Question

I need to write an arraylist to a file.
It gets filled all the time and when it gets too big I need to start writing it.

So I thought to check when the arraylist sise is greater then 100 and then append the file and write the current rows .
But the problem is sometimes it doesnt get filled for a few minuettes and I will want to dump the data to a file.
So my second thought was to have another thread that will check if there are rows every few sec and dump it to the file.
But than I would need to manage locks between threads.

My questions are :
1. Is the multithread design ok ?
2. Is there an arraylist that supports multithread in any form ?

Answer 1

You can make synchronized lists using Collections.synchronizedList.