Binary translator server/client

import graphics.gui;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.*;

public class BinaryClient extends gui implements ActionListener
{
    private Socket client;
    private PrintWriter writer;
    private String text;

    public static void main(String[] args)throws IOException
    {
        gui.buildframe(310,360,"Client");
        gui.buildpane(300,300,true);
        gui.buildbutton(300,20,"Send");
        button.addActionListener(new BinaryClient());
    }

    @Override
    public void actionPerformed(ActionEvent e)
    {
        try
        {
        client=new Socket("localhost",63400);
        writer=new PrintWriter(client.getOutputStream(),true);
        text=message.getText();
        writer.println(text);
        message.setText("");
        }

        catch(IOException ex)
        {
            System.out.println("");
        }
    }
}





public class Libary extends BinaryServer{

    public static void translate()
    {
        if(Integer.parseInt(binary_letter)==1100001)
        {
            letter[i]="a";
        }
        if(Integer.parseInt(binary_letter)==1100010)
        {
            letter[i]="b";
        }
        if(Integer.parseInt(binary_letter)==1100011)
        {
            letter[i]="c";
        }
        if(Integer.parseInt(binary_letter)==1100100)
        {
            letter[i]="d";
        }
        if(Integer.parseInt(binary_letter)==1100101)
        {
            letter[i]="e";
        }
        if(Integer.parseInt(binary_letter)==1100110)
        {
            letter[i]="f";
        }
        if(Integer.parseInt(binary_letter)==1100111)
        {
            letter[i]="g";
        }
        if(Integer.parseInt(binary_letter)==1101000)
        {
            letter[i]="h";
        }
        if(Integer.parseInt(binary_letter)==1101001)
        {
            letter[i]="i";
        }
        if(Integer.parseInt(binary_letter)==1101010)
        {
            letter[i]="j";
        }
        if(Integer.parseInt(binary_letter)==1101011)
        {
            letter[i]="k";
        }
        if(Integer.parseInt(binary_letter)==1101100)
        {
            letter[i]="l";
        }
        if(Integer.parseInt(binary_letter)==1101101)
        {
            letter[i]="m";
        }
        if(Integer.parseInt(binary_letter)==1101110)
        {
            letter[i]="n";
        }
        if(Integer.parseInt(binary_letter)==1101111)
        {
            letter[i]="o";
        }
        if(Integer.parseInt(binary_letter)==1110000)
        {
            letter[i]="p";
        }
        if(Integer.parseInt(binary_letter)==1110001)
        {
            letter[i]="q";
        }
        if(Integer.parseInt(binary_letter)==1110010)
        {
            letter[i]="r";
        }
        if(Integer.parseInt(binary_letter)==1110011)
        {
            letter[i]="s";
        }
        if(Integer.parseInt(binary_letter)==1110100)
        {
            letter[i]="t";
        }
        if(Integer.parseInt(binary_letter)==1110101)
        {
            letter[i]="u";
        }
        if(Integer.parseInt(binary_letter)==1110110)
        {
            letter[i]="v";
        }
        if(Integer.parseInt(binary_letter)==1110111)
        {
            letter[i]="w";
        }
        if(Integer.parseInt(binary_letter)==1111000)
        {
            letter[i]="x";
        }
        if(Integer.parseInt(binary_letter)==1111001)
        {
            letter[i]="y";
        }
        if(Integer.parseInt(binary_letter)==1111010)
        {
            letter[i]="z";
        }
    }

    public static void encode()
    {
        if(letter[i].equals("a"))
        {
            binary[i]="01100001";
        }
        if(letter[i].equals("b"))
        {
            binary[i]="01100010";
        }
        if(letter[i].equals("c"))
        {
            binary[i]="01100011";
        }
        if(letter[i].equals("d"))
        {
            binary[i]="01100100";
        }
        if(letter[i].equals("e"))
        {
            binary[i]="01100101";
        }
        if(letter[i].equals("f"))
        {
            binary[i]="01100110";
        }
        if(letter[i].equals("g"))
        {
            binary[i]="01100111";
        }
        if(letter[i].equals("h"))
        {
            binary[i]="01101000";
        }
        if(letter[i].equals("i"))
        {
            binary[i]="01101001";
        }
        if(letter[i].equals("j"))
        {
            binary[i]="01101010";
        }
        if(letter[i].equals("k"))
        {
            binary[i]="01101011";
        }
        if(letter[i].equals("l"))
        {
            binary[i]="01101101";
        }
        if(letter[i].equals("m"))
        {
            binary[i]="01101101";
        }
        if(letter[i].equals("n"))
        {
            binary[i]="01101110";
        }
        if(letter[i].equals("o"))
        {
            binary[i]="01101111";
        }
        if(letter[i].equals("p"))
        {
            binary[i]="01110000";
        }
        if(letter[i].equals("q"))
        {
            binary[i]="01110001";
        }
        if(letter[i].equals("r"))
        {
            binary[i]="01110010";
        }
        if(letter[i].equals("s"))
        {
            binary[i]="01110011";
        }
        if(letter[i].equals("t"))
        {
            binary[i]="01110100";
        }
        if(letter[i].equals("u"))
        {
            binary[i]="01110101";
        }
        if(letter[i].equals("v"))
        {
            binary[i]="01110110";
        }
        if(letter[i].equals("w"))
        {
            binary[i]="01110111";
        }
        if(letter[i].equals("x"))
        {
            binary[i]="01111000";
        }
        if(letter[i].equals("y"))
        {
            binary[i]="01111001";
        }
        if(letter[i].equals("z"))
        {
            binary[i]="01111010";
        }
    }
}


import java.net.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.*;
import graphics.gui;

public class BinaryServer extends gui implements ActionListener
{
    private ServerSocket server;
    private Socket client;
    private String text;
    private BufferedReader reader;

    public static String binary_letter;
    public static String[] letter;
    public static int i;
    public static String[] binary;


    public static void main(String[] args)throws IOException
    {
       BinaryServer instance=new BinaryServer();
       gui.buildframe(310,360,"Binary translator server");
       gui.buildpane(300,300,true);
       gui.buildbutton(300,20,"Translate");
       instance.server(63400);
    }

    public void server(int port)throws IOException
    {
        server=new ServerSocket(port);
        button.addActionListener(this);

        while(true)
        {
            client=server.accept();
            reader=new BufferedReader(new InputStreamReader(client.getInputStream()));
            text=reader.readLine();
            message.setText(message.getText()+"\n"+text+": ");
        }
    }

    @Override
    public void actionPerformed(ActionEvent e)
    {
        if(text.contains("0"))
        {
            int length=text.length();
            letter=new String[length+1];
            int begin=-8;
            int end=0;

            for(i=1;i<=length/8;i++)
            {
                begin=begin+8;
                end=i*8;
                binary_letter=text.substring(begin,end);
                Libary.translate();
                message.setText(message.getText()+letter[i]);
            }
        }
        else
        {
            int length=text.length();
            letter=new String[length+1];
            binary=new String[length+1];

            for(i=1;i<=length;i++)
            {
                letter[i]=text.substring(i-1,i);
                Libary.encode();
                message.setText(message.getText()+binary[i]);
            }
        }
    }
}