Java: Covariant Return Type — a demo & definition
Returning a covariant type is the return of a subclass within an overridden method. An overridden method can only be defined in a subclass which is not related to the returned subclass. Methods can also return interfaces.
// Return type classes: class SuperClass { } class SubClass extends SuperClass {
} // Classes demonstrating the covariant return type: class NotRelatedSuperClass { SuperClass getInstance() { return new SuperClass(); } } class NotRelatedSubClass extends NotRelatedSuperClass {
SubClass getInstance() { return new SubClass(); } }
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