This document provides an overview of file handling in Java. It discusses key concepts like streams and stream classes for reading and writing different data types to files. The main stream classes covered are byte streams for reading/writing bytes and character streams for reading/writing characters. It also describes techniques for concatenating and buffering files, performing random access on files, and handling interactive input/output.

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