FileReader
The FileReader class is used to read the data from a file as characters. It is recommended to use FileReader to read the data from text file. It extends the InputStreamReader class.FileReader Constructors
| Constructors | Description |
|---|---|
| FileReader( File file) | Creates a new FileReader and given the file to read from. |
| FileReader(FileDescriptor fd) | Creates a new file with FileDescriptor to read from. |
| FileReader(String filename) | Creates a new FileReader, given the name of the file to read from. |
Example: Implementing FileReader class to read the data from file.
import java.io.*;
public class FileReaderDemo
{
public static void main(String args[])throws FileNotFoundException, IOException
{
FileReader fr = new FileReader("abc.txt");
int i;
System.out.println("ASCII value of the character:");
while((i=fr.read()) != -1)
{
System.out.print(i+" : ");
System.out.println ((char)i);
}
}
}
Output:
ASCII value of the character:
65 : A
66 : B
67 : C
97 : a
98 : b
99 : c
FileWriter
The FileWriter class is used o write the data to a file as characters. It extends the OutputStreamWriter class.FileWriter Constructors
| Constructors | Description |
|---|---|
| FileWriter( File file) | It constructs a FileWriter object given a file object. |
| FileWriter(FileDescriptor fd) | It creates a FileWriter object with file descriptor. |
| FileWriter(String filename) | Creates a FileWriter object with specified file name. |
| FileWriter(File file, boolean append) | Creates a FileWriter object given by a file object. |
| FileWriter(String filename, boolean append) | Creates the FileWriter object given a file name. |
Example: Implementing FileWriter class to write the data on file.
import java.io.*;
public class FileWriterDemo
{
public static void main(String args[]) throws IOException
{
FileWriter fw = new FileWriter("abc.txt");
char c = 'a';
fw.write(c);
System.out.println("Character "+c+" is write in file");
fw.close();
}
}
Output:
Character a is write in file
