compare, checking and listing

[Boon Chong Ang]

Hi,
I have two array, @test1, @test2. Just say, I want compare @test2 with
@test1 in such manner. @test2 could contains more, less or equal
elements compare to @test1 which I don't know.
I want to write a perl script to compare @test2 to @test1 and list out
those element within @test2 that is not represent within @ test1 and
those elements within @test1 that has not found the match from the
@test2
 
How do I accomplish such task efficiently?
 
Thank you & best regards,
ABC