yaoweibin@ubuntu:~$ sudo apt install default-jdk-headless
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following NEW packages will be installed:
default-jdk-headless
0 upgraded, 1 newly installed, 0 to remove and 102 not upgraded.
Need to get 1132 B of archives.
After this operation, 6144 B of additional disk space will be used.
Get:1 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 default-jdk-headless amd64 2:1.11-68ubuntu1~18.04.1 [1132 B]
Fetched 1132 B in 2s (676 B/s)
Selecting previously unselected package default-jdk-headless.
(Reading database ... 30061 files and directories currently installed.)
Preparing to unpack .../default-jdk-headless_2%3a1.11-68ubuntu1~18.04.1_amd64.deb ...
Unpacking default-jdk-headless (2:1.11-68ubuntu1~18.04.1) ...
Setting up default-jdk-headless (2:1.11-68ubuntu1~18.04.1) ...
yaoweibin@ubuntu:~$
为了验证Java是否成功安装，请执行以下命令：
java -version
yaoweibin@ubuntu:~$ java -version
openjdk version "11.0.7" 2020-04-14
OpenJDK Runtime Environment (build 11.0.7+10-post-Ubuntu-2ubuntu218.04)
OpenJDK 64-Bit Server VM (build 11.0.7+10-post-Ubuntu-2ubuntu218.04, mixed mode, sharing)
yaoweibin@ubuntu:~$
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