linux安装jdk

tar -zxvf jdk-8u144-linux-x64.tar.gz -C  /usr/local/

vim /etc/profile

添加：
#set java environment
JAVA_HOME=/usr/local/jdk1.8.0_144/
JRE_HOME=/usr/local/jdk1.8.0_144/jre
CLASS_PATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib
PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin
export JAVA_HOME JRE_HOME CLASS_PATH PATH

source /etc/profile