Ubunut 安装JDK

卸载openjdk
sudo apt-get purge openjdk*
cd /
mkdir java

tar -zxvf ./jdk-8u60-linux-x64.gz

pwd
/java/jdk1.8.0_60

vi /etc/profile
添加代码:  
#set java environment  
export JAVA_HOME=/java/jdk1.8.0_60
export PATH=$JAVA_HOME/bin:$PATH
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar