Here is the step by step procedure to change the physical address of your windows system

1. Go to Start->Settings->Control Panel and double click on Network and Dial-up Connections.
2. Right click on the NIC you want to change the MAC address and click on properties.
3. Under “General” tab, click on the “Configure” button
4. Click on “Advanced” tab
5. Under “Property section”, you should see an item called “Network Address” or “Locally Administered Address”, click on it.
6.On the right side, under “Value”, type in the New MAC address you want to assign to your NIC. Usually this value is entered without the “-“ between the MAC address numbers.
7. Goto command prompt and type in “ipconfig /all” or “net config rdr” to verify the changes. If the changes are not materialized, then use the second method.
8. If successful, reboot your system.

It does not actually requires programming. All you need to do is call the appropriate API, that will do the job for you. The followin code will help you to convert a date from one format to another

CODE

String reverseDate(String date)
{// date is of the format yyyy-mm-dd
java.text.DateFormat dfYMD =
new java.text.SimpleDateFormat(“yyyy-MM-dd”) ;
java.text.DateFormat dfDMY =
new java.text.SimpleDateFormat(“dd-MM-yyyy”) ;
try
{
return dfDMY.format(dfYMD.parse(date)) ;

}
catch (Exception e)
{
e.printStackTrace();
return “00-00-0000″;
}
}

we all know what are 2D arrays, they are just array of arrays, Here is a simple code which can help you if u are interseted in navigating through the 2D array in search of some keyword or string. The following is the function which will ease your job

public MatCell contains(String search, String[][] searchtable,int row,int cell)
{
boolean found = false;
boolean searchrow = true;
int cellcounter = 0;
int cellcount =0;
try
{
cellcount = searchtable[0].length;

}
catch (ArrayIndexOutOfBoundsException e)
{
// if the array is not initialised
cellcount = 0;
System.out.println(“Array not initialised”);
}

//        int row = 0;
//        int cell = 0;
int ROWDIM=searchtable.length-1;

int[] cellhit = new int[ROWDIM];

while(!found)
{
MatCell mat=new MatCell();
while(searchrow)
{
if(cellcount == cell)
{
cell = 0;
searchrow = false;
}
else
{
//System.out.println(“Array value:”+searchtable[row][cell]);
if(searchtable[row][cell]!=null)
{
if((searchtable[row][cell]).toLowerCase().contains(search.toLowerCase()))
{
mat.row=row;
mat.col=cell;

//    System.out.println(“Found “+searchtable[row][cell]);
found = true;
return(mat);
}
}
cell++;
}
}
row++;
searchrow = true;
if(row==ROWDIM)
{
System.out.println(“Search not found.”);
found = true;    // return true value to break the loop;
}
}
return null;
}

CLASS MATCELL

class MatCell
{
int row=0;
int col=0;
};

Hi guys, If you are looking for a search and replace program like the one provided by MS Office, Dreamweaver, and every other High end application, then you have come to the right place. The following code will help you to search a particular string or a word in a JTable.

If you are developing something like a spreadsheet or excel sheet in java, then this will surely help you in searching those big documents, or 2D arrays.

You can customize it for search and replace as well.

CODE

import javax.swing.*;
import javax.swing.table.*;

import java.awt.*;
import java.awt.event.*;
import java.awt.print.*;
import java.text.*;
import javax.swing.BorderFactory;
import javax.swing.border.Border;
import java.util.Calendar;

import javax.swing.table.*;
import java.awt.*;
import java.awt.print.*;
import java.awt.geom.*;
import java.text.MessageFormat;
import java.awt.event.*;
import java.awt.*;
import javax.swing.*;
import javax.swing.table.*;
import java.awt.print.*;
import java.io.*;

class MatCell
{
int row=0;
int col=0;
};

public class TablePrint
{
//Printable tp;

static String ovr=”";

int drow,arow;

TableColumn cl;
static void printFrame(Object rs[][],Object hd[],String m)
{

final String mm=m;
final Object rows[][]=rs;

final Object headers[] = hd;
Runnable runner = new Runnable() {

public void run() {
final JFrame frame = new JFrame(“Convergence Printing. www.convergenceservices.in”);
DefaultTableModel model = new DefaultTableModel(rows,headers);

final JTable table = new JTable( model )
{
//  Returning the Class of each column will allow different
//  renderers to be used based on Class
public Class getColumnClass(int column)
{

return getValueAt(0, column).getClass();
}

};
table.setPreferredScrollableViewportSize(table.getPreferredSize());

table.setShowGrid(false);

table.setSize(620,500);

table.setShowHorizontalLines(false);
table.setShowVerticalLines(false);
table.setAutoResizeMode(JTable.AUTO_RESIZE_SUBSEQUENT_COLUMNS);

if(mm.equalsIgnoreCase(“1″))    // for receipts
{

final JTextField search=new JTextField(10);
JPanel p=new JPanel();
JButton button1 = new JButton(“Find next”);
ActionListener findAction = new ActionListener() {
int startrow=0;
int startcol=0;

public void actionPerformed(ActionEvent e)
{
String mat[][]=getStringArray(table);

/*    for (int i=0;i<mat.length ;i++ )
{
for (int j=0;j<mat[0].length ;j++ )
{
System.out.print(“\t”+mat[i][j]);
}
System.out.println();
}
*/        String    key = search.getText();
MatCell m= contains (key, mat, startrow,startcol);

if (m!=null)
{
search.setBackground(Color.white);

startrow=m.row;
startcol=m.col;
System.out.println(“Row=”+startrow);
System.out.println(“Col=”+startcol);

boolean toggle = false;
boolean extend = false;
table.changeSelection(startrow, startcol, toggle, extend);
//        startrow+=(m.row+1)%mat[0].length;
startcol=(m.col+1)%mat[0].length;
if (startcol==0)
{
startrow++;
}

System.out.println(” New Row=”+startrow);
System.out.println(” New Col=”+startcol);
}
else
{
startrow=0;
startcol=0;
table.clearSelection();
search.setBackground(Color.red);
Toolkit.getDefaultToolkit().beep();
}

//If a string was returned, say so.
}
public MatCell contains(String search, String[][] searchtable,int row,int cell)
{
boolean found = false;
boolean searchrow = true;
int cellcounter = 0;
int cellcount =0;
try
{
cellcount = searchtable[0].length;

}
catch (ArrayIndexOutOfBoundsException e)
{
// if the array is not initialised
cellcount = 0;
System.out.println(“Array not initialised”);
}

//        int row = 0;
//        int cell = 0;
int ROWDIM=searchtable.length-1;

int[] cellhit = new int[ROWDIM];

while(!found)
{
MatCell mat=new MatCell();
while(searchrow)
{
if(cellcount == cell)
{
cell = 0;
searchrow = false;
}
else
{
//System.out.println(“Array value:”+searchtable[row][cell]);
if(searchtable[row][cell]!=null)
{
if((searchtable[row][cell]).toLowerCase().contains(search.toLowerCase()))
{
mat.row=row;
mat.col=cell;

//    System.out.println(“Found “+searchtable[row][cell]);
found = true;
return(mat);
}
}
cell++;
}
}
row++;
searchrow = true;
if(row==ROWDIM)
{
System.out.println(“Search not found.”);
found = true;    // return true value to break the loop;
}
}
return null;
}

public String[][] getStringArray(JTable jt)
{
String s[][]=new String[jt.getRowCount()][jt.getColumnCount()];

for (int i=0;i<s.length ;i++ )
{
for (int j=0;j<s[0].length ;j++ )
{
s[i][j]=”"+jt.getValueAt(i,j);
}
}

return s;
}

};
button1.addActionListener(findAction);
search.addActionListener(findAction);
p.add(search);
p.add(button1);

button1.setMnemonic (KeyEvent.VK_F);
frame.add(p, BorderLayout.NORTH);

boolean opt=true;
String str=”";

try {
BufferedReader in = new BufferedReader(new FileReader(“printoption.bat”));
String str1=”";
while ((str1 = in.readLine()) != null) {
str=str1;
}
in.close();
} catch (IOException e) {
}

System.out.println(“str=”+str);
if (str.equalsIgnoreCase(“use”))
{
opt=true;
}
else
{
opt=false;
}
opt=true;
int vColIndex1 = 0;

if (opt)
{
table.getColumnModel().getColumn(vColIndex1).setHeaderValue(new ImageIcon(“images/logo.jpg”));
table.getColumnModel().getColumn(vColIndex1).setHeaderRenderer(new TableCellRenderer());

}
int width1 = 500;
table.getColumnModel().getColumn(vColIndex1).setPreferredWidth(width1);

table.setRowHeight(20);
frame.setBounds(400,35,620, 550);

}

JScrollPane scrollPane = new JScrollPane(table);
frame.add(scrollPane, BorderLayout.CENTER);
JButton button = new JButton(“Print”);

ActionListener printAction = new ActionListener() {

public void actionPerformed(ActionEvent e)
{
table.clearSelection();

try{
//JTable table = new JTable(myModel);
PrinterJob job =PrinterJob.getPrinterJob();
MessageFormat headerFormat = new MessageFormat(“”);
MessageFormat footerFormat = new MessageFormat(“”);

Paper pap=new Paper();

pap.setImageableArea(0,500,468,771);

PageFormat pg=job.defaultPage();

pg.setPaper(pap);

System.out.println(“Width=”+pg.getImageableWidth());
System.out.println(“Height=”+pg.getImageableHeight());
Printable    tp=new TablePrintable1(table,JTable.PrintMode.FIT_WIDTH, headerFormat,footerFormat);
job.setPrintable(tp,pg);

if (job.printDialog())
{
job.setJobName(“Theo Printing”);

job.print();
}

}

catch (PrinterException pe)
{System.err.println(“Error printing: “);}

frame.dispose();
}

};
button.addActionListener(printAction);
button.setMnemonic (KeyEvent.VK_P);
frame.add(button, BorderLayout.SOUTH);

frame.setVisible(true);
frame.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
frame.setLocationRelativeTo(null);
}
};
EventQueue.invokeLater(runner);

ovr=”1″;

}

public static void main(String arg[])
{
Calendar c=Calendar.getInstance();
Object chargedata[][]=new Object[16][1];
for (int j=0;j<chargedata.length ;j++ )
{
chargedata[j][0]=”";
//        chargedata[j][1]=”";
}

int j=0;
chargedata[j++][0]=”";
chargedata[j++][0]=”<html><h3>Transaction id :                                     Receipt                                Date : “+c.get(Calendar.DAY_OF_MONTH)+”-”+(c.get(Calendar.MONTH)+1)+”-”+c.get(Calendar.YEAR)+” </h3></html>”;

chargedata[j++][0]=”                                                                                                   “;
chargedata[j++][0]=”RECEIVED with thanks from”;
chargedata[j++][0]=”<html><h4>Mr./Mrs./Ms     </h4></html>”;
chargedata[j++][0]=”<html><h4>Rs.     only,  by </h4><html>”;
chargedata[j++][0]=”towards the following “;
chargedata[j++][0]=”<html><h4>                                         Particulars                                                                                                                       INR </h4></html>”;
//added for theo
chargedata[j++][0]=”<html><h4>———————————————————————————————————————————————————————–</h4></html>”;
chargedata[j++][0]=”Pooja Offering                                                                                                                                                      “;
chargedata[j++][0]=”<html><h4>———————————————————————————————————————————————————————–</h4></html>”;
chargedata[j++][0]=”<html><h3>Date of Pooja : . Time (24 hrs): </h3></html>”;
chargedata[j++][0]=”<html><h6>*Cheque subject to realisation</h6></html>”;
chargedata[j++][0]=”";
chargedata[j++][0]=”";
chargedata[j++][0]=”<html><h4>                                                                                                                                                                 Treasurer </h4></html>”;

String hd[]={“”};

TablePrint.printFrame(chargedata,hd,”1″);

}

///////////////////————————–
}

OUTPUT

Hey guys, this one’s kool. I have been into java programming for the past two years but discovered this simple logic now, after such a long time.

You all are aware of 2D arrays or matrix. We may visualize it like a 2D matrix some what like this

1 2 3

4 5 6

7 8 9

But actually internally in java, this is an Array of arrays. In this particular example, the main array being an array of three more arrays, the child arrays

array 1 : 1 2 3

array 2 :4 5 6

array 3 : 7 8 9

So we can always find the number of colums of a 2D array or a matrix by finding the length of the child arrays.

This code will help u in doing that

String array[][]=new String[100][5];

int nocols =0 ;

try
{
nocols = array[0].length; // array [0] is a child array of our main 2d array
}
catch (ArrayIndexOutOfBoundsException e)
{
// if the array is not initialised
nocols = 0;
System.out.println(“Array not initialised”);
}
And to find the number of  rows in a 2d array, the following code will help u

int norows=array.length;

jai Convergence.

Hi guys,

You all know javac is the java compiler which converts a java file to class file. Similarly we have the exact opposite of it cavaj, which can convert a class file to a java file. It is freely available. You can download it from here. It helps a lot in reverse engineering and trouble shooting some one else’s code.

Just try to use it, It is great.