本文详细介绍了如何在Ubuntu系统上正式支持Oracle Java 7，包括添加存储库、更新包、设置环境变量等步骤，确保Java 7安装保持最新状态。
Using Oracle Java 7 is not formally supported by Ubuntu. There's plenty solutions for installing it, listed on https://help.ubuntu.com/community/Java .
The simplest one listed is this one:
sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java7-installerIt'll keep your java 7 installation up to date.
To automatically set up the Java 7 environment variables JAVA_HOME and PATH:
sudo apt-get install oracle-java7-set-default
原文：http://stackoverflow.com/questions/16263556/installing-java-7-on-ubuntu
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