Exception in thread "main" java.lang.IndexOutOfBoundsException

Question

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Java

image

image-recognition

, +

I am trying to get rgb values for specific pixels "interest points"

Java

for (int i = 0; i <=locations_original.size();i++)
 {

     System.out.println("x,y: " + locations_original.get(i).x + ", " +
     locations_original.get(i).y);
     Double x=locations_original.get(i).x;
     Double y=locations_original.get(i).y;
     int pixel = image.getRGB(x.intValue(),y.intValue());
     printPixelARGB(pixel);
 }

Java

 public static void printPixelARGB(int pixel) {
     int alpha = (pixel >> 24) & 0xff;
     int red = (pixel >> 16) & 0xff;
     int green = (pixel >> 8) & 0xff;
     int blue = (pixel) & 0xff;
     System.out.println("argb: " + alpha + ", " + red + ", " + green + ",
     " + blue);
}

but there is an error in this line

Java

System.out.println("x,y: " + locations_original.get(i).x + ", " +locations_original.get(i).y);

Quote:

as following

Java

Exception in thread "main" java.lang.IndexOutOfBoundsException: Index: 8, Size: 8
	at java.util.ArrayList.rangeCheck(Unknown Source)
	at java.util.ArrayList.get(Unknown Source)
	at boofcv.ExampleInterestPoint.main(ExampleInterestPoint.java:555)

How can I fix this?

Regards!

Posted 27-May-14 20:15pm

Bebo_1

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2 solutions

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Sergey Alexandrovich Kryukov · Accepted Answer · 2014-05-27T21:21:00

Solution 2

Most likely, the line

Java

for (int i = 0; i <= locations_original.size(); i++)

should be replaced with

Java

for (int i = 0; i < locations_original.size(); i++)

Do I even have to explain why? This is elementary mathematics; and most developers catch this bug from the first glance, at the level of reflexes, because right code is a very common pattern: a range of N elements is indexed from 0 to N−1.

—SA

Posted 27-May-14 21:21pm

Sergey Alexandrovich Kryukov

Comments

Bebo_1 28-May-14 9:14am

Thanks!

Sergey Alexandrovich Kryukov 28-May-14 11:53am

You are very welcome.
Good luck, call again.
—SA

Mohd Akram · Accepted Answer · 2014-05-27T21:05:00

Solution 1

there is a problem in your loop initialization ....
it should be like ....

Java

for (int i = 0; i <locations_original.size();i++){...}

Posted 27-May-14 21:05pm

Mohd Akram

Updated 27-May-14 21:25pm

v2

Comments

Bebo_1 28-May-14 9:14am

Thanks!