ubuntu12.04 PPA 安装 java7

PPA安装：sudo add-apt-repository ppa:webupd8team/javasudo apt-get updatesudo apt-get install oracle-java7-installer千万不要用 否则会报错安装不了　　sudo add-apt-repository ppa:eugenesan/java如果已经用了可以：

sudo rm /var/lib/dpkg/info/oracle-java7-installer*sudo apt-get purge oracle-java7-installer*sudo rm /etc/apt/sources.list.d/*java*sudo apt-get updatesudo add-apt-repository ppa:webupd8team/javasudo apt-get updatesudo apt-get install oracle-java7-installer参考：http://askubuntu.com/questions/126372/sha256sum-mismatch-jdk-7u3-linux-x64-tar-gz-error-when-trying-to-install-orac

卸载：sudo apt-get install ppa-purgesudo ppa-purge ppa:upubuntu-com/javasudo apt-get remove oracle-java7-installersudo apt-get update