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Java is case sensitive. Be sure to spell the class name the same everywhere you use it.
Try this. The class name without the extension:
java VolcanoApplication


It's important that you post all...

What happens when you try to compile VolcanoRobot?
Are either of the classes in packages?
What is the command you use to compile the source files with? Does it set the classpath if the source files...

The compiler can NOT find the definition for class VolcanoRobot.
Where is it?

The = makes what is in the () an assignment statement vs the concatenation of a variable to a String. The compiler complains that the String to the left of the = is a value not a variable. Normally...

Please copy and paste here the full text of the error messages you get. Its easier to work with the data all here vs images.

To copy the contents of the command prompt window:
Click on Icon in...