What should I do if the javac command prompts that the file cannot be found?

Cause one:

The suffix name of the java source file is wrong.

Solution:

Open the computer, select "Options" in "File" in the upper left corner and click;

(Video tutorial recommendation: java视频)

Select "View", find "Hide extensions for known file types" in "Advanced Settings", and click to remove the check mark.

Cause two:

The java source file and the current command are not in the same directory.

Solution:

If your Demo.java source file is under d:\ and the command line is under c:\, then you can execute the command: javac d:/Demo.java

Or enter the directory directly, type d:\, press Enter, and then execute the command: javac Demo.java. After compilation, execute the java Demo command to run.

Recommended tutorial: Getting started with java development

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