Installing Oracle Java 7 in Debian via apt-get repository doesn't seems to work.
apt-get install oracle-java7-installer
Look like apt-get does not recognize oracle-java7-installer.
AzizSM
Managed to get answer after do some google..
echo "deb http://ppa.launchpad.net/webupd8team/java/ubuntu precise main" | tee -a /etc/apt/sources.list
echo "deb-src http://ppa.launchpad.net/webupd8team/java/ubuntu precise main" | tee -a /etc/apt/sources.list
apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys EEA14886
apt-get update
# Java 7
apt-get install oracle-java7-installer
# For Java 8 command is:
apt-get install oracle-java8-installer
来源：https://stackoverflow.com/questions/15543603/installing-java-7-oracle-in-debian-via-apt-get