A.創建型模式
抽象工廠（Abstract Factory）
DocumentBuilderFactory通過FactoryFinder實例化具體的Factory.
使用例子：
DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder();
Document doc = docBuilder.parse (new File("xxx.xml")); javax.xml.transform.TransformerFactory
使用例子： 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)
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);
2.生成器模式（Builder）
java.lang.StringBuilder#append()
java.lang.StringBuffer#append()
這裏我們看到狀態的轉換操作都會返回原來的類型的對象，這樣就可以構建生成鏈。
java.nio.ByteBuffer#put() (CharBuffer, ShortBuffer, IntBuffer, LongBuffer, FloatBuffer 還有 DoubleBuffer)
參見上例。
3.工廠方法（Factory method）
java.util.Calendar#getInstance()
工廠方法的構造方法就在所要生成的類型上。 這個抽象工廠有很大不同。
其它的可參見：
java.util.ResourceBundle#getBundle()
java.text.NumberFormat#getInstance()
java.nio.charset.Charset#forName()
java.net.URLStreamHandlerFactory#createURLStreamHandler(String)
4.原型模式（Prototye）
java.lang.Runtime#getRuntime()