Getting intValue from Integer, does it make any sense?

Question

I am looking through the code someone wrote a while back and wondering whether I am missing something here

Assuming

List<Integer> runUids = new ArrayList<Integer>();

and later on as part of a loop

int runUID = runUidsAL.get(i).intValue();

Is there any reason why intValue() needs to be called here?. Don't think it's needed here. Do you?

Answer 1

You didn't say so, but I assume that runUID is an int.

It's not necessary to call intValue() explicitly on the Integer object returned by runUidsAL.get(i); Java will do this automatically by auto-unboxing.

Answer 2

A real situation that I have lived a few minutes ago:

I have a list of Integer objects. Each Integer is the index of an other list whose positions I want to remove.

Then... I was doing that:

for (Integer index : positionsToRemoveList) {

   historyRecord.remove(index);
}

Java was calling to the next method

public boolean remove(Object object);

Instead of:

public E remove(int location);

My "historyRecord" List wasn't being updated beacuse Java was trying to remove by an Object instead of by position.

The right way is:

for (Integer index : positionsToRemoveList) {

   historyRecord.remove(index.intValue());
}

And this is my real story : )