1、下载地址 http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html
2、环境变量配置
我的电脑----属性----高级系统设置----环境变量
CLASSPATH= .;%JAVA_HOME%/lib/dt.jar;%JAVA_HOME%/lib/tools.jar
JAVA_HOME = C:/Program Files/Java/jdk1.5.0
PATH = %JAVA_HOME%/bin;%JAVA_HOME%/jre/bin
3、jdk安装目录
