jdk环境变量

JAVA_HOME：（根据个人安装路径而变）D:\Program Files (x86)\Java\jdk;

Path:（不变）%JAVA_HOME%/bin;%JAVA_HOME%/jre/bin;

ClassPath:（不变）.;%JAVA_HOME%/lib/dt.jar;%JAVA_HOME%/lib/tools.jar;