Vernam Cipher in JAVA Frame

Hey Guys ! 
Today I would like to post the Java code for Vernam Cipher.

To Run:

Open Command Prompt.
Navigate to current location of file.
Compile java file using javac. [ javac Vernam.java ]
Run the java file .[ java Vernam ] 

Vernam.java

import java.awt.*;

import java.io.*;

import java.net.*;

import java.util.*;

import java.awt.event.*;

public class Vernam extends Frame implements ActionListener

{

TextField fl,pad;

Button otp,op,br,en,de;

TextArea pt,ct;

Vernam()

{

setBackground(Color.decode("#eeccff"));

setLayout(null);

fl=new TextField(30);

add(fl);

fl.setBounds(60,90,520,30);

br=new Button("Browse");

add(br);

op=new Button("Open");

op.setBounds(800,90,180,30);

add(op);

br.setBounds(600,90,180,30);

en=new Button("Encrypt >>");

add(en);

en.setBounds(430,180,80,30);

de=new Button("<< Decrypt");

add(de);

otp=new Button("Generate OTP");

add(otp);

otp.setBounds(430,380,80,30);

de.setBounds(430,280,80,30);

pad=new TextField(30);

add(pad);

pad.setBounds(430,420,80,30);

pt=new TextArea();

add(pt);

pt.setBounds(60,140,350,350);

ct=new TextArea("text",100,30,TextArea.SCROLLBARS_VERTICAL_ONLY);

add(ct);

ct.setBounds(550,140,350,350);

br.addActionListener(this);

op.addActionListener(this);

en.addActionListener(this);

de.addActionListener(this);

otp.addActionListener(this);

addWindowListener(new WindowAdapter()

{

public void windowClosing(WindowEvent we)

 {

  setVisible(false);

  System.exit(0);

 }

});

}

public void actionPerformed(ActionEvent ae)

{

if(ae.getSource().equals(br))

{

try

{

FileDialog fd=new FileDialog(this,"Select File to Encrypt",FileDialog.LOAD);

fd.show();

String filename=fd.getDirectory()+fd.getFile();

if(!filename.equals("nullnull"))

fl.setText(filename);

}

catch(Exception e)

{

System.out.println("Error in opening file");

}

}

else if(ae.getSource().equals(op))

{

try

{

String filename=fl.getText();

FileInputStream fis=new FileInputStream(filename);

DataInputStream dis=new DataInputStream(fis);

                String str;

                while((str=dis.readLine())!=null)

                {

                   

pt.append(str+"\n");

  }

                dis.close();

}

catch(Exception e)

{

}

}

else if(ae.getSource().equals(en))

{

String plaintext=pt.getText();

String key=pad.getText();

int len=plaintext.length();

char[] cipher=new char[len];

for(int i=0;i<len;i++)

{

char p=plaintext.charAt(i);

if(p!=' '&&p!='.'&&p!='\n')

{

if((int)p >=97)

p-=97;

else if((int) p >=65)

p-=65;

else

p-=48;

char k=key.charAt(i%key.length());

if((int)k >=97)

k-=97;

else if((int) k >=65)

k-=65;

else

k-=48;

int res=(int)p+(int)k;

while(res>=26)

res-=26;

res+=97;

cipher[i]=(char)res;

}

else

cipher[i]=p;

}

ct.setText(new String(cipher));

}

else if(ae.getSource().equals(de))

{

String ciphertext=ct.getText();

String key=pad.getText();

int len=ciphertext.length();

char[] plain=new char[len];

for(int i=0;i<len;i++)

{

char c=ciphertext.charAt(i);

if(c!=' '&&c!='.'&&c!='\n')

{

if((int)c >=97)

c-=97;

else if((int) c >=65)

c-=65;

else

c-=48;

char k=key.charAt(i%key.length());

if((int)k >=97)

k-=97;

else if((int) k >=65)

k-=65;

else

k-=48;

int res=(int)c-(int)k;

while(res<0)

res+=26;

res+=97;

plain[i]=(char)res;

}

else

plain[i]=c;

}

pt.setText(new String(plain));

}

else

{

String str="abcdefghijklmnopqrstuvwxyz";

Random newran=new Random();

char[] OTP=new char[6];

for(int i=0;i<6;i++)

OTP[i]=str.charAt(newran.nextInt(str.length()));

pad.setText(new String(OTP));

}

}

public static void main(String args[])

{

Vernam v=new Vernam();

v.setSize(1000,600);

v.setVisible(true);

}

}