刷机后的环境变量

CLASSPATH
.;%JAVA_HOME%lib;%JAVA_HOME%lib ools.jar

JAVA_HOME
%jdk7%

jdk6
H:java6jdk1.6

jdk7
H:java7jdk1.7.0_75

jdk8
H:Javajdk1.8.0_152

M2_HOME
J:apache-maven-3.5.2-binapache-maven-3.5.2

Path
%JAVA_HOME%in;%JAVA_HOME%jrein;F:mysql-5.7.20-winx64mysql-5.7.20-winx64in;%M2_HOME%in;

2、linux下怎么安装jdk

 https://blog.csdn.net/qq_42815754/article/details/82968464