| Name | Description | Type | Package | Framework |
| QualifiedParameterTypeVariableSubstitutor | TypeVariableSubstitutor that handles the qualifier parameter specific logic or combining TypeVariable uses with substituted types. | Class | org.checkerframework.qualframework.poly | Checker |
| QualifierParameterAnnotationConverter | An AnnotationConverter that can also find the names of all declared parameters on a class or method. | Interface | org.checkerframework.qualframework.poly | Checker |
| QualifierParameterChecker | QualifierParameterChecker extends Checker to configure QualifiedTypeFormatters specific to QualParams qualifiers. | Class | org.checkerframework.qualframework.poly | Checker |
| QualifierParameterHierarchy | This class provides a QualifierHierarchy implementation for sets of qualifier parameters. | Class | org.checkerframework.qualframework.poly | Checker |
| QualifierParameterTreeAnnotator | TreeAnnotator instance for qualifier parameter checkers. | Class | org.checkerframework.qualframework.poly | Checker |
| QualifierParameterTypeAnnotator | TypeAnnotator implementation for qualifier parameter checkers. | Class | org.checkerframework.qualframework.poly | Checker |
| QualifierParameterTypeFactory | Type factory with qualifier polymorphism support. | Class | org.checkerframework.qualframework.poly | Checker |
| QualParams | A map of qualifier parameters. | Class | org.checkerframework.qualframework.poly | Checker |
| Wildcard | When using SimpleQualifierParameterAnnotationConverter, this enum allows specifying super and extends bounds, e. | Class | org.checkerframework.qualframework.poly.qual | Checker |