In my application I am using a third-party API. It is a non-blocking method which returns immediately. I have a collection of elements over which I have to invoke this method.

Now, my problem is that I have to find a way till all the method execution gets completed and do my next operation. How can I handle this? I cannot modify the third-party API.

In short it looks like this

for(Object object: objects){
 methodA(object); //this is a non-blocking call and returns immediately
}
// here I want to do my next task only after all the methodA calls completed execution