Configure environment variables under WIN10

Prerequisites: Installing the Java JDK
System Variable--new

Variable name: java_home
The variable value is: C:\Program FILES\JAVA\JDK-9.0.1,JDK installation Address system variable--new

Variable name: CLASSPATH
The value of the variable is:.; %java_home%\lib\dt.jar;%java_home%\lib\tools.jar; System variable--Find--path

Click "Edit Text" to add%java_home%\bin and%java_home%\jre\bin to the C: directory, then click "OK"

Shortcut keys: win+r--cmd
Enter Java

Input Javac

Environment Configuration Successful