How does Java achieve polymorphism?

In Java, polymorphism is implemented through inheritance and method overriding. This means that when a subclass inherits from a superclass and overrides a method of the superclass, the superclass reference can point to an object of the subclass and call the overridden method. Depending on the type of reference being used, the actual method called will be determined dynamically based on the object’s actual type, thereby achieving polymorphism.