安装JDK
sudo chmod u+x jdk-6u45-linux-x64.bin
./jdk-6u45-linux-x64.bin
环境变量配置
gedit /etc/profile
# Added java environment variables.
export JAVA_HOME=/usr/lib/jvm/java/jdk1.6.0_45
export JRE_HOME=${JAVA_HOME}/jre
export PATH=$PATH:${JAVA_HOME}/bin
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
确认是否安装成功
java -version
删除JDK
sudo rm -rf /usr/lib/jvm/java/jdk1.6.0_45
更新etc/profile，删除安装时添加的环境变量
source /etc/profile
