PDF Java Tutorial

import java.awt.Color;
import java.io.FileOutputStream;
import com.lowagie.text.Document;
import com.lowagie.text.PageSize;
import com.lowagie.text.Paragraph;
import com.lowagie.text.Rectangle;
import com.lowagie.text.pdf.PdfPCell;
import com.lowagie.text.pdf.PdfPTable;
import com.lowagie.text.pdf.PdfWriter;
public class MainClass {
  public static void main(String[] args) throws Exception {
    Document document = new Document(PageSize.A4.rotate());
    PdfWriter.getInstance(document, new FileOutputStream("2.pdf"));
    document.open();
    PdfPTable table = new PdfPTable(4);
    table.setWidthPercentage(100);
    PdfPCell cell;
    cell = new PdfPCell(new Paragraph("t"));
    table.addCell(cell);
    cell = new PdfPCell(new Paragraph("d"));
    cell.setBorder(Rectangle.NO_BORDER);
    cell.setBackgroundColor(Color.red);
    table.addCell(cell);
    cell = new PdfPCell(new Paragraph("r"));
    table.addCell(cell);
    cell = new PdfPCell(new Paragraph("b"));
    table.addCell(cell);
    cell = new PdfPCell(new Paragraph("G:"));
    table.addCell(cell);
    cell = new PdfPCell(new Paragraph("0.25"));
    cell.setBorder(Rectangle.NO_BORDER);
    cell.setGrayFill(0.25f);
    table.addCell(cell);
    cell = new PdfPCell(new Paragraph("0.5"));
    cell.setBorder(Rectangle.NO_BORDER);
    cell.setGrayFill(0.5f);
    table.addCell(cell);
    cell = new PdfPCell(new Paragraph("0.75"));
    cell.setBorder(Rectangle.NO_BORDER);
    cell.setGrayFill(0.75f);
    table.addCell(cell);
    cell = new PdfPCell(new Paragraph(":"));
    table.addCell(cell);
    cell = new PdfPCell(new Paragraph("a"));
    table.addCell(cell);
    cell = new PdfPCell(new Paragraph("b"));
    table.addCell(cell);
    cell = new PdfPCell(new Paragraph("o"));
    cell.setBorderWidth(6f);
    cell.setBorderColor(Color.orange);
    table.addCell(cell);    
    document.add(table);
    document.close();
  }
}