This document discusses input and output streams in Java. It defines input streams as streams that receive or read data, and output streams as streams that send or write data. It classifies streams as byte streams, which transfer data as individual bytes and can be used for any file type, and text streams, which transfer data as characters and can only be used for text files. Examples of input and output streams are provided. The document also provides an example of using a FileOutputStream to write text to a file from the keyboard, and an example of using a FileInputStream to read text from that file.

1. Streams in Java
Input Stream
Output
Stream

2. Input Streams are streams which receive or read data
Output Streams are streams which send or write data
Always
keep in
mind
A stream carries data just as a water pipe carries water from
one place to another.

3. Another classification of streams is ‘byte streams’ & ‘text stream’.
Byte Stream->
• Data in the form of individual bytes.
• It can be used for any text,images,audio and video.
Examples::
FileInputStream
FileOutputStream
BufferedInputStream
Buffered0utputStream
Text Stream->
• Data as characters of each 2 bytes.
• It can be used only for text file.
Examples::
FileReader
FileWriter
BufferedReader
BufferedWriter
Note:- Stream is useful to move data from one place to another place, without Stream
it is not possible to move data in java.

4. Stream Example- Creating a file using FileOutputStream
Here we will write some text into Mytext.txt
• For writing the text from keyboard we can take any class such as
DataInputStream,BufferedReader,Scanner class,etc.
• FileOutputStream class will be used for writing that text into
Mytext.txt

5. import java.io.*;
public class Createfile
{
public static void main(String[] args)throws IOException
{
DataInputStream dis=new DataInputStream(System.in);
System.out.println(“Enter any String”);
String value=dis.readLine();
System.out.println("String which you have entered is "+value);
}
}
System.in is
representing
keyboard & it is
attached into
DataInputStream

6. Output of
previous
code

7. import java.io.*;
public class Createfile
{
public static void main(String[] args)throws IOException
{
DataInputStream dis=new DataInputStream(System.in);
FileOutputStream fout=new FileOutputStream("Mytext.txt");
System.out.println("Enter text (@ at the end):");
char ch;
while((ch=(char)dis.read())!='@')
{
fout.write(ch);
}
fout.close();
}
}
Myfile.txt file is attached into FileOutputStream object
In following example ,we can see how to write
text/string into a file.
This write method is used for
writing into file

8. Compile the class
Run the class
Writing the contents into file
Opening the file

9. Stream Example- Reading a file using FileInputStream
Here we will read String from Mytext.txt file-
• FileInputStream class will be used for reading string from Mytext.txt

10. import java.io.*;
class Readfile{
public static void main(String args[]) throws IOException
{
FileInputStream fin=new FileInputStream("Mytext.txt");
System.out.println("File contents are:: ");
int ch;
while((ch=fin.read())!=-1){
System.out.print((char)ch);
}
}
}
Myfile.txt file is attached into FileInputStream object
-1 indicate there is no content in
the file
…fin object has method read()
which will retrive content but
return information in integer
format
Converting integer information
into character.

11. Output

12. To be continue…………

13. Thanks For Watching…
-Java Foundation Technology