C_cipher

import javax.swing.*;
import java.util.Scanner;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.lang.String;
public class Cipher {
    static String tmp = "";
    public static void main(String[] args) {
        JFrame f = new JFrame();
        f.setLayout(new GridLayout(4, 1));
        JTextField txt = new JTextField();
        JTextField txt2 = new JTextField();
        JLabel lbl = new JLabel();
        JLabel lbl2 = new JLabel();
        JButton btn = new JButton("Submit");
        f.add(txt);
        f.add(txt2);
        f.add(lbl);
        f.add(lbl2);
        f.add(btn);

        btn.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent arg0) {
                // TODO Auto-generated method stub
                char[] alp = txt.getText().toCharArray();
                int len = Integer.parseInt(txt2.getText());
                for(int i = 0; i < alp.length; i++) {
                    alp[i] = (char)((int)alp[i] + len);
                    tmp = tmp + alp[i];
                }
                lbl.setText(tmp);
                //''''''''''''''''''''''''''''''''''''''''''''''''''''//
                tmp = "";
                char[] dec = lbl.getText().toCharArray();
                for(int i = 0; i < dec.length; i++) {
                    dec[i] = (char)((int)dec[i] - len);
                    tmp = tmp + dec[i];
                }
                lbl2.setText(tmp);
            }
        });
        f.setVisible(true);
    }
}