Question

public static void method(Set<?>... sets){}

Depending on program flow, above method is called with two sets, or with three sets, or more. (Not known at compile time).

Is there a way to constructing the argument list “on the fly”?
sets is of type Set< ?>[ ]

Following was not fruitful:

Set<Set<Integer>> varargs = new HashSet<Set<Integer>>();

(method recognizes varargs just as one set -> no solution)

Set<Integer>[] varargs = new HashSet<Integer>[2];

returns

"Cannot create generic array of HashSet<Integer>" 

I would like to construct an array of arguments, while array size and content is filled at runtime.

Answer 1

 Set<Integer>[] varargs = new HashSet[2];
 varargs[0] = new HashSet<Integer>() ;