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Using PdfContentByte to draw Circles

import java.io.FileOutputStream; import com.lowagie.text.Document; import com.lowagie.text.pdf.PdfContentByte; import com.lowagie.text.pdf.PdfWriter; public class CirclesPDF {   public static void main(String[] args) {     Document document = new Document();     try {       PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream("CirclesPDF.pdf"));       document.open();       PdfContentByte cb = writer.getDirectContent();       cb.circle(250.0f, 500.0f, 200.0f);       cb.circle(250.0f, 500.0f, 150.0f);       cb.circle(350.0f, 300.0f, 150.0f);       cb.stroke();            } catch (Exception e) {       System.err.println(e.getMessage());     }     document.close();   } }                     itext.zip( 1,748 k)