jdk/jre的安装配置及环境变量的讲解

classpath、path、JAVA_HOME的作用及JAVA环境变量配置

http://www.cnblogs.com/xwdreamer/archive/2010/09/08/2297098.html

jdk1.8_121安装及运行环境配置

http://blog.csdn.net/qq_37061799/article/details/59629787

JDK安装后，输入javac无法运行的问题

http://jingyan.baidu.com/article/d8072ac468bc1dec95cefddb.html