Can a .java file contain more than one java classes (or interfaces)?
Yes, a .java file can contain more than one java classes (or interfaces). But there are two restrictions:
- A .java source file can contain at most one top-level class (or interface) defined by the public modifier.
- The .java file name must be the same as the public class' (or interface's) name.
Even an empty .java file is a valid source file too.
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