新增 JLayer 类，是一个灵活而且功能强大的Swing组件修饰器，使用方法：How to Decorate Components with JLayer.
Nimbus Look and Feel 外观从 com.sun.java.swing 包移到 javax.swing 包中，详情：javax.swing.plaf.nimbus
更轻松的重量级和轻量级组件的混合
支持透明窗体以及非矩形窗体的图形界面，请看 How to Create Translucent and Shaped Windows
JColorChooser 类新增 HSV tab.
网络
新增 URLClassLoader.close 方法，请看 Closing a URLClassLoader.
支持 Sockets Direct Protocol (SDP) 提供高性能网络连接，详情请看 Understanding the Sockets Direct Protocol.
拖拽的小程序使用一个默认或者定制的标题进行修饰，详情：Requesting and Customizing Applet Decoration in Draggable Applets.
JNLP 文件做了如下方面的增强，详情请看 JNLP File Syntax:
The os attribute in the information and resources elements can now contain specific versions of Windows, such as Windows Vista or Windows 7.
Applications can use the install attribute in the shortcut element to specify their their desire to be installed. Installed applications are not removed when the Java Web Start cache is cleared, but can be explicitly removed using the Java Control Panel.
Java Web Start applications can be deployed without specifying the codebase attribute; see Deploying Without Codebase
可直接在 HTML 中嵌入 JNLP 文件：Embedding JNLP File in Applet Tag.
可在 JavaScript 代码中检查 Applet 是否已经加载完成：Handling Initialization Status With Event Handlers.
可在 Applet 从快捷方式启动或者拖出浏览器时对窗口样式和标题进行控制：Requesting and Customizing Applet Decoration in Developing Draggable Applets.
XML
包含 Java API for XML Processing (JAXP) 1.4.5, 支持 Java Architecture for XML Binding (JAXB) 2.2.3, 和 Java API for XML Web Services (JAX-WS) 2.2.4.
java.lang 包
消除了在多线程环境下的非层次话类加载时导致的潜在死锁，详情：Multithreaded Custom Class Loaders in Java SE 7.
