Linux Centos 7 configuration jdk

1. Unzip command: tar -zxvf jdk-8u211-linux-x64.tar.gz

2. Create a soft link (can be omitted): ln -s jdk1.8.0_211/ jdk_current

3. Editing system environment variables:vi /etc/profile [A start editing]

4. Join as follows:

   export JAVA_HOME=/home/ryan/app/jdk_current
   export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
   export PATH=$JAVA_HOME/bin:$PATH
   注意标点符号，JAVA_HOME是jdk的路径
   

5. Just set the variable load
   source /etc/profile

6. Test whether the installation is successful
   - then enter java -version displays the version information jdk, etc.
   - input javac javac command will display this help and jdk environment variable configuration succeeded
   [ryan@localhost app]$ java -version
java version "1.8.0_211"
Java(TM) SE Runtime Environment (build 1.8.0_211-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.211-b12, mixed mode)
[ryan@localhost app]$ javac -version
javac 1.8.0_211

7. Note : each boot must source profile