Can a subclass member be overridden?

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. A subclass in a different package can only override the non-final methods declared public or protected.

Which methods Cannot be overridden in a subclass?

Can a subclass override inherited methods?

The ability of a subclass to override a method allows a class to inherit from a superclass whose behavior is "close enough" and then to modify behavior as needed. The overriding method has the same name, number and type of parameters, and return type as the method that it overrides.

What methods must be overridden in the subclass?

When a method in a subclass has the same name, same parameters or signature, and same return type(or sub-type) as a method in its super-class, then the method in the subclass is said to override the method in the super-class.

Which methods can be overridden?

Instance methods can be overridden only if they are inherited by the subclass. 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.

Overriding Superclass Methods in the Subclass

Can the subclass inherit static members?

No. Static members cannot be inherited. However super class and the sub class can have static method with same signature. Super class static member will be hidden at the sub class.

Which of the following Cannot be override?

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.

What can a subclass directly access?

Yes, a subclass has access to all nonprivate members of its superclass. 2. Create a subclass of TwoDShape called Circle. Include an area( ) method that computes the area of the circle and a constructor that uses super to initialize the TwoDShape portion.

What is the rule for overriding?

Instance methods can be overridden only if they are inherited by the subclass. 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.

What is it called when overriding is mandatory for a subclass?

If subclass (child class) has the same method as declared in the parent class, it is known as method overriding in Java. In other words, If a subclass provides the specific implementation of the method that has been declared by one of its parent class, it is known as method overriding.

Can private classes be overridden?

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 synchronized method be overridden?

For example, an overridden synchronized method's contract can be violated when a subclass provides an implementation that is unsafe for concurrent use. Such overriding can easily result in errors that are difficult to diagnose.

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.

Does a subclass inherit both fields and methods?

A subclass inherits all the members (fields, methods, and nested classes) from its superclass. Constructors are not members, so they are not inherited by subclasses, but the constructor of the superclass can be invoked from the subclass.

Can protected methods be overriden?

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.

How can a subclass method call an overridden superclass method?

The overridden method shall not be accessible from outside of the classes at all. But you can call it within the child class itself. to call a super class method from within a sub class you can use the super keyword.

Under what scenarios a method Cannot be overridden?

private, static and final methods cannot be overridden as they are local to the class. However static methods can be re-declared in the sub class, in this case the sub-class method would act differently and will have nothing to do with the same static method of parent class.

Can a subclass access the private members of its parent?

A subclass does not inherit the private members of its parent class. However, if the superclass has public or protected methods for accessing its private fields, these can also be used by the subclass.

Can subclasses access private variables of superclass?

Can you access a private variable from the superclass using the super keyword within the subclass? No. Private variables are only accessible to the class members where it belongs.

Do subclasses inherit constructors?

No a subclass cannot inherit the constructors of its superclass. Constructors are special function members of a class in that they are not inherited by the subclass. Constructors are used to give a valid state for an object at creation.

Which one of the following can be overridden?

Only the methods that are abstract, virtual or override can be overridden. Explanation: This is possible but only if the method to be overridden is marked as dynamic or virtual.

Can abstract method override?

A subclass must override all abstract methods of an abstract class. However, if the subclass is declared abstract, it's not mandatory to override abstract methods.

Can final methods be overloaded?

Can We Override a Final Method? No, the Methods that are declared as final cannot be Overridden or hidden.

Can a final class be inherited?

If a class is marked as final then no class can inherit any feature from the final class. You cannot extend a final class. If you try it gives you a compile time error.

Can we inherit or override static members?

No, we cannot override static methods because method overriding is based on dynamic binding at runtime and the static methods are bonded using static binding at compile time.