Answer by user253751 for Adding an arrayList of random type to an arrayList
If you want an ArrayList which contains ArrayLists with unknown contents, use the type ArrayList<ArrayList<?>> for the outer list. This code should compile with no problems:...
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So I have looked a lot online on how to do this and what I get is this ArrayList<ArrayList<Type>> arrayLists = new ArrayList<ArrayList<Type>>(); ArrayList<TypeA> typeA =...
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