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Can a subclass override inherited methods?
A method declared final cannot be overridden. A method declared static cannot be overridden but can be re-declared. If a method cannot be inherited, then it cannot be overridden. A subclass within the same package as the instance’s superclass can override any superclass method that is not declared private or final.
Can the argument list of the method being overridden be different in the subclass?
Argument list: The argument list of overriding method (method of child class) must match the Overridden method(the method of parent class). Access Modifier of the overriding method (method of subclass) cannot be more restrictive than the overridden method of parent class.
Can we override final method in subclass?
Can We Override a Final Method? No, the Methods that are declared as final cannot be Overridden or hidden. Methods are declared final in java to prevent subclasses from Overriding them and changing their behavior, the reason this works is discussed at the end of this article.
Can we override private method in java?
1) In Java, inner Class is allowed to access private data members of outer class. 2) In Java, methods declared as private can never be overridden, they are in-fact bounded during compile time.
What is difference between method overloading and method overriding?
1. In the method overloading, methods or functions must have the same name and different signatures. Whereas in the method overriding, methods or functions must have the same name and same signatures. Whereas method overriding is done between parent class and child class methods.
How to override a method in a subclass in Java?
An instance method in a subclass with the same signature (name, plus the number and the type of its parameters) and return type as an instance method in the superclass overrides the superclass’s method.
Why is an overriding method not valid in Java?
An overriding method must fulfill the contract of the overridden method. If the overridden method accepts arguments of some class and you override it with a method that accepts only a subclass, it doesn’t fulfill the contract. That is why it is not valid.
When to use subtypes in an overriding method?
Your suggestion to accept that an overriding a method uses arguments that are subtypes of those requested by the overridden method is much more complicated since it leads to unsoundness in the type system. By one hand, by the same subtyping rules mentioned above, most likely it already works for what you want to do. For instance
Can a parameter be changed in a subclass?
As per the rule, while overriding a method in subclass, parameters cannot be changed and have to be the same as in the super class. What if we pass subclass of parameter while overriding method ?