No Empty Class Bodies
ID |
kotlin.no_empty_class_bodies |
Severity |
info |
Remediation Complexity |
medium |
Remediation Risk |
low |
Remediation Effort |
medium |
Resource |
Code Smell |
Language |
Kotlin |
Tags |
best-practice, code-style |
Description
Reports class, interface, object, or companion-object declarations whose body is
present but empty (class Foo {}). When a class body contains no members, the
braces are redundant and should be removed.
Rationale
Kotlin allows class Foo without braces when there are no members. The brace-free
form is shorter, unambiguous, and idiomatic. An empty {} suggests either a
placeholder that was never completed or a copy-paste leftover.
// Bad
class Empty {}
object Config {}
interface Marker {}
// Good
class Empty
object Config
interface MarkerRemediation
Remove the empty braces. Most IDEs offer a one-click inspection fix. If the empty body is intentional (e.g. a future extension point), add a comment inside the braces to document the intent and suppress the warning:
class ExtensionPoint {
// reserved for future use
}