Default Class Accessibility
The answer differs between Java and C#. In Java, a top-level class with no modifier has package-private accessibility, meaning it is accessible only within the same package. A nested Java class follows member access rules. In C#, a top-level class defaults to internal accessibility, while a nested class defaults to private when no access modifier is specified. This distinction is important when designing module and assembly boundaries.
Java top-level class without a modifier: package-private.
C# top-level class without a modifier: internal.
Java and C# have different defaults for nested types.
Explicit visibility is often preferable for public APIs because it makes intent clear.
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