FileReader

FileReader class is a subclass of Reader abstract class and it is used to read a character/characters from a local file.

Constructor :

FileReader(File file)
This constructor creates a FileReader object to read out the contents of a file referenced by a File object. Example-: `File file = new File("D:\\Textbook.txt"); FileReader fr = new FileReader(file);`

Methods for reading FileReader

Some methods that we generally use while working with FileReader are shown in the table below :

Methods	Description
available()	This method gives the remaining number of bytes available to read from this input stream.
read()	This method reads one character at a time from this input character stream.
read(char[])	This method reads a whole character array at a time from this input character stream.
close()	This method closes this input stream and also frees any resources connected with this input stream.

Reading one character a time from a file using FileReader class.

We are reading an existing file called TextBook.txt using its path D:\\TextBook.txt. Let's say the contents of this file are -
Hello there!
FileReader class is a subclass of Reader class.

import java.io.*;
class A
{
public static void main(String... ar)
{

try
{
File file= new File("D:\\TextBook.txt");
FileReader fr= new FileReader(file);
int c;

//Reading one character a time from a file until -1 is returned
while( (c=fr.read())!=-1)
{
System.out.print((char)c);
}

fr.close();
}
catch(IOException e)
{
System.out.println(e);
}

}
}

Output is -:

Hello there!
FileReader class is a subclass of Reader class.

Program Analysis

We are reading characters out of a local file(referenced a File object), using FileReader class.
FileReader's read() method reads one character a time out of the file, until -1 is returned.
Finally the open reader character stream is closed by close() method to free any connected resources.

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