Gregor Berenbaum

A file is a named collection of related information that is recorded on secondary storage such as magnetic disks, magnetic tapes and optical disks. In general, a file is a sequence of bits, bytes, lines or records whose meaning is defined by the files creator and user.

A File Structure should be according to a required format that the operating system can understand.

File type refers to the ability of the operating system to distinguish different types of file such as text files source files and binary files etc. Many operating systems support many types of files. Operating system like MS-DOS and UNIX have the following types of files −

These files are of two types −

File access mechanism refers to the manner in which the records of a file may be accessed. There are several ways to access files −

A sequential access is that in which the records are accessed in some sequence, i.e., the information in the file is processed in order, one record after the other. This access method is the most primitive one. Example: Compilers usually access files in this fashion.

Files are allocated disk spaces by operating system. Operating systems deploy following three main ways to allocate disk space to files.

Inside main , call the myMethod() method: public class Main { static void myMethod() { Systemoutprintln("I just got executed!"); } public static void main(String[] args) { myMethod(); } } // Outputs "I just got executed!"

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