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Home/ Questions/Q 722403
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Editorial Team
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Editorial Team
Asked: May 14, 20262026-05-14T05:59:07+00:00 2026-05-14T05:59:07+00:00

Primitive types are not allowed in ArrayList, source . Partial solution: you can wrap

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Primitive types are not allowed in ArrayList, source. Partial solution: you can wrap prim.types such as int to Integer to form an extra class but a side effect. I want to index data, is there some substitute for ArrayList that allows primitive types?

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  1. Editorial Team
    Editorial Team
    2026-05-14T05:59:08+00:00Added an answer on May 14, 2026 at 5:59 am

    What version of Java are you using?

    Since 1.5 autoboxing makes this issue moot.

    You can do this:

    List<Integer> x = Arrays.asList(1, 2, 3);
    
    x.get(0) == 1;  // this is true  **WARNING** comments have pointed out this only works for Integers -128 to 127 due to integer caching.  Use .equals
    
    int foo = x.get(1);  // this doesn't need a cast
    
    x.add(4);  // this doesn't need to be wrapped
    
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