How to set java environment variables

JAVA_HOME environment variable setting

First right-click [Computer] and enter [Properties] and then select [Advanced System Settings]

Click to enter [Environment Variables] in [Advanced] to enter the environment variable editing interface

Click [System Variables] below 】, the JAVA_HOME variable does not exist, then we need to click [New]

Variable name input: JAVA_HOME

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The variable value refers to the actual installation path (for example, the editor's path is: C:\Program Files\Java\jdk-9), and finally click OK.

PATH variable setting

Also in [System Variables] we can see that the path variable already exists, then we only need to click [Edit] to enter the path variable Edit

The variable name remains unchanged, the variable value is changed to [%JAVA_HOME%\bin;%JAVA_HOME%\jre\bin;], and finally click OK

Classpath variable setting: There is no need to set classpath after java1.5 version

Similarly, there is no Classpath variable in the system variables. Click to enter [New]

Type the variable name [Classpath]

Type the variable value [.;%JAVA_HOME%\lib\dt.jar;%JAVA_HOME %\lib\tools.jar; ]

Be careful not to miss the symbols in the variable value, and finally click OK

Test whether the configuration is successful

Similarly, search [cmd] in [Start], and then type [java] and [javac].

The message shown in the figure appears, indicating that the configuration is successful.

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