background:
Official website to download, the default installation path, as shown below, there are two folders java directory: jdk and jre:
1. Computer -> right click -> Properties -> left of 'Advanced System Settings'
2. Advanced System Settings -> Advanced -> Select 'Environment Variables'
3. Configuration Variables
(1) Configuration JAVA_HOME
System Variables -> New -> variable name: JAVA_HOME -> variable value: C: \ Program Files \ Java \ jdk1.8.0_211 -> determine the absolute path (variable value of jdk not jre absolute path, such as the beginning of FIG.)
(2) Configuration CLASSPATH
System Variables -> New -> variable name: CLASSPATH -> variable value:% JAVA_HOME% \ lib;% JAVA_HOME% \ lib \ tools.jar -> OK.
(3) Path Configuration
System Variables -> Variable Path Select -> after the variable value is added;% JAVA_HOME% \ bin;% JAVA_HOME% \ jre \ bin -> OK
4. Verify that the configuration is successful
Input cmd win + R
(1) input Java (screenshot section omitted)
(2) Enter the javac (screenshot section omitted)
(3) Input java -version
(1) - (3) shown above, it indicates that the configuration is successful jdk