Shulou(Shulou.com)06/01 Report--

a. Create a model

Abstract Factory (Abstract Factory)

Javax.xml.parsers.DocumentBuilderFactory

DocumentBuilderFactory instantiates the concrete Factory through FactoryFinder.

Examples of use: DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance (); DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder (); Document doc = docBuilder.parse (new File ("xxx.xml"))

Javax.xml.transform.TransformerFactory

Use examples: StreamSource source = new StreamSource (...); StreamSource stylesource = new StreamSource (...); TransformerFactory factory = TransformerFactory.newInstance (); Transformer transformer = factory.newTransformer (stylesource); StreamResult result = new StreamResult (System.out); transformer.transform (source, result)

Javax.xml.xpath.XPathFactory

The structure is almost the same as the previous two.

XPathFactory xpathFactory = XPathFactory.newInstance (); XPath xpath = xpathFactory.newXPath (); XPathExpression expr = xpath.compile (XPATH_EXPRESSION_STRING); Object result = expr.evaluate (Object item, QName returnType)

two。 Generator mode (Builder)

Java.lang.Appendable

Java.lang.StringBuilder#append ()

Java.lang.StringBuffer#append ()

Here we see that state transition operations return objects of the original type, so that the generation chain can be built.

Java.nio.ByteBuffer#put () (CharBuffer, ShortBuffer, IntBuffer, LongBuffer, FloatBuffer and DoubleBuffer)

See the example above.

3. Factory method (Factory method)

Java.util.Calendar#getInstance ()

The constructor of the factory method is on the type to be generated. This abstract factory is very different.

For more information, please see:

Java.util.ResourceBundle#getBundle ()

Java.text.NumberFormat#getInstance ()

Java.nio.charset.Charset#forName ()

Java.net.URLStreamHandlerFactory#createURLStreamHandler (String)

4. Prototype pattern (Prototye)

Java.lang.Object#clone ()

5. Singleton mode (Singleton)

Java.lang.Runtime#getRuntime ()

Java.awt.Desktop#getDesktop ()

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