: This class represents a list, which, in turn, contains a number of ListItems. Various fonts are declared as static constants in this class. : This class contains all specifications of a font, such as family of font, size, style, and color. It is created using a Paragraph as title and an int as chapter number. : This class represents a chapter in the PDF document. In a paragraph you can set the paragraph alignment, indentation and spacing before and after the paragraph. : This class represents a indented “paragraph” of text. After that you add content to the document. First you must create a Document instance. If you need to generate a PDF document from scratch, you will use the Document class. : This is the most important class in iText library and represent PDF document instance. Let’s list down and get familiar with the essential classes we will use in this application. Or we can download the latest jar files from its maven repository. To add iText into your application, include the following maven repository into our pom.xml file. 
There are many more features available with iText which I will leave on you to explore. The iText library contains classes to generate PDF text in various fonts, create tables in PDF documents, add watermarks to pages, and so on. Also, the structure of iText allows us to generate any of the above-mentioned type of documents with the same code. We can choose from various fonts to be used in the document. The iText library is powerful and supports the generation of HTML, RTF, and XML documents and generating PDFs. Note that though iText is open source, you still need to purchase a commercial license if you want to use it for commercial purposes. On the brighter side, iText is an open-source library.
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