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javaclassinheritanceinstanceof

Weird behaviour of if(x instanceof X)

I have a class PartA and a class PartB which is a derived class of PartA. I have a list of type PartA which holds both parts a and b. And I need to determine which kind of class it actually is when I loop through it. But if I do this:

for (PartA i : parts) {
    if (i instanceof PartA) {
        //some logic
    }

It will still give true regardless of which class it actually is: a or b.

Am I doing something wrong or if not, what can I do to acheive desired result?

Solution

  • This behavior is by design.
    Instance of B are also instances of A.

    You want

    if (i.getClass() == A.class)