OS Lab 1.1

import java.io.File;
import java.io.FilenameFilter;

public class HW01_1 {
public static void main(String [] args) {
    if(args.length==0) {
        System.out.println("Ne e vneseno nishto");
        return;
    }
    File directory=new File(args[0]);
    if(!directory.exists()) {
        System.out.print("Ne postoi takov fajl");
    return;
    }
    if(!directory.isDirectory()) {
        System.out.print("Fajlot so toa ime ne e directory");
        return;
    }
    File [] files=directory.listFiles(new FilenameFilter(){

        @Override
        public boolean accept(File a,String name) {
            return name.endsWith(".txt");

        }

    });
    int zbir=0;
    for(File f:files)
        zbir+=f.length();
    double prosek=((double)zbir)/files.length;
    System.out.println("Vkupnata golemina na fajlovite e:"+ zbir+" a prosekot e: "+ prosek+"bajti");
}
}