windows 10 配置jdk环境变量遇到 javac或者jar 不是内部或外部命令问题

1. 检查环境变量是否错误，常见环境变量错误：变量结尾 分号( ; )缺失

2. win10比较特别，在配置path环境变量是必须用绝对路径，不能用%JAVA_HOME% 这种

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