1. FILE HANDLING

2. CONTENTS
Introduction
 Concept Of Streams
 Stream Classes
 Types Of Stream Classes
 Reading and Writing Characters
 Reading and Writing Bytes
 Handling Primitive Data Types
 Concatenating & Buffering Files
 Random Access Files
 Interactive I/O


3. INTRODUCTION

File is a collection of bytes stored in secondary storage
device i.e. disk.

File handling is used to read, write, append or update a
file without directly opening it.

Storing and managing data using files is known as File
Processing.

4. CONCEPT OF STREAMS

5. STREAM CLASSES
 java.io
package contain large no of stream
classes.
 It
provide capability to process all type of data

6. CLASSIFICATION OF STREAM CLASSES

7. 1.BYTE STREAM CLASSES

It provide features for creating and manipulating streams
and files for reading and writing bytes.

It has 2 classes:
InputStream Classes
 OutputStream Classes


8. A.INPUTSTREAM
CLASSES

9. METHODS OF INPUTSTREAM

public void read()


public void read(byte b[])


Reads a single byte from input stream.
Reads an array of bytes.
public void close

Close input stream.

10. B.OUTPUTSTREAM CLASSES

11. METHODS OF OUTPUTSTREAM

public void write()


public void write(byte b[])


Write all bytes in an array.
public void flush()


Write single byte to an output stream.
Flushes the output stream.
public void write(byte b[], int n, int m)

Write m bytes from array b starting from nth byte.

12. 2.CHARACTER STREAM CLASSES

It can be used to read and write character.

It has 2 classes:
Reader Streams Classes
 Writer Streams Classes


13. READING /WRITING CHARACTERS

It provide a way to:
Read characters from a file.
 Write characters to any file.


Methods used:
FileReader
 FileWriter

Program cpy1.java

14. READING /WRITING BYTES

It allow us to
Read bytes from files
 Write bytes to file.


Methods used:
FileInputStream
 FileOutputStream

Program cpy1_byte.java
Program cpy2_byte.java
Program read_byte.java

15. HANDLING PRIMITIVE TYPES

Its used to add primitive data into file

Following methods used:
writeInt
 writeDouble
 WriteBoolean

Program cpy3_prim.java

16. CONCATENATION & BUFFERING FILES
Concatenation
 To combine 2 or more input files into 1 input file.
 It’s achieved using:

SequenceInputStream
Buffering
 To store temporarily data i.e read/write to a file.
 It’s created using:

BufferedInputStream
program sb.java

17. RANDOM ACCESS FILES

It allow us to create a file that can be used for reading &
writing data with random access.

It has 2 mode strings
“r” for reading only
 “rw” for both reading & writing

Program randomIO.java
Program rand.java

18. INTERACTIVE I/O

It’s process of reading data from keyboard & displaying
output on screen.

Two types of interactive i/o:
Simple interactive i/o
 Graphical interactive i/o

Program aj.java

19. THANK
YOU