[Java]Install JDK 7

cat /proc/version
#Linux version 3.2.0-60-generic (buildd@toyol) (gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5) ) #91-Ubuntu SMP Wed Feb 19 03:54:44 UTC 2014

#jdk 7
sudo apt-get install openjdk-7-jdk