[lex@localhost ~]$ sudo update-alternatives --config java

Обнаружено 3 программ(ы), предоставляющих «java».

  Выбор    Команда
-----------------------------------------------
   1           java-11-openjdk.x86_64 (/usr/lib/jvm/java-11-openjdk-11.0.2.7-0.fc29.x86_64/bin/java)
*+ 2           java-1.8.0-openjdk.x86_64 (/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.201.b09-2.fc29.x86_64/jre/bin/java)
   3           java-openjdk.x86_64 (/usr/lib/jvm/java-11-openjdk-11.0.1.13-11.rolling.fc29.x86_64/bin/java)

Enter - сохранить текущий выбор[+], или укажите номер: ^C

[lex@localhost ~]$ which java
/usr/bin/java

[lex@localhost ~]$ file /usr/bin/java
/usr/bin/java: symbolic link to /etc/alternatives/java

[lex@localhost ~]$ file /etc/alternatives/java
/etc/alternatives/java: symbolic link to /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.201.b09-2.fc29.x86_64/jre/bin/java

[lex@localhost ~]$ ls /usr/lib/jvm
java                                              java-openjdk                                     jre-1.8.0
java-11-openjdk-11.0.1.13-11.rolling.fc29.x86_64  jre                                              jre-1.8.0-openjdk
java-11-openjdk-11.0.2.7-0.fc29.x86_64            jre-11                                           jre-1.8.0-openjdk-1.8.0.201.b09-2.fc29.x86_64
java-1.8.0                                        jre-11-openjdk                                   jre-openjdk
java-1.8.0-openjdk                                jre-11-openjdk-11.0.1.13-11.rolling.fc29.x86_64
java-1.8.0-openjdk-1.8.0.201.b09-2.fc29.x86_64    jre-11-openjdk-11.0.2.7-0.fc29.x86_64

[lex@localhost ~]$ file /usr/lib/jvm/java
/usr/lib/jvm/java: symbolic link to /etc/alternatives/java_sdk

[lex@localhost ~]$ file /etc/alternatives/java_sdk
/etc/alternatives/java_sdk: symbolic link to /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.201.b09-2.fc29.x86_64