//package Lab1_HW01_1;

import java.io.File;

public class HW01_1 {

	public static void main(String[] args) {
		File f=new File(".");
		File niza[]=f.listFiles();
		double S=0;
		int br=0;
		for(File f1: niza) {
			if(f1.getAbsolutePath().endsWith(".txt"))
				S+=f1.length();
				br++;
		}
		System.out.println(String.format("%.2f",(float)S/1024)+"kb");
		System.out.println(br);
	}

}

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//package Test;

import java.awt.Desktop;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.util.Scanner;

public class HW01_2 {

	public static void main(String[] args) throws IOException {
	        File f= new File("izvor.txt");
	        RandomAccessFile f1 = new RandomAccessFile(f,"rw");
	        RandomAccessFile f2 = new RandomAccessFile(new File("destinacija.txt"),"rw");
	        if(f.exists())
	        {
	            for(long i=f1.length()-1;i>=0;i--)
	            {
		             f1.seek(i);
		             f2.write(f1.read());
	            }
	            f1.close();
	            f2.close();
	        }else
	        	System.out.println("Fajlot: "+f.getName()+" ne postoi");
	}
}




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import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;

public class HW01_3 {
	public static void main(String[]args) throws IOException{
		BufferedReader reader=null;
		BufferedWriter writer=null;
		try{
			File f=new File("izvor.txt");
			reader=new BufferedReader(new FileReader(f));
			writer=new BufferedWriter(new FileWriter(new File("destinacija.txt")));
			StringBuilder sb=new StringBuilder();
			String s=null;
			while((s=reader.readLine())!=null){
				sb.append(s);
			}
			writer.write(sb.reverse().toString());
			writer.flush();
		}catch(IOException e){
			e.printStackTrace();
		}finally{
			reader.close();
			writer.flush();
			writer.close();
		}
	}
}

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//package Test;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
public class HW01_4 {
	public static void main(String[]args) throws IOException{
		BufferedReader reader=null;
		BufferedWriter writer=null;
		try{
			File f=new File("rezultati.csv");
			reader=new BufferedReader(new FileReader(f));
			writer=new BufferedWriter(new FileWriter(new File("destinacija.tsv")));
			String s=null;
			int sum=0;
			while((s=reader.readLine())!=null){
				String[]parts=null;
				sum=0;
				for(int i=1;i<parts.length;i++){
					sum+=Integer.parseInt(parts[i]);
					if(i!=parts.length-1)
					writer.write(parts[i]+"\t");
					else
						writer.write(parts[i]);
				}
				System.out.println(parts[0]+" : "+(float)sum/(parts.length-1));
				writer.write(System.lineSeparator());
			}

		}catch(IOException e){
			e.printStackTrace();
		}finally{
			reader.close();
			writer.flush();
			writer.close();
		}
	}
}




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import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.UnknownHostException;

class TCPClient{
	public static void main(String[] args) throws IOException {
			Socket clientSocket=null;
		try {
			clientSocket=new Socket("localhost",9876);
			DataOutputStream outToServer=new DataOutputStream(clientSocket.getOutputStream());
			outToServer.writeDouble(1.25);
			outToServer.writeLong(123584124);
			outToServer.writeBoolean(true);
			outToServer.writeUTF("UTF String");
			outToServer.flush();
		} catch (UnknownHostException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}finally {
			clientSocket.close();
		}

	}
}
 class TCPServer {

	public static void main(String[] args) throws IOException{
		ServerSocket serversocket1=null;
		try {
			while(true)
			{
				serversocket1=new ServerSocket(9876);
				Socket consocket=serversocket1.accept();
				DataInputStream mes=new DataInputStream(consocket.getInputStream());
				System.out.println(mes.readDouble());
				System.out.println(mes.readLong());
				System.out.println(mes.readBoolean());
				System.out.println(mes.readUTF());
				consocket.close();
				serversocket1.close();

			}
		} catch (IOException e) {
			e.printStackTrace();
		}

	}

}