Answer Posted / lal ajith kumara

Since java.Util.Set is not allowing duplicates u can use it

String[] letters = {"a", "b", "b", "c" ,"a", "d","a"};
Set duplicateTester = new HashSet<String>();
for(int i = 0; i<letters.length;i++){
if(true == duplicateTester.add(letters[i])){
System.out.println("true>>"+letters[i]);

}else{
System.out.println("false>>"+letters[i]);
}

}

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