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