如何检查类类型并查看其是否实现了接口

Question

I have an arrayList with a number of different objects including Log , Frog , Turtle , Rock etc. I would like to perform some action that only applies to the class types that implements and interface, IAction .

Is there something built in in Java that can do this? My attempt:

for(Object o : objectList){
    if(o.getClass instanceof IAction){ // doesnt work
        // doWork
    }
}

Answer 1

You check the instance, not the class:

for (Object o : objectList){
    if (o instanceof IAction) { 
        // doWork
    }
}