ubuntu jdk install
1.下载jdk-7u75-linux-x64.tar.gz，默认在/home/csf/Downloads
2.csf@ubuntu:~/Downloads$ sudo mkdir /usr/java
3.csf@ubuntu:~/Downloads$ sudo tar zxvf jdk-7u75-linux-x64.tar.gz -C /usr/java
4.csf@ubuntu:/usr/java$
5.csf@ubuntu:/usr/java$ sudo gedit /etc/environment
PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:$JAVA_HOME/bin"
export CLASSPATH=.:$JAVA_HOME/lib:$JAVA_HOME/jre/lib
export JAVA_HOME=/usr/java/jdk1.7.0_75
6.csf@ubuntu:/usr/java$ source /etc/environment
7.csf@ubuntu:/usr/java$ sudo gedit /etc/profile
#set java environment
JAVA_HOME=/usr/java/jdk1.7.0_75
export JRE_HOME=/usr/java/jdk1.7.0_75/jre
export CLASSPATH=.:$JAVA_HOME/lib:$JRE_HOME/lib:$CLASSPATH
export PATH=$JAVA_HOME/bin:$JRE_HOME/bin:$PATH
8.csf@ubuntu:/usr/java$ source /etc/profile
csf@ubuntu:/usr/java$ java -version
java version "1.7.0_75"
Java(TM) SE Runtime Environment (build 1.7.0_75-b13)
Java HotSpot(TM) Client VM (build 24.75-b04, mixed mode)
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