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Home/ Questions/Q 7588815
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Editorial Team
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Editorial Team
Asked: May 30, 20262026-05-30T20:01:01+00:00 2026-05-30T20:01:01+00:00

In an ArrayList for android such as the simplelistadapter I commonly see ArrayList<?> and

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In an ArrayList for android such as the simplelistadapter I commonly see ArrayList<?> and in some tutorials I’ve reviewed the <?> is replaced by some value. But I’m still not quite sure what variable or qualifier this stands for.

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  1. Editorial Team
    Editorial Team
    2026-05-30T20:01:02+00:00Added an answer on May 30, 2026 at 8:01 pm

    It’s called Generics.

    For example, you can do this:

    ArrayList<Integer> list = new ArrayList();
    list.add(new Integer(1));
    list.add(new Integer(2));
    .....
    
    Integer i = (Integer)list.get(1);
    

    Or you can do:

    ArrayList<Integer> list = new ArrayList<Integer>();
    list.add(new Integer(1));
    list.add(new Integer(2));
    .....
    
    Integer i = list.get(1);
    

    As you can see, no need for casting.

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