Java：将多个int数组写入二进制文件以获得反向索引

I am currently doing a inverted index project in Java that will write arrays of int to a binary file and then save the offsets and how much bytes to read for each array, so it can be read back into memory later on. How will I be able to do that? I have never dealt with binary files before, so I have no idea where to begin.I am currently doing a inverted index project i