Put certain elements of an arraylist of arrays into a hashset

I have an arraylist of arrays. I now need to create a separate list that contains unique combinations of only 3 values contained in the underlying array in the arraylist. I think I can use a HashSet. I am just not sure how to create the HashSet?
I could create an ArrayList of just those 3 values and then use the add method but again I'm not sure how to create the ArrayList based on sub-elements of the original ArrayList. (i.e. copy three "variables" from the array in the arraylist to the new array for each member of the arraylist.)
Any help would be greatly appreciated.

Let us just say I want to. I would prefer a solution to my original problem. Comments asking (well exclamation points are more "demand" then "ask") for justification are irrelevant to my solution. Just work with the problem I have please. Thanks.
Again. I have an arraylist of arrays. I would like to create a nonduplicate subset of only 3 members of the arrays contained in the arraylist. I believe a hashset will do this.
I have tried this as a test..trying to make a hashset of two subelements:
 HashSet hs = new HashSet();
 for (int counter=0; counter<allocations.size(); counter++)
 hs.add({((double[])allocations.get(counter))[1], ((double[])allocations.get(counter))[2]});
 ..but unfortunately I get this error:
mcp.java:227: illegal start of expression
hs.add({((double[])allocations.get(counter))[1], ((double[])allocations.get(counter))[2]});
^
mcp.java:227: ')' expected
hs.add({((double[])allocations.get(counter))[1], ((double[])allocations.get(counter))[2]});
^
so I am obviously not putting the hashset together correctly.

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^
1 error
Process completed.
So I would of thought that meant use the getContent method from Q object with element bieng 3?

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www.pziecina.com

Put certain elements of an arraylist of arrays into a hashset

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