http://unix.stackexchange.com/questions/43150/how-to-completely-remove-java-6-and-install-java-jdk-7-on-linux-mint-13
# Must install 7 first or else when uninstalling six, it will try to install a bunch of replacement gcj stuff.
sudo apt-get install openjdk-7-jdk
sudo apt-get remove openjdk-6-jre
sudo apt-get remove openjdk-6-jre-lib
本文介绍如何在Linux Mint 13系统中彻底移除Java 6并安装Java 7 JDK。首先安装Java 7 JDK,然后移除Java 6 JRE及其相关库。

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