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Random Access Files Homework Help

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What are Random Access Files

A) We have a class that allows opening a file in the read-write mode so that we can perform the read and write operations using the same object. The class is a Random Access, File class.

B) Random Access File class supports all the functionalities using which we can read or write data from or into a file in the form of their primitive data types. Some of such functions are written Int (), write float () e. t. c.

C) Random Access File class has some functionality that supports the manipulation of the file pointer.

 

Examples:

Seek (): moves the file pointer to a specific location

Length (): gives the length of the file.

Get file pointer (): gives the current location of the file pointer.

 

Note:

Random Access File class is a byte-oriented class. It reads or writes data internally in the form of bytes.

The constructor of the Random Access File class is defined to accept two arguments.

a) Name of the file – a string class object

b) Mode – a starting class object

 

Mode:

Specifies whether the file has to be opened in the read mode (“ r “) or read/ write mode (“ r w”).

 

What are the uses of the Random Access File class

A) Whenever we need to store structured data in a file, then we use the Random Access, File class.

B) In the olden days, the Random Access File class was the key issue in developing the projects.

C) Even today, we use the Random Access File class in some projects where we want to read the data from the files and store them into the database.

 

Note:

Whenever the constructor of a class is assumed to throw checked exceptions, then we can’t create an object of the class directly at the place of declaring the instance variables, we define the references of that class as instance variables.

 

Read Records

After all the records are entered into the file, then each record is read from the file and displayed on the screen. The logic is implemented in such a way that, while writing a record into the file, the file pointer will be at the end of the file position. While reading the records, the file pointer points to the 0th location.

Random Access Files Homework Help