If a file contains an index directory that allows for random access, what does it mean?

This article focuses on file extensions and the software that generate them. It is critical to have examples.

If a file is set with the immutable flag, what security controls does this provide for the file?

createDatabaseOfProfiles(String filename) This method creates and populates the database array with the profiles from the input file (profile.txt) filename parameter. Each profile includes a persons' name and two DNA sequences. 1. Reads the number of profiles from the input file AND create the database array to hold that number profiles. 2. Reads the profiles from the input file. 3. For each person in the file 1. creates a Profile object with the information from file (see input file format below). 2. insert the newly created profile into the next position in the database array (instance variable).