Ubuntu 中升级至 JDK7

sudo apt-get update
sudo apt-get install software-properties-common python-software-properties
sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java7-installer
sudo update-alternatives --config java

sudo apt-get update sudo apt-get install software-properties-common python-software-properties sudo add-apt-repository ppa:webupd8team/java sudo apt-get update sudo apt-get install oracle-java7-installer sudo update-alternatives --config java