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copied!<p>Some guesses, related to mr Skeets answer and your apparent confusion...</p> <p>Are you sure you are not inserting the <strong>whole line</strong> in the TreeSet? If you are going to use ONLY the second column, you will need to split() the strings (representing the lines) into columns - that's nothing that's done automatically.</p> <p>Also, If you are actually trying to sort the whole file using the second column as key, You will need a <strong>TreeMap</strong> instead, and use the 2:nd column as key, and the whole line as data. But that won't solve the splitting, it only to keep the relation between the line and the key.</p> <p>Edit: Here is some terminology for you, you might need it.</p> <p>You have a <code>Set</code>. It's a collection of other objects - like <code>String</code>. You <code>add</code> other objects to it, and then you can fetch all objects in it by <code>iterating</code> through the set. Adding is done through the method <code>add()</code>and iterating can be done using the enhanced <code>for loop</code> syntax or using the <code>iterator()</code> method.</p> <p>The set doesn't "grab" or "take" stuff; You <code>add</code> something to the set - in this case a <code>String</code> - Not an array of Strings which is written as <code>String[]</code> </p> <p>(Its apparently possible to add array to a TreeSet (they are objects too) , but the order is not related to the contents of the String. Maybe thats what you are doing.)</p> <pre><code>String key = splittedLine[1]; // 2:nd element </code></pre> <p>"The second element of the keys" doesn't make sense at all. And what's the duplicates you're talking about. (note the correct use of apostrophes... :-)</p>

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