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Editorial Team
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Asked: 2026-05-22T21:01:57+00:00

List<List<Integer>> sets = new ArrayList<ArrayList<Integer>>(); Why does the above give a compiler error and

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List<List<Integer>> sets = new ArrayList<ArrayList<Integer>>();

Why does the above give a compiler error and why can i not use the generic list reference here, why do I need to make it specific arraylist reference ?

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1 Answer

  1. Editorial Team

    For that to compile, you would need either:

    List<? extends List<Integer>> sets = new ArrayList<ArrayList<Integer>>();

    or

    List<List<Integer>> sets = new ArrayList<List<Integer>>();
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