Ubuntu14.04 安装openjdk7和openjdk8与切换

  1.      安装java sudo add-apt-repository ppa:openjdk-r/ppabash sudo apt-get updatejvm sudo apt-get install openjdk-7-jdkrem sudo apt-get install openjdk-8-jdkget   2.      删除软连接it 切换路径到/etc/alternativ

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