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Using a Random Access File in Java
Posted on: April 17, 2007 at 12:00 AM

In this section, you will learn the Random Access File features provided by java io package.
C:\nisha>javac RandAccessFile.java

C:\nisha>java RandAccessFile
Enter File name : Filterfile.txt
Write Successfully

Download this example.

The another program reads the characters from a file using the readByte( ) method.


import java.io.*;



public class ReadAccessFile{

  public static void main(String[] args) throws IOException{

  BufferedReader in = new BufferedReader(new InputStreamReader(System.in));

  System.out.print("Enter File name : ");

  String str = in.readLine();

  File file = new File(str);

  if(!file.exists())

  {

  System.out.println("File does not exist.");

  System.exit(0);

  }

  try{

  //Open the file for both reading and writing

  RandomAccessFile rand = new RandomAccessFile(file,"r"); 

  int i=(int)rand.length();

  System.out.println("Length: " + i);

 rand.seek(0);  //Seek to start point of file

  for(int ct = 0; ct < i; ct++){

  byte b = rand.readByte();
    //read byte from the file

  System.out.print((char)b); //convert
    byte into char

  }

  rand.close();

  }

  catch(IOException e)

  {

  System.out.println(e.getMessage());

  }

  }

}

Output of the Program:

C:\nisha>java ReadAccessFile
Enter File name : Filterfile.txt
Length: 30
??t h i s i s a f i l e
C:\nisha>

Download this Program:

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