Roman Roman - 2 months ago 9
Java Question

Iterating over arrays by reflection

I am doing some reflection work and go to a little problem.

I am trying to print objects to some GUI tree and have problem detecting arrays in a generic way.

I suggested that :


object instanceof Iterable


Would make the job ,but it does not, (obviously applies only to Lists and Set and whoever implements it.)

So how is that i would recognice an Array Some
Object[]
, Or
long[]
or
Long[]
.. ?

Thanks

Answer

If you don't want only to check whether the object is an array, but also to iterate it:

if (array.getClass().isArray()) {
    int length = Array.getLength(array);
    for (int i = 0; i < length; i ++) {
        Object arrayElement = Array.get(array, i);
        System.out.println(arrayElement);
    }
}

(the class above is java.lang.reflect.Array)

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