Commonly used software installation

JDK8:

1. Download extract
2. Renamed jdk8
       mv -f jdk1.8.0_211 / jdk8
3. Modify the configuration
   vim / etc / Profile
   # add the following configuration
   

   export JAVA_HOME=/opt/jdk8
   export CLASSPATH=.:%JAVA_HOME%/lib/dt.jar:%JAVA_HOME%/lib/tools.jar
   export PATH=$PATH:$JAVA_HOME/bin

4. Refresh configuration
   source / etc / profile
5. Detection
   java -version

Oracle 11g：