Ubuntu 下安装Java

http://jingyan.baidu.com/article/eb9f7b6d8f82a6869364e8a7.html

安装jdk

http://blog.csdn.net/sxdtzhaoxinguo/article/details/43731677

tar xvf FileName.tar

#  set java environment
export JAVA_HOME=/usr/lib/jvm/jdk1.8.0_65
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib

export PATH=${JAVA_HOME}/bin:$PATH

export JAVA_HOME=/usr/local/java/jdk1.8.0_111 

export JRE_HOME=/usr/local/java/jdk1.8.0_111/jre 

export PATH=$PATH:/usr/local/java/jdk1.8.0_111/bin 

export CLASSPATH=./:/usr/local/java/jdk1.8.0_111/lib:/usr/local/java/jdk1.8.0_111/jre/lib

让/etc/profile文件修改后立即生效 ,可以使用如下命令:
# .  /etc/profile

注意: . 和 /etc/profile 有空格

eclipse安装pydev

http://www.cnblogs.com/restran/archive/2011/11/11/2245812.html