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Get File size in bytes

  1. /*
  2.   Get File size in bytes
  3.   This Java example shows how to get the size of a particular file in bytes,
  4.   KB and MB using length method of Java File class.
  5. */
  6.  
  7. import java.io.*;
  8.  
  9. public class GetFileSizeInByetes {
  10.  
  11.   public static void main(String[] args) {
  12.    
  13.     //create file object
  14.     File file = new File("C://FileIO/demo.txt");
  15.    
  16.     /*
  17.      * To get the size of a file, use
  18.      * long length() method of Java File class.
  19.      *
  20.      * This method returns size of a particular file in bytes. It returns 0L
  21.      * if file does not exists, and unspecified if file is a directory.
  22.      *
  23.      */
  24.    
  25.      long fileSize = file.length();
  26.    
  27.      System.out.println("File size in bytes is: " + fileSize);
  28.      System.out.println("File size in KB is : " + (double)fileSize/1024);
  29.      System.out.println("File size in MB is :" + (double)fileSize/(1024*1024));
  30.   }
  31. }
  32.  
  33. /*
  34. Output would be
  35. File size in bytes is: 492480
  36. File size in KB is : 480.9375
  37. File size in MB is :0.46966552734375
  38. */