public class PrvKolokvium_Grupa2 {
    public void copyLargeTxtFiles(String from, String to, long size) throws IOException{
        File f = new File(from);
        File t = new File(to);

        if(!f.exists()){
            System.out.println("Ne postoi");
            return;
        }
        if(!t.exists()){
            t.mkdirs();
        }

        File[] files = f.listFiles();
        for (File file : files) {
            if(file.getName().endsWith(".txt") && file.length() > size){
                FileInputStream fis = null;
                FileOutputStream fos = null;

                try {
                    fis = new FileInputStream(file);
                    File newFile = new File(to, file.getName());
                    fos = new FileOutputStream(newFile);
                    int b;
                    while((b = fis.read()) == -1){
                        fos.write(b);
                    }

                } catch (Exception e) {
                    // TODO: handle exception
                }finally{
                    if(fis != null){
                        fis.close();
                    }
                    if(fos != null){
                        fos.flush();
                        fos.close();
                    }
                }
            }
        }
    }