ubuntu安装jdk7

download:
http://www.oracle.com/technetwork/java/javase/downloads/index.html?ssSourceSiteId=ocomen
sudo mkdir /usr/lib/jvm

sudo tar zxvf jdk-7u40-linux-x64.tar.gz -C /usr/lib/jvm

 cd /usr/lib/jvm/

sudo mv jdk1.7.0/ java-7-sun

vim ~/.bash_profile

export JAVA_HOME=/usr/lib/jvm/java-7-sun  
export JRE_HOME=${JAVA_HOME}/jre  
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib  
export PATH=${JAVA_HOME}/bin:$PATH 
source ~/.bash_profile