install java 11 on ubuntu16

sudo apt-get install openjdk-11-jdk-headless

then check the folder /usr/lib/jvm/java-11-openjdk-amd64/bin

make sure java is inside, otherwise reinstall until it appears.

then

sudo update-alternatives --config java

(base) seamanj@seamanj-Blade:~$ sudo update-alternatives --config java
There are 2 choices for the alternative java (providing /usr/bin/java).
Selection
Path
Priority
Status
------------------------------------------------------------
* 0
/usr/lib/jvm/java-11-openjdk-amd64/bin/java
1111
auto mode
1
/usr/lib/jvm/java-11-openjdk-amd64/bin/java
1111
manual mode
2
/usr/lib/jvm/java-9-openjdk-amd64/bin/java
1091
manual mode
Press <enter> to keep the current choice[*], or type selection number:

最后

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