How to Merge the elements of two separate lists into a single one .

Hi ,
I am unable to add elemnts of 2 separate Lists suppose list1= { HashmapA, HashMapB}
List2 = { HashmapC, HashMapD } into the third list List3 whose elements should be
{ HashmapA, HashMapB,HashmapC, HashMapD } .
I am trying Collections.addAll(List3 ,List2 ,list1)
but it is giving me a list whose elements are 2 lists( 0 -> list1,1->list2) and not { HashmapA, HashMapB,HashmapC, HashMapD }.
Can anyone help me out with this !!!!!

I am unable to add elemnts of 2 separate Lists suppose list1= { HashmapA, HashMapB}
List2 = { HashmapC, HashMapD } into the third list List3 whose elements should be
{ HashmapA, HashMapB,HashmapC, HashMapD } .
You can also try
Set<T> union = new HashSet<T>(list1);
union.addAll(list2);Assuming you want to get rid of the duplicates. Replace T with the actual type of your elements.

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