Can we overload overridden method in Java?
Yes, we can override a method which is overloaded in super class.
Why overridden method should not be more restrictive?
You can not make access modifier more restrictive, because that would violate the basic rule of inheritance that a subclass instance should be replacable in place of a superclass instance. For e.g Suppose that Person class has getName public method which is being used by many classes(including non-sub classes).
What are the restrictions when overriding a method?
Answer: Overriding methods must have the same name, parameter list, and same return type. i.e., they must have the exact signature of the method we are going to override, including return type.
Why overriding is used in Java?
The benefit of overriding is: ability to define a behavior that’s specific to the subclass type, which means a subclass can implement a parent class method based on its requirement. In object-oriented terms, overriding means to override the functionality of an existing method.
Can we override the private method?
No, we cannot override private or static methods in Java. Private methods in Java are not visible to any other class which limits their scope to the class in which they are declared.
Can constructor be overridden?
Constructor looks like method but it is not. It does not have a return type and its name is same as the class name. But, a constructor cannot be overridden. If you try to write a super class’s constructor in the sub class compiler treats it as a method and expects a return type and generates a compile time error.
Can you reduce scope of overriding method?
Yes, an overridden method can have a different access modifier but it cannot lower the access scope. Methods declared public in a superclass also must be public in all subclasses. Methods declared protected in a superclass must either be protected or public in subclasses; they cannot be private.
Can we override protected method as private?
Yes, the protected method of a superclass can be overridden by a subclass. If the superclass method is protected, the subclass overridden method can have protected or public (but not default or private) which means the subclass overridden method can not have a weaker access specifier.
What methods Cannot be overridden in Java?
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 final methods be overridden?
Final methods cannot be overridden because the purpose of the “final” keyword is to prevent overriding.
What are the rules for overriding a method in Java?
Rules for Java method overriding. Following are the rules we should consider while overriding a method properly: ● The argument list should be exactly the same as that of the overridden method. ● The return type should be the same or a subtype of the return type declared in the original overridden method in the superclass.
Is overriding an inheritance in Java?
Also, Overriding in Java extends itself to get the parent class features by an IS-A relationship and therefore is termed as an inheritance.
In object-oriented terms, overriding means to override the functionality of an existing method. Let us look at an example. This will produce the following result −
What is overriding and access-modifiers in Java?
Overriding and Access-Modifiers : The access modifier for an overriding method can allow more, but not less, access than the overridden method. For example, a protected instance method in the super-class can be made public, but not private, in the subclass.