Reading file of floats into array list and sorting into subsets

Hello, I am working on an assignment where I need to sort floats into subsets based on deviation. I need to pull the first element out and use it to compare the rest. a good way to think about it is d = first element and a = the first element in the remaining list, and b = the second element in the list. I need to put the floating points into subset where the elements are at least d apart

Example: d= 2 and list {5, 7, 8, 12, 4, 6, 7}
needs to be put into sets {5, 7, 12} {8, 4, 6} {7}

this is what I have so far

Code :

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import java.io.File;
import java.io.FileNotFoundException;
import java.util.ArrayList;
import java.util.Scanner;
import java.util.Collections;
 
public class FloatFromFile
{
	public static void main(String[] args)
	{
		Scanner file = null;
		ArrayList<Float> list = new ArrayList<Float>();
 
		try
		{
			file = new Scanner(new File("test.txt"));
		}
		catch (FileNotFoundException e)
		{
			e.printStackTrace();
		}
 
		while(file.hasNext())
		{
			if (file.hasNextFloat()) list.add(file.nextFloat());
			else file.next();
		}
 
		// display unsorted list
		System.err.print("Origional List is:\n");
		for (Float i: list) System.out.println(i);
 
		Collections.sort(list);
 
		// display sorted list
		System.err.print("Sorted List is:\n");
		for (Float i: list) System.out.println(i);
 
		ArrayList<Float> sorted = new ArrayList<Float>();
		while (file.hasNext())
		{
			Float val = file.nextFloat();
			int i = sorted.size();
			float temp = sorted.get(i-1);
			while (i > 0 && temp > val)
			{
				i--;
				temp = sorted.get(i-1);
			}
			sorted.insert(i, val);
		}
		for (Float i: sorted) System.out.println(i);
 
 
		}
}

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I am getting one error with the sorted.insert(i, val), but I know that is not the only problem. Any help would be great.

We don't read minds. Do you think that posting the exact error message might be helpful?

Quote:

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Originally Posted by Junky

We don't read minds.

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Speak for yourself... at the moment, I'm sensing that you're tired and grumpy!
And believe me, that was no party trick, It's just something you pick up from a year of JavaPenguin :)