有人能让我知道我如何知道我的RHEL8.1操作系统上安装的openjdk是oracle版本还是redhat版本吗？下面是java-version、java-fullversion的输出，其中是java。

[root@RHEL ~]# java -version
openjdk version "11.0.9" 2020-10-20 LTS
OpenJDK Runtime Environment 18.9 (build 11.0.9+11-LTS)
OpenJDK 64-Bit Server VM 18.9 (build 11.0.9+11-LTS, mixed mode, sharing)
[root@RHEL ~]# java -fullversion
openjdk full version "11.0.9+11-LTS"
[root@RHEL ~]# whereis java
java: /usr/bin/java /usr/lib/java /etc/java /usr/share/java /usr/share/man/man1/java.1.gz
[root@RHEL ~]#

另外，如果这不是redhat build java，有人能告诉我如何安装redhat build openjdk吗？我运行了下面的命令来列出所有openjdk，但是我试图理解这里显示的输出是redhat build openjdk还是oracle build openjdk。

[root@RHEL ~]# yum list available \*openjdk\*

Updating Subscription Management repositories.
Last metadata expiration check: 1:11:35 ago on Tue 01 Dec 2020 11:49:38 AM EST.
Available Packages
java-1.8.0-openjdk.x86_64                         1:1.8.0.272.b10-3.el8_3           rhel-8-for-x86_64-appstream-rpms
java-1.8.0-openjdk-accessibility.x86_64           1:1.8.0.272.b10-3.el8_3           rhel-8-for-x86_64-appstream-rpms
java-1.8.0-openjdk-demo.x86_64                    1:1.8.0.272.b10-3.el8_3           rhel-8-for-x86_64-appstream-rpms
java-1.8.0-openjdk-devel.x86_64                   1:1.8.0.272.b10-3.el8_3           rhel-8-for-x86_64-appstream-rpms
java-1.8.0-openjdk-headless.x86_64                1:1.8.0.272.b10-3.el8_3           rhel-8-for-x86_64-appstream-rpms
java-1.8.0-openjdk-javadoc.noarch                 1:1.8.0.272.b10-3.el8_3           rhel-8-for-x86_64-appstream-rpms
java-1.8.0-openjdk-javadoc-zip.noarch             1:1.8.0.272.b10-3.el8_3           rhel-8-for-x86_64-appstream-rpms
java-1.8.0-openjdk-src.x86_64                     1:1.8.0.272.b10-3.el8_3           rhel-8-for-x86_64-appstream-rpms
java-11-openjdk-demo.x86_64                       1:11.0.9.11-2.el8_3               rhel-8-for-x86_64-appstream-rpms
java-11-openjdk-javadoc.x86_64                    1:11.0.9.11-2.el8_3               rhel-8-for-x86_64-appstream-rpms
java-11-openjdk-javadoc-zip.x86_64                1:11.0.9.11-2.el8_3               rhel-8-for-x86_64-appstream-rpms
java-11-openjdk-jmods.x86_64                      1:11.0.9.11-2.el8_3               rhel-8-for-x86_64-appstream-rpms
java-11-openjdk-src.x86_64                        1:11.0.9.11-2.el8_3               rhel-8-for-x86_64-appstream-rpms
java-11-openjdk-static-libs.x86_64                1:11.0.9.11-2.el8_3               rhel-8-for-x86_64-appstream-rpms
[root@RHEL ~]#