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linyu19872008
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ubuntu安装jdk

 
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    1. Download the following file:
    http://download.oracle.com/otn-pub/java/jdk/7/jdk-7-linux-i586.tar.gz (32-bit)
    http://download.oracle.com/otn-pub/java/jdk/7u1-b08/jdk-7u1-linux-x64.tar.gz (64-bit)

    2. Decompress the .tar.gz file.

    3. Move the JDK files to /usr/lib/jvm/jdk1.7.0 or elsewhere you like.

    4. $sudo gvim /etc/environment  

    You will see

    PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games"

    Change the file as (change the installation path if needed)

    PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/lib/jvm/jdk1.7.0/bin"  
    CLASSPATH=.:/usr/lib/jvm/jdk1.7.0/lib  
    JAVA_HOME=/usr/lib/jvm/jdk1.7.0 

    And then reload .bashrc file:

    source ~/.bashrc


    5. Run the following commands: 

    $sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/jdk1.7.0/bin/java 300
    $sudo update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/jdk1.7.0/bin/javac 300
    $sudo update-alternatives --install /usr/bin/javap javap /usr/lib/jvm/jdk1.7.0/bin/javap 300
    $sudo update-alternatives --install /usr/bin/javadoc javadoc /usr/lib/jvm/jdk1.7.0/bin/javadoc 300

    Installation has now done. Run $java -version for a test.
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