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2013-07-10T18:00:22.630
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2013-07-10T18:00:22.630
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I know the question was asked long ago but actually i had the same problem. If you dont know how many variables you would have on list but this is not a big number you could just implement comparator for every choose. eg I have <code>ArrayList<ArrayList<Object>></code> and want to sort it by column's and i know that the nested list consist of variable number of objects i can just implement comparator for every possible value: <pre><code>public class SecondColumnComparator implements Comparator { public static boolean isNumeric(String str) { try { Integer integer = Integer.parseInt(str); } catch (NumberFormatException nfe) { return false; } return true; } @Override public int compare(Object o1, Object o2) { if (isNumeric(((ArrayList<String>) o1).get(1))) { Integer firstInteger = Integer.parseInt(((ArrayList<String>) o1).get(1)); Integer secondInteger = Integer.parseInt(((ArrayList<String>) o2).get(1)); return firstInteger.compareTo(secondInteger); } if (((ArrayList<Object>) o1).get(1) instanceof String) { String firstString = ((ArrayList<String>) o1).get(1); String secondString = ((ArrayList<String>) o2).get(1); return firstString.compareTo(secondString); } throw new Exception(); } </code></pre> } And call this this way: <pre><code> switch (valueSelected) { case 0: Collections.sort(this.listOfLists, new FirstColumnComparator()); break; case 1: Collections.sort(this.listOfLists, new SecondColumnComparator()); break; case 2: Collections.sort(this.listOfLists, new ThirdColumnComparator()); break; case 3: Collections.sort(this.listOfLists, new FourthColumnComparator()); break; default: } </code></pre> In every comparator just modifying <code>.get(x)</code> where x is number of collumn by which you want sort. The <code>boolean isNumeric(String str);</code> function may be used because you cant store different type of objects on one list so I put the recognition of this to the comparator and parse String to any other type. Remember that this <code>comparator</code> and its "calculations" are called to every single comparison made by algorithm so it is extremely inefficient... Despite this fact this is kind of sollution. 
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1. POJava 2D ArrayList and sorting
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1. USJacob
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