A.创建型模式抽象工厂(Abstract Factory)javax.xml.parsers.DocumentBuilderFactory DocumentBuilderFactory
A.创建型模式
抽象工厂(Abstract Factory)
javax.xml.parsers.DocumentBuilderFactory
DocumentBuilderFactory通过FactoryFinder实例化具体的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)
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);
2.生成器模式(Builder)
java.lang.Appendable
java.lang.StringBuilder#append()
java.lang.StringBuffer#append()
这里我们看到状态的转换操作都会返回原来的类型的对象,这样就可以构建生成链。
java.nio.ByteBuffer#put()
(CharBuffer
, ShortBuffer
, IntBuffer
, LongBuffer
, FloatBuffer
还有 DoubleBuffer
)
参见上例。
3.工厂方法(Factory method)
java.util.Calendar#getInstance()
工厂方法的构造方法就在所要生成的类型上。 这个抽象工厂有很大不同。
其它的可参见:
java.util.ResourceBundle#getBundle()
java.text.NumberFormat#getInstance()
java.NIO.charset.Charset#forName()
java.net.URLStreamHandlerFactory#createURLStreamHandler(String)
java.lang.Object#clone()
5.单例模式(Singleton)
java.lang.Runtime#getRuntime()
java.awt.Desktop#getDesktop()
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本文标题: JDK 源码 阅读 - 2 - 设计模式 - 创建型模式
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