centOS7 How to install jdk1.8

1. Create a new Java folder under /usr/local

mkdir /usr/local/java

Copy jdk to /usr/local/java into the java folder and unzip the package

tar xvf jdk-8u181-linux-x64.tar.gz

2, set the environment variable here to use the global setting method, is to modify etc/profile, it is the common environment variable for all users find /etc/profile, edit, add at the end

export JAVA_HOME=/usr/local/java/jdk1.8.0_181
export JRE_HOME=/usr/local/java/jdk1.8.0_181/jre
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib:$CLASSPATH
export PATH=$JAVA_HOME/bin:$PATH

During the above process, do not add Spaces to the equal sign, otherwise "not valid identifier" will appear, because source /etc/profile cannot recognize the extra Spaces, which will be interpreted as part of path 1.

And save it.

Run the following command for profile to take effect.

source /etc/profile

3. Check whether the terminal is successful

java -version
javac

conclusion