how do I fix this error if I'm in java

Question

"Main.java:7: error: class Money is public, should be declared in a file named Money.java"

Answer 1

I can't see what you are trying to do, but from the error message only:

In Java, all public classes should be in a file with the same name as the class. So class Foo should be in Foo.java and class Money should be in Money.java.

Answer 2

You need to rename the file in which you have define the class named Money as Money.java .