Java tutorial
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); } }