How to merge 2 Collections? . . .

Hey All,
Can anyone tell me the best way I can merge 2 Collections? I tried using the Collection.addAll(Collection c) method, but I get an UnsupportedOperationException.
Thanks for any help in advance,
Peter

The Collection type is a proprietary type. The Collection I'm getting back comes from a call to a JDO (Java Data Objects) driver. I don't have the source code so I don't know exactly. I used reflection and called Class.getName() on the object only to get back an Object type that is a proprietary type written by the vendor.
I also tried converting the Collections into arrays (using the Collection.toArrray() method) only to find out that the size of the array returned is sometimes less than the size of the Collection the array was generated from (I used Collection.size() to find out the size of the Collection). I was hoping to use System.arraycopy() to merge the 2 arrays returned from the 2 Collections.
Any ideas?

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This is my code unable to merge the to tabs position is on 3rd and 4th.
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From Your code I saw that you called Macro of fieldcat after Calling the ALV Function Did You Check That One.
Following links may be useful for you ,
ALV report: How to merge 2 columns into 1 column?
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Edited by: Manoj Kumar on Jan 23, 2009 12:20 PM
Edited by: Manoj Kumar on Jan 23, 2009 12:21 PM

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