Behavior of the FileChannel to RandomAccessFile

I have one use-case where my multiple threads are writing data to same file channel (pooled), and each thread has offset in the file from where they can start writing till the length of the data to be written. So when I ask the file channel from pool it will open the channel in "rw" mode if it already not opened and will return that file channel (the opened file might be fresh file i.e. size = 0), else it will return cached channel. Problem is that thread might write data in no particular, that means a thread with offset 1,000,000 might start writing before thread with offset 0. Consider I opened a fresh file (size = 0), and thread with offset = 1,000,000 starts writing data (using `write(buffer, position)` API) before thread with offset = 0.
My first question: Is this allowed at all, or I will get some exception Secondly if it allowed: What is guarantee that my data is correctly written. Third. When my (offset = 1,000,000) is done with writing to file, what will be the content in empty space (0-999,999). How operating system will allocate this intermediate space?

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