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    <p>All of the Document classes you list have the same base functionality and each expands based on a niche that needs to be filled. Really, it's just a matter of realizing what you need to do and use the appropriate document type. For instance, if I am editing an HTML file, then I would use the HTMLDocument class.</p> <p>I included a brief description of each of the Document classes you requested in your question below.</p> <p><a href="http://java.sun.com/j2se/1.4.2/docs/api/org/w3c/dom/Document.html" rel="nofollow noreferrer">Document</a></p> <blockquote> <p>The Document interface represents the entire HTML or XML document. Conceptually, it is the root of the document tree, and provides the primary access to the document's data.</p> </blockquote> <p>This is the interface that all other Document types will inherit from. It provides the contract for all other Document types to follow.</p> <p><a href="http://java.sun.com/j2se/1.4.2/docs/api/javax/swing/text/AbstractDocument.html" rel="nofollow noreferrer">AbstractDocument</a></p> <blockquote> <p>This class implements a locking mechanism for the document it allows multiple readers or one writer, and writers must wait until all observers of the document have been notified of a previous change before beginning another mutation to the document.</p> </blockquote> <p>This class allows you to work with different types of documents and uses a very lose ruleset. This class is more difficult to implement because it is so generic.</p> <p><a href="http://java.sun.com/j2se/1.4.2/docs/api/javax/swing/text/StyledDocument.html" rel="nofollow noreferrer">StyledDocument</a></p> <p>Another interface that provides a contract for all styled documents. <a href="http://java.sun.com/j2se/1.4.2/docs/api/javax/swing/text/DefaultStyledDocument.html" rel="nofollow noreferrer">DefaultStyledDocument</a> implements this interface, so we'll get to that next.</p> <p><a href="http://java.sun.com/j2se/1.4.2/docs/api/javax/swing/text/DefaultStyledDocument.html" rel="nofollow noreferrer">DefaultStyledDocument</a></p> <blockquote> <p>A document that can be marked up with character and paragraph styles in a manner similar to the Rich Text Format. The element structure for this document represents style crossings for style runs. These style runs are mapped into a paragraph element structure (which may reside in some other structure). The style runs break at paragraph boundaries since logical styles are assigned to paragraph boundaries.</p> </blockquote> <p>DefaultStyledDocument allows you to place special characters within the document to help with formatting etc... Think Microsoft Word when you think about DefaultStyledDocument.</p> <p><a href="http://java.sun.com/j2se/1.4.2/docs/api/javax/swing/text/DocumentFilter.html" rel="nofollow noreferrer">DocumentFilter</a></p> <blockquote> <p>hen a Document containing a DocumentFilter is modified (either through insert or remove), it forwards the appropriate method invocation to the DocumentFilter.</p> </blockquote> <p>This is an extremely useful class that "listens" for events to occur against your document (i.e. modification) and will perform an action when each event occurs.</p> <p><a href="http://java.sun.com/j2se/1.4.2/docs/api/javax/swing/text/PlainDocument.html" rel="nofollow noreferrer">PlainDocument</a></p> <p>implements AbstractDocument and does not contain any kind of formatting special characters (Think notepad vs. Word). You should use this when you just want to store text (log file, etc.)</p> <p><a href="http://java.sun.com/j2se/1.4.2/docs/api/javax/swing/text/html/HTMLDocument.html" rel="nofollow noreferrer">HTMLDocument</a></p> <blockquote> <p>A document that models HTML. The purpose of this model is to support both browsing and editing.</p> </blockquote> <p>HTMLDocument should be used when you are creating/modifying documents that contain HTML code and are intended to be viewed in a browser.</p>
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