Ubuntu 安装双jdk 1.5+1.6

sudo add-apt-repository "deb http://archive.canonical.com/ lucid partner"
sudo apt-get update
sudo apt-get install sun-java6-jdk
sudo add-apt-repository "deb http://archive.ubuntu.com/ubuntu hardy main multiverse"
sudo add-apt-repository "deb http://archive.ubuntu.com/ubuntu
hardy-updates main multiverse"
sudo apt-get update
sudo apt-get install sun-java5-jdk

上述方法只是用于 从来没有安装过jdk并且也没有对jdk进行配置 适合刚装完系统

切换方法

sudo update-alternatives --config java 
sudo update-alternatives --config javac
sudo update-alternatives --config javadoc