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import java.awt.Color;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.BorderFactory;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JTextField;

import javax.swing.UIManager;

import javax.swing.event.CaretEvent;

import javax.swing.event.CaretListener;

public class BitChanger {

public static void main(String[] args) {

try{UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());}catch(Exception e){}

String s="HELLO";

System.out.println(s);

System.out.println(toBinaryString(s));

System.out.println(toHexString(s));

System.out.println(changeBit(toBinaryString(s),12));

System.out.println(toNormalString(changeBit(toBinaryString(s),12)));

System.out.println(toHexString(toNormalString(changeBit(toBinaryString(s),12))));

JFrame f=new JFrame("Bit changer v1.0");

f.setSize(433,230);

f.setDefaultCloseOperation(3);

f.getContentPane().setLayout(null);

JLabel l1=new JLabel("Enter a string:");

final JTextField input=new JTextField(20);

final JLabel binary=new JLabel();

final JLabel hex=new JLabel();

JLabel l2=new JLabel("Enter the Bit number to flip:");

final JTextField flip=new JTextField(5);

JButton change=new JButton("Change
Bit");

JButton exit=new JButton("Exit");

l1.setBounds(10,10,100,25);

input.setBounds(110,10,100,25);

binary.setBounds(10,45,400,25);

hex.setBounds(10,80,400,25);

l2.setBounds(10,115,208,25);

flip.setBounds(220,115,40,25);

change.setBounds(270,115,68,45);

exit.setBounds(123,150,60,30);

f.add(l1);

f.add(l2);

f.add(input);

f.add(binary);

f.add(hex);

f.add(flip);

f.add(change);

f.add(exit);

f.setVisible(true);

binary.setBorder(BorderFactory.createLineBorder(Color.blue));

hex.setBorder(BorderFactory.createLineBorder(Color.red));

input.addCaretListener(new CaretListener(){

public void caretUpdate(CaretEvent e) {

binary.setText(toBinaryString(input.getText()));

hex.setText(toHexString(input.getText()));

}});

change.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e) {

try{

int id=Integer.parseInt(flip.getText().trim());

input.setText(toNormalString(changeBit(toBinaryString(input.getText()),id)));

}catch(Exception ex){}

}});

exit.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e) {

System.exit(-1);

}});

}

private static String toNormalString(String binary){

String[] sp=binary.split(" ");

String v="";

for(int i=0; i

v+=(char)Integer.valueOf(sp[i],2).intValue();

}

return v;

}

private static String changeBit(String s,int bi){

if(s.isEmpty())return s;

int cid=bi/8;

int bid=bi%8;

char ch=s.charAt(cid*9+bid-1);

ch=ch=='0'?'1':'0';

s=s.substring(0,cid*9+bid-1)+ch+s.substring(cid*9+bid);

return s;

}

private static String toBinaryString(String s) {

if(s.isEmpty())return s;

String v="";

for(int i=0; i

String bs=Integer.toBinaryString(s.charAt(i));

while(bs.length()<8)

bs='0'+bs;

v+=bs+" ";

}

return v;

}

private static String toHexString(String s){

if(s.isEmpty())return s;

String v="";

for(int i=0; i

String bs=Integer.toHexString(s.charAt(i));

v+=" "+bs.toUpperCase()+" ";

}

return v;

}

}

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