As u mentioned apt-get, I am assuming u r using Ubuntu.... If this is Ok, u can use the webupd8 java ppa, so u get updates automatically through the package manager. then pass the commands.....
sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java7-installer
sudo update-java-alternatives -s java-7-oracle

Or u can dnld tar file to install it manually.