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Sorting Complication

Sam Codean
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Joined: Feb 26, 2006
Posts: 194
Hi All,
I wanted to implement a simple sorting for the JTable (I have cursed sun at least 1,000,000 times for not providing that)

I implemented a simple single level sorting taking help from the TableSorter from the Examples. But there is a small complication.

when there are many rows with same values i just leave the order as it is. But now if i sort it based on column 1 first and then go to column 2 then the order is different and if i go to column 3 first and then to column 2 then t order is different

Please let me know if that is an issue?


-Sam Codean<br />SCJP 1.4 (98%)<br />SCJD 5.0 (87.5%)
Ernest Friedman-Hill
author and iconoclast
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Joined: Jul 08, 2003
Posts: 24187
    
  34

The abililty to sort a collection while leaving equal items in the same order in which they originally appeared is called stability. A stable sort is one that wouldn't have the problem that you describe. The java.util.Arrays.sort(Object[]) method is a stable quicksort -- you could use that.


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Sam Codean
Ranch Hand

Joined: Feb 26, 2006
Posts: 194
Thanks Ernst,
I too have done something similar to what you are telling. But the problem that i am facing i will explain
Suppose there are three rows (simplified though)



So you see that after the step 2 of both the variations even though i am sorting the column 2 and it indeed is sorted but yet the rows with the same City will not be having the same order as it depends on which column was selected earlier.

I was wanting to know if that is fine as long as sorting is done correctly on the column 2
 
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subject: Sorting Complication