
12
13
9
1
Jarvis Algorithm Test

12
12
Reading X,Y Values From File
(x,y) values are:1 2
Exception in thread "main" java.lang.IndexOutOfBoundsException: Index: 12, Size: 12
(x,y) values are:2 6
(x,y) values are:6 4
(x,y) values are:4 8
(x,y) values are:8 7
(x,y) values are:7 2
(x,y) values are:2 3
(x,y) values are:3 12
(x,y) values are:12 13
(x,y) values are:13 9
(x,y) values are:9 1
at java.util.ArrayList.rangeCheck(ArrayList.java:653)
at java.util.ArrayList.get(ArrayList.java:429)
at jarvis.Jarvis.readfiles(Jarvis.java:143)
at jarvis.Jarvis.main(Jarvis.java:97)
Java Result: 1
BUILD SUCCESSFUL (total time: 0 seconds)