RandomAccessFile Java - complexity

i am using RandomAccessFile in a Java program on Linux that deals with a huge amount of data. so what i am doing is i keep many files, each file contains different information. when i preform the action ``` int x=???//some large number RandomAccessFile rand = new RandomAccessFile("file.txt","r"); rand.seek(x); //the file contains more than x bytes byte b = rand.readByte(); ``` what is the complexity of the program? does the program preform 2 actions in the last 2 lines? one for seeking to the xth byte and one for reading the byte? - in other words the whole file is in one consecutive location on the disk(like an array)? or does it preform x actions for the seek and one for the reading? thank you Matt