Character Stream I/O in Java

In a java programming, like a Byte stream Character stream is also used for input-output for 16 bit. But Byte streams are used to perform input and output of 8-bit.

Most common Character streams classes are, FileReader and FileWriter.

 FileReader- FileReader uses for reads two bytes at a time.

 FileWriter– FileWriter uses for writes two bytes at a time.

Example: Write a program, to copy the content of file A into file B using Byte stream class.

import java.io.*;
public class FileReaderExample {
    public static void main(String arg[]) throws IOException {
        FileReader I = null;
        FileWriter O = null;
        try {
            I = new FileReader("A.txt");
            O = new FileWriter("B.txt");
            int c;
            while ((c = I.read()) != -1) {
                O.write(c);
            }
        } finally {
            if (I != null) {
                I.close();
            }
            if (O != null) {
                O.close();
            }
        }
    }
}

Note: if there is only file A in which data is written and no file B then, file B will be create automatically.

Suppose we have a File “A”

Hello students I am aditya.

Output: When we run above program one new file create with Name “B” and content of file “A” will be copy into file “B”.

            File “B”

Hello students I am aditya.