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Tuesday, 29 January 2013

Defintion|define of File programming in java with example how to read a|what is|are volatile|non volatile application|Byte|Character Stream

File programming in java File programming in java with example how to read a file in java programming
file programming in java example what is file programming in java what is volatile application in java
what are volatile applications in java what is non volatile application in java what are non volatile applications in java Byte stream in java character stream in java definition of File define file programming definition of File programming define file 

File Programming:

         In the context of file programming java programmer can write two types of application 
      they are

       1)  Volatile Application.
       2)  Non-Volatile Application.

   Volatile or Non-Persistent Application:

                     Volatile Application is one which results are available in the main memory. We  
    know that anything is storing in main memory is temporary i.e: as long as power is on the 
   data will be available in main memory and once the power is off the data of the main memory 
   is lost.

  Non-Volatile or Persistent Application:

                  The non-volatile or persistent application is one whose basic aim to store the result 
    of java program in the persistently devices permanently.
    We know that to store data permanently, information technology we have two approaches 
    they are.

          a)  Through the concept of Files.
          b)  Through the concept of Data Base.
             If we store the data permanently in the form of files then any unauthorized user can   
   manipulate the data of the file. In any programming language the concept of files is unable 
   to provide enough security to the confidential data from the unauthorized user. Hence Files 
   are providing no security to the data. Hence industry is not recommended for storing the data 
   in the form of files.

           If we store the data permanently in the popular databases(oracle, mysql, db2 etc…)
   Then the data of the database is not possible to manipulated by unauthorized users
   because databases provides enough security in the form of usernames and passwords 
   to secure the confidential data from unauthorized users. Hence industry is always  
   recommended to store the data permanently in the form of databases but not in the form 
   of files.

  In order to deal with File Programming of java we must import a predefined package 

  Definition of File:

               A File is collection of records. And a Record is a collection of Filed values.
File names are always residing in secondary memory. If we want to store any temporary 
data permanently then we need to choose the file name and write the data into file.

In java programming object which is residing in the main memory is becoming an record in the file of secondary memory.

  Operations on Files:

        1)  Write /OutputStream Operation
        2)  Read /InputStream Operation

Definition of Stream:
      The flow of data between primary memory and secondary memory is known as Stream.

Types of Streams:
   Based on transferring the data between primary and secondary memory, streams are classified into two types. They are

            1)  Byte Stream
            2)  Character Stream

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