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group list elements based on an element  RSS feed

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Java MySQL Database Ubuntu
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I've some code below as that I use for querying the db and obtain that in my jsp file ,

The list returned looks something like [prefix1, no1, head1, amt1, prefix2, no2, head2, amt2,]. I'm trying to make a receipt in jsp on the lines of

prefix1/no1 amt1
prefix2/no2 amt 2
prefix3/no3 amt3

So I want to group all records by head column in the receipt - jsp file. How do I go about this? Any help completely appreciated. Please excuse my English.
System.out.println("cash list: "+payincash);
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