Java tutorial
//package com.java2s; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; public class Main { public static long getFileSizes(File f) { FileInputStream fis = null; try { fis = new FileInputStream(f); return fis.available(); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } finally { try { if (fis != null) fis.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } return -1; } }