Java Tutorial : Java IO (Java RandomAccessFile - V4) ~ foundjava

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Java Tutorial : Java IO (Java RandomAccessFile - V4) 

Java Tutorial : Java IO (Java RandomAccessFile - V4) 

Java Tutorial : Java IO (Java RandomAccessFile - V4) 

myfile.txt

John visits to india.

RandomAccessFileDemo.java

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.RandomAccessFile;

public class RandomAccessFileDemo
{
    public static void main(String[] args) throws IOException
    {
        RandomAccessFileDemo randomAccessFileDemo = new RandomAccessFileDemo();
        String str = randomAccessFileDemo.readFromFile("myfile.txt", 5);
        System.out.println(str);
        randomAccessFileDemo.writeToFile("myfile.txt", " and USA", 20);
    }

    private String readFromFile(String fileName, int position)
            throws FileNotFoundException, IOException
    {
        RandomAccessFile randomAccessFile = null;
        String str;
        try
        {

            randomAccessFile = new RandomAccessFile(fileName, "r");

            /*
             * Sets the file-pointer offset, measured from
             * the beginning of this file, at which the next
             * read or write occurs.
             */
            randomAccessFile.seek(position);

            str = randomAccessFile.readLine();
        }
        finally
        {
            if (randomAccessFile != null)
            {
                randomAccessFile.close();
            }
        }
        return str;
    }

    private void writeToFile(String fileName, String data, int position)
            throws IOException
    {
        {
            RandomAccessFile randomAccessFile = null;
            try
            {
                randomAccessFile = new RandomAccessFile(fileName, "rw");

                /*
                 * Sets the file-pointer offset, measured
                 * from the beginning of this file, at which
                 * the next read or write occurs.
                 */
                randomAccessFile.seek(position);
                randomAccessFile.writeBytes(data);
                System.out.println("Successfully written to the file.");
            }
            finally
            {
                if (randomAccessFile != null)
                {
                    randomAccessFile.close();
                }
            }
        }
    }
}

Output

visits to india.
Successfully written to the file.

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