Display row number in WinForms DataGridView

In WinForms Applications, to display the row number in the row header, we could use the RowPostPaint event of DataGridView control.


USAGE:
Suppose grid is named as dgvUserDetails

DELEGATE:

this.dgvUserDetails.RowPostPaint += new System.Windows.Forms.DataGridViewRowPostPaintEventHandler(this.dgvUserDetails_RowPostPaint);

CODE:
private void dgvUserDetails_RowPostPaint(object sender, DataGridViewRowPostPaintEventArgs e)
{
        using (SolidBrush b = new SolidBrush(dgvUserDetails.RowHeadersDefaultCellStyle.ForeColor))
        {
              e.Graphics.DrawString((e.RowIndex + 1).ToString(), e.InheritedRowStyle.Font, b, e.RowBounds.Location.X + 10, e.RowBounds.Location.Y + 4);
        }
}

Don’t try to manipulate the Code part much because the X and Y are calculated co-ordinates in the row header area or you can customizse test it yourself to see the various results.

Determine whether Java version is 32-Bit or 64-Bit

Sun Java has provided a System property to determine whether installed version supports 32-Bit or 64 Bit named "sun.arch.data.model".

sun.arch.data.model=32 // 32 bit JVM
sun.arch.data.model=64 // 64 bit JVM

Try the following in your Java program: System.out.print(System.getProperty("sun.arch.data.model")) ; Other option is on command line use the following command, it will give you the details about the version and Bits:
java - version





C:\>java -version
java version "1.6.0_31"
Java(TM) SE Runtime Environment (build 1.6.0_31-b05)
Java HotSpot(TM) 64-Bit Server VM (build 20.6-b01, mixed mode)

Extract Numbers from a String


public static List extractNumsFromStr(String line) {
List numbers = new ArrayList();
Long no;
String number = null;
Pattern p = Pattern.compile("\\d+");
Matcher m = p.matcher(line);

while (m.find()) {
number = m.group();
no = Long.parseLong(number);
numbers.add(no);
}
return numbers;
}