Sort Three Arrays by ArrayList Index (Row) on a Single Array

Vote count:

0

In an ArrayList I have three double[ ] arrays that I wish to sort on the third array. The third array is also unsorted.

public class LevelList extends ArrayList<double[]> {

My comparator compares doubles:

import java.util.Comparator;

public class Linearize {
     static final Comparator<double[]> RATIO_ORDER = 
             new Comparator<double[]>() {
                 @Override
                 public int compare(double[] d1, double[] d2) {
                     //Sort the ratios based on the fraction column 2
                     return Double.compare(d1[2], d2[2]);
                 }
         };
}

I then call:

Collections.sort(levelList, Linearize.RATIO_ORDER);
levelList.println();

However, this only results in a sorting of the order of arrays in ArrayList.

In pseudocode, what I wish to achieve is:

For Each Row of ArrayList at Index i
Sort on Array 3

So that this input:

[1.0][2.0][2.1]
[2.0][5.0][2.2]
[1.0][5.0][1.0]

becomes:

[1.0][5.0][1.0]
[1.0][2.0][2.1]
[2.0][5.0][2.2]

because: 2.2 > 2.1 > 1.0

asked 23 secs ago

noumenal

184

Sort Three Arrays by ArrayList Index (Row) on a Single Array