[root@app-01 alternatives]# java -versionjava version "1.6.0_20"OpenJDK Runtime Environment (IcedTea6 1.9.7) (rhel-1.39.1.9.7.el6-x86_64)OpenJDK 64-Bit Server VM (build 19.0-b09, mixed mode)如果是oracle的jdk，输入java -version显示的版本信息为 java version "1.6.0...
openjdk version "11.0.10" 2021-01-19 OpenJDK Runtime Environment (build 11.0.10+9-Ubuntu-0ubuntu1.20.04) OpenJDK 64-Bit Server VM (build 11.0.10+9-Ubuntu-0ubuntu1.20.04, mixed mode, sharing) 如果输出信息中没有明确提及“Oracle”或“OpenJDK”,你可能需要查看JDK的安装路径或进一步检查系统...