'appletviewer' is not recognized as an internal or external command, operable program or batch file

问题

C:\Users\ms536\Desktop\java>appletviewer awt_ex.java 'appletviewer' is not recognized as an internal or external command, operable program or batch file.

回答1:

I can think of three possible explanations for this:

1. You may have not set the command search path ($PATH) correctly. This is a common for people who are new to Java; see javac is not recognized as an internal or external command, operable program or batch file

2. You may be trying to use appletviewer in Java 11 or later. This won't work. Applet support was deprecated in Java 9, and was removed entirely in Java 11; see https://bugs.java.com/bugdatabase/view_bug.do?bug_id=JDK-8200146.

3. You may have installed a JRE rather than a JDK. The appletviewer is (was) only available in JDK installations.

来源：https://stackoverflow.com/questions/54786830/appletviewer-is-not-recognized-as-an-internal-or-external-command-operable-pr