问题: 我该如何在 Elemetary OS Luna 上安装Oracle Java 7？

回答: 在 Elementary OS Luna 安装 Java 7 的步骤如下: 由于Elementary OS是基于Ubuntu，所以我们允许使用具有多种Java包的WEPUD8 PPA。

1. 打开终端。

2. 运行以下指令添加Java的PPA到你的软件仓:

   $ sudo add-apt-repository ppa:webupd8team/java
   
   You are about to add the following PPA to your system:
   Oracle Java (JDK) Installer (automatically downloads and installs Oracle JDK6 / JDK7 / JDK8). There are no actual Java files in this PPA. More info: http://www.webupd8.org/2012/01/install-oracle-java-jdk-7-in-ubuntu-via.html
   Debian installation instructions: http://www.webupd8.org/2012/06/how-to-install-oracle-java-7-in-debian.html
   More info: https://launchpad.net/~webupd8team/+archive/java
   Press [ENTER] to continue or ctrl-c to cancel adding it
   

3. 按回车继续

   gpg: keyring `/tmp/tmpB5WwDG/secring.gpg' created
   gpg: keyring `/tmp/tmpB5WwDG/pubring.gpg' created
   gpg: requesting key EEA14886 from hkp server keyserver.ubuntu.com
   gpg: /tmp/tmpB5WwDG/trustdb.gpg: trustdb created
   gpg: key EEA14886: public key "Launchpad VLC" imported
   gpg: Total number processed: 1
   gpg: imported: 1 (RSA: 1)
   OK
   

4. 现在更新你的系统

   $ sudo apt-get update
   

5. 运行以下命令安装Java 7:

   $ sudo apt-get install oracle-java7-installer
   
   [sudo] password for enock:
   Reading package lists... Done
   Building dependency tree
   Reading state information... Done
   The following packages were automatically installed and are no longer required:
   gir1.2-gstreamer-0.10 libilmbase6 libmagickcore4 libmagickwand4 libcdt4
   libmagickcore4-extra liblqr-1-0 imagemagick-common libpathplan4 libopenexr6
   rsync netpbm libgvc5 libnetpbm10 libgraph4
   Use 'apt-get autoremove' to remove them.
   The following extra packages will be installed:
   gsfonts-x11 java-common
   Suggested packages:
   default-jre equivs binfmt-support visualvm ttf-baekmuk ttf-unfonts
   ttf-unfonts-core ttf-kochi-gothic ttf-sazanami-gothic ttf-kochi-mincho
   ttf-sazanami-mincho ttf-arphic-uming
   The following NEW packages will be installed:
   gsfonts-x11 java-common oracle-java7-installer
   0 upgraded, 3 newly installed, 0 to remove and 196 not upgraded.
   Need to get 88.5 kB of archives.
   After this operation, 473 kB of additional disk space will be used.
   Do you want to continue [Y/n]?
   

6. 输入代表Yes的Y以及回车键继续安装。

7. 在安装过程中，你需要同意条款才能继续。选择OK。

   

8. 然后选择Yes继续。

   

9. 现在请等待安装包的下载与自动安装:

   

10. 安装完成。你可以在终端上查看Java版本:

    $ java -version
    java version "1.7.0_45"
    Java(TM) SE Runtime Environment (build 1.7.0_45-b18)
    Java HotSpot(TM) 64-Bit Server VM (build 24.45-b08, mixed mode)
    

via: http://www.unixmen.com/install-oracle-java-7-elementary-os-luna-via-ppa/

译者：whatever1992 校对：wxy

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