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