Get file size in Java

//  w w w  .j  av  a  2  s  .  co m
import java.io.File;

public class Main {

  public static long getFileSize(String filename) {
    File file = new File(filename);

    if (!file.exists() || !file.isFile()) {
      System.out.println("File doesn\'t exist");
      return -1;
    }
    return file.length();
  }

  public static void main(String[] args) {
    long size = getFileSize("c:/my.txt");
    System.out.println("Filesize in bytes: " + size);
  }
}