apt源中的版本太老了，JDK7已经出了，裸装一下。
转载自：http://blog.sina.com.cn/s/blog_71708d570100zdqt.html
1. Download http://download.oracle.com/otn-pub/java/jdk/7/jdk-7-linux-i586.tar.gz.
2. Decompress the .tar.gz file.
3. Move the JDK files to /usr/lib/jvm/jdk1.7.0 or elsewhere you like.
4. $sudo vim /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
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
And then reload .bashrc file:
source ~/.bashrc
5. Run the following commands:
sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/jdk1.7.0/bin/java 300 sudo update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/jdk1.7.0/bin/javac 300 sudo update-alternatives --install /usr/bin/javap javap /usr/lib/jvm/jdk1.7.0/bin/javap 300 sudo update-alternatives --install /usr/bin/javadoc javadoc /usr/lib/jvm/jdk1.7.0/bin/javadoc 300 sudo update-alternatives --install /usr/bin/jps jps /usr/lib/jvm/jdk1.7.0/bin/jps 300
Installation has now done. Run $java -version for a test.