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Java 是一款跨平台的软件设计语言，Oracle Java 7 为一些程序使用提供环境需求，甲骨文公司发布了 Java 7 Update 40 (7u40) ，WebUpd8 Java PPA 也被更新，大家可以方便的安装 Oracle Java 7 Update 40 (7u40)，支持 Ubuntu 和 debian 用户。
Oracle Java 7u40 引入了以下新的特点：
- Java Mission Control (JMC), an advanced monitoring and diagnostics tool inherited from JRockit is now fully supported on JDK 7. This is a commercial feature;
- Part of JMC, Java Flight Recorder enables you to record events and metrics during runtime and extract them at will;
- support for the Retina display with Swing/AWT and JavaFX;
- new JDK binary for hardfloat Linux/ARM, for ARM-based micro servers and development boards. With this, JDK 7 now officially supports the Rasbian Linux distribution (for Raspberry Pi);
- a new Deployment Rule Set feature to enable fine granular controls for execution of Applet and WebStart applications;
- security feature enhancements for applets, JAXP and x.509 certificates.
还有大量的BUG 修复
Ubuntu PPA安装，打开终端，输入以下命令：
sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java7-installer
相关阅读：
Ubuntu 安装Oracle Java 7 (JDK) http://www.linuxidc.com/Linux/2011-09/43025.htm
Oracle JDK 7u40 发布 http://www.linuxidc.com/Linux/2013-09/89982.htm
更多Ubuntu相关信息见Ubuntu 专题页面 http://www.linuxidc.com/topicnews.aspx?tid=2
