在Centos下用alternative命令切换各个版本的jdk的方法
https://blog.csdn.net/nsrainbow/article/details/43273991
https://blog.csdn.net/yzh_1346983557/article/details/81509329
https://blog.csdn.net/nsrainbow/article/details/43273991
https://blog.csdn.net/yzh_1346983557/article/details/81509329