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POComparator for TreeSet doesn't work as wanted
 

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  1. POComparator for TreeSet doesn't work as wanted
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    <p>My idea was to sort some entities (which are just some integers) by their layers. I found someone who seemed to have the same problem (I think) but I didn't understand the solution. The layers of each entity is stored in an array. I used a an enumaration for the layers.</p> <pre><code>public enum Layer { DEFAULT, BACKGROUND, FOREGROUND, HUD_0, HUD_1 } </code></pre> <p>So I don't know if I misunderstood the way a comparator works or if i just have problems because the entities are Integers...</p> <pre><code>final Layer[] layers = {Layer.BACKGROUND, Layer.HUD_1, Layer.DEFAULT, Layer.DEFAULT, Layer.HUD_0, Layer.HUD_1}; TreeSet&lt;Integer&gt; sorted = new TreeSet&lt;Integer&gt;(new Comparator&lt;Integer&gt;() { @Override public int compare(Integer entity1, Integer entity2) { //Integer layer1 = layers[entity1].ordinal(); //Integer layer2 = layers[entity2].ordinal(); //return layer1 &lt; layer2 ? -1 : (layer1 &gt; layer2 ? 1 : 0); return layers[entity1].compareTo(layers[entity2]); } }); sorted.add(0);//bg System.out.println(sorted.toString()); sorted.add(4);//hud0 System.out.println(sorted.toString()); sorted.add(2);//def System.out.println(sorted.toString()); sorted.add(3);//def System.out.println(sorted.toString()); sorted.add(1);//hud1 System.out.println(sorted.toString()); sorted.add(5);//hud1 System.out.println(sorted.toString()); </code></pre> <p>This is the output:</p> <pre><code>[0] [0, 4] [2, 0, 4] [2, 0, 4] [2, 0, 4, 1] [2, 0, 4, 1] </code></pre> <p>the last should actually be [2, 3, 0, 4, 1, 5]</p> <p>I read that a TreeSet stores every element just once since it is a Set but I don't know why its using the layer for that and not the entities which i actually want insert.</p>
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