Path: csiph.com!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail
From: Robert Klemme <shortcutter@googlemail.com>
Newsgroups: comp.lang.java.programmer
Subject: Re: array of HashSet<>
Date: Sat, 27 Feb 2016 11:41:18 +0100
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On 27.02.2016 01:12, Roedy Green wrote:
> I take it is impossible to write a valid Java program containing an
> array of HashSet<> s.
>
> Any ideas for a work around?

I am not sure what you are asking.

package cljp;

import java.util.ArrayList;
import java.util.HashSet;

public final class ArrayOfHashSet {

     public static <T> HashSet<T> validProgram() {
         @SuppressWarnings("unchecked")
         final HashSet<T>[] arrayOfHashSets = (HashSet<T>[]) new 
HashSet<?>[10];

         for (int i = 0; i < arrayOfHashSets.length; ++i) {
             arrayOfHashSets[i] = new HashSet<>();
         }

         return arrayOfHashSets[1];
     }

     public static <T> HashSet<T> workaround() {
         final ArrayList<HashSet<T>> arrayOfHashSets = new ArrayList<>();

         for (int i = 0; i < 10; ++i) {
             arrayOfHashSets.add(new HashSet<>());
         }

         return arrayOfHashSets.get(1);
     }
}

Kind regards

	robert

-- 
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/