1 下载jdk
http://download.oracle.com/otn-pub/java/jdk/7u5-b06/jdk-7u5-linux-i586.tar.gz
2 将jdk解压到制定目录
3 $sudo gedit /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
4 source ~/.bashrc
5
sudo update-alternatives --install /usr/bin/java java /lib/jdk1.7.0_05/bin/java 300
sudo update-alternatives --install /usr/bin/javac javac /lib/jdk1.7.0_05/bin/javac 300
sudo update-alternatives --install /usr/bin/javap javap /lib/jdk1.7.0_05/bin/javap 300
sudo update-alternatives --install /usr/bin/jps jps /lib/jdk1.7.0_05/bin/jps 300
sudo update-alternatives --install /usr/bin/javadoc javadoc /lib/jdk1.7.0_05/bin/javadoc 300