Attempting to Create HashSets

This is probably very easy, but I need a way to use public voids, or something similar, to create HashSets. Example:

Code (Text):

@EventHandler
public void onEnable() {

for (String name : getConfig().getStringList("Chat.Channels")) {
CreateHash(name);
}
}

public void CreateHash(String name) {
 
  create new hashset in here

}

I need it to automatically create hashsets.

 

Yes, I am just confused & sick atm.

 

HashSet<Collection> name = new HashSet<Collection>();

 

I need to be able to access them from another class.