Java String Concept query

Question

Guys can you help me to pick only repeated Characters, unique characters and special characters in string using Java program

Example: N@ASA #BASE@

-- I need "N#BE" alone in one output file because these are unique characters in a string
-- in another output file "@AS" should come because those are repeated characters in a string
-- in my 3rd output I need only "@#" alone because those are special characters in a string

Answer 1

ok

Answer 2

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