1. To successfully configure Java environment variables, it is necessary to install the JDK in order to start the configuration. After the successful installation, the test is really successful installation, click "Start"----"Run"----input CMD, enter "Java-version" at the command prompt and press ENTER to display the Java version information.
2. Start configuring environment variables, right-click on "My Computer"---"Properties"-----"advanced"---"Environment variables", select "New System Variable"--Popup "New System Variable" dialog box, enter "Java_home" in "Variable name" text box, "Variable Value" text box enter the installation path for the JDK.
3. View the path variable in the system Variables options area, and if it does not exist, create a new variable path, otherwise select the variable, click the Edit button, and add "%java_home%\bin;%java_home%\jre\bin;" At the beginning of the Variable Value text box. Or a direct "%java_home%\bin;"
4. View the CLASSPATH variable in the system Variables options area, and if it does not exist, create a new variable classpath, otherwise select the variable, click the Edit button, and add "at the beginning of the Variable Value text box."; %java_home%\lib\dt.jar;%java_home%\lib\tools.jar; ".
5. Now the test environment variable is configured successfully or not. Enter "JAVAC" in the DOS command line window and the output Help information is configured correctly.
Java environment variable Configuration