Java.io.RandomAccessFile.length() Method


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Description

The java.io.RandomAccessFile.length() method returns the length of this file.

Declaration

Following is the declaration for java.io.RandomAccessFile.length() method.

public long length()

Parameters

NA

Return Value

This method returns the length of this file, measured in bytes.

Exception

IOException − If an I/O error occurs.

Example

The following example shows the usage of java.io.RandomAccessFile.length() method.

package com.tutorialspoint;

import java.io.*;

public class RandomAccessFileDemo {

   public static void main(String[] args) {
   
      try {
      
         // create a new RandomAccessFile with filename test
         RandomAccessFile raf = new RandomAccessFile("c:/test.txt", "rw");

         // write something in the file
         raf.writeUTF("Hello World");

         // set the file pointer at 0 position
         raf.seek(0);

         // read and print the contents of the file
         System.out.println("" + raf.readUTF());

         // print the length of the file
         System.out.println("" + raf.length());

         // write something more in the file
         raf.writeUTF("This is an example");

         // print the length of the file
         System.out.println("" + raf.length());
         
      } catch (IOException ex) {
         ex.printStackTrace();
      }
   }
}

Assuming we have a text file c:/test.txt, which has the following content. This file will be used as an input for our example program −

ABCDE  

Let us compile and run the above program, this will produce the following result −

Hello World
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java_io_randomaccessfile.htm

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