java - Accepting different Set-implementations as parameter -


i trying write function capable of accepting 1 of these 2 objects parameter:

private static treeset<string> treeset = new treeset<string>(); private static hashset<string> hashset = new hashset<string>();

i've attempted 

public static void printset(set s) {   // }

and

public static void printset(set<string> s) {   // }

even while casting sets @ invocation error. proper way this?

update 1

i've tried , without casting:

printset(set); printset((set) set); printset((set<string> set);

update 2

the error:

exception in thread "main" java.lang.classcastexception: treeset cannot cast java.util.set @ hashtreesetclient.main(hashtreesetclient.java:34)

just use generics did.

public static <t> void printset(set<t> s) {   // }

avoid raw types.

or set<string> s else said.

public static void printset(set<string> s) {   // }

set interface every class implement interface accepted in method.


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