CentOS 7.7 two ways to install and configure JDK 11 LTS

1. Download JDK 11 LTS: https://www.oracle.com/technetwork/java/javase/downloads/jdk11-downloads-5066655.html

2. Install JDK 11 TLS:

# rpm-ivh jdk-11.0.6_linux-x64_bin.rpm

# java-version

Or

# tar-xf jdk-11.0.6_linux-x64_bin.tar.gz-C / usr/local

# cd / usr/local

# mv jdk-11.0.6/ jdk

Configure the JDK environment variable:

# vim / etc/profile.d/jdk11.sh

Export JAVA_HOME=/usr/local/jdk

Export JRE_HOME=$JAVA_HOME

Export CLASSPATH=.:$JAVA_HOME/lib

Export PATH=$JAVA_HOME/bin:$PATH

#. / etc/profile.d/jdk11.sh

# java-version

3. Select JDK 11 LTS as the default version among multiple JDK versions:

# alternatives-config java

Note: by default, only JDK 8 was previously installed using the rpm package.

# alternatives-install / usr/bin/java java / usr/local/jdk/bin/java 1

Remarks: alternatives [options]-- install link name path priority

# alternatives-config java