JAVA I/O

/*
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 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package iokol2016;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileFilter;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.FilenameFilter;
import java.io.IOException;
import java.io.RandomAccessFile;

/**
 *
 * @author jimmy
 */
public class IOkol2016 {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) throws IOException {
        // TODO code application logic here
        //zapisaj("text.txt","napocetok.txt");
        //zapisajSoBuff("text.txt","sobuf.txt");
        //napocetok("text.txt","odpocetok.txt");
        //napocetok("text1.txt","odpocetok.txt");
        ///javatxt("odpocetok.txt","java.txt");
        filter(".");
    }
    public static void zapisaj(String in , String out) throws FileNotFoundException, IOException{

        File in1=new File(in);
        File out1=new File(out);

        RandomAccessFile r=new RandomAccessFile(in1,"r");
        RandomAccessFile rw=new RandomAccessFile(out1,"rw");
        try{

            int kraj=(int) r.length();
            int poc=0;
            byte[] bajt = new byte[kraj];
            int c;
            rw.seek(rw.length());

            while((c=r.read(bajt))!=-1){

                rw.write(bajt,0,kraj);
            }




        }finally{
            if(rw!=null){

                rw.close();
            }
            if(r!=null){
                r.close();
            }


        }

    }
    public static void zapisajSoBuff(String in, String out) throws FileNotFoundException, IOException{

        File in1 = new File(in);
        File out1=new File(out);

        FileReader fr = new FileReader(in1);
        BufferedReader br=new BufferedReader(fr);
        FileWriter fw=new FileWriter(out1,true);
        BufferedWriter bw = new BufferedWriter(fw);

        try{

            String s;

            while((s=br.readLine())!=null){

                bw.write(s);
            }


        }finally{

            if(bw!=null){
                bw.close();
            }
            if(br!=null){
                br.close();
            }

        }
    }
    public static void napocetok(String in ,String out) throws FileNotFoundException, IOException{


        File in1 = new File(in);
        File out1=new File(out);

        RandomAccessFile r=null;
        RandomAccessFile rw=null;
        try{

           r=new RandomAccessFile(in,"r");
           rw=new RandomAccessFile(out,"rw");

           rw.seek(rw.length());
           int kraj=(int) r.length();
           byte[] bajt=new byte[kraj];
           int c;
           while((c=r.read(bajt))!=-1){

               rw.write(bajt,0,kraj);

           }



        }finally{
            if(r!=null){

                r.close();
            }
            if(rw!=null){
                rw.close();
            }
        }







    }
    public static void javatxt(String in , String out) throws FileNotFoundException, IOException{
        RandomAccessFile r=null;
        RandomAccessFile rw=null;
        try{

           r=new RandomAccessFile(in,"r");
           rw=new RandomAccessFile(out,"rw");

           //rw.seek(rw.length());
           int kraj=(int) r.length();
           byte[] bajt=new byte[kraj];
           int c;
           while((c=r.read(bajt))!=-1){

               rw.write(bajt,0,kraj);

           }



        }finally{
            if(r!=null){

                r.close();
            }
            if(rw!=null){
                rw.close();
            }
        }

    }
    public static void filter(String in){


        FileFilter file = new FileFilter() {
            @Override
            public boolean accept(File pathname) {
                //throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.

                return pathname.isFile() && pathname.getName().endsWith(".dat");
            }
        };
        FilenameFilter name = new FilenameFilter(){
            @Override
            public boolean accept(File dir, String name) {
                //throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
                String ime = name.toLowerCase();
                if(ime.endsWith(".txt")){
                    return true;
                }
                else
                    return false;

            }


        };

        File f = new File(in);

        for(File f1 : f.listFiles(file)){

            System.out.println(f1.getName());
        }

        for(File f1 : f.listFiles(name)){
            if(f1.isFile()){

                System.out.println(f1.getName() + " " +f1.getAbsolutePath());
            }
            }
    }

}