Define protected access modifier.Ī protected access modifier is accessible by own class and accessible by derived class but not accessible by the world. Whereas, Overriding is an OOPs concept that allows sub-classes to have a specific implementation of a method already provided by its parent class. Overloading is two or more methods having the same name but different parameters. What is the difference between overloading and overriding? Protected and private members in C++ are examples. What happens if both superclass and subclass have a field with the same name?Īns: Only subclass members are accessible if an object of subclass is instantiated.ģ1.The notion of data hiding is referred to as encapsulation. Can we access both superclass and subclass members if we create an object of subclass?Īns: Yes, we can access both superclass and subclass members.ģ0. Can we access subclass members if we create an object of superclass?Īns: No, we can access only superclass members but not the subclass members.Ģ9. They are only available in their own class.Ģ8. How will you restrict a member of a class from inheriting its subclass?Īns: We can restrict members of a class by declaring them private because the private members of superclass are not available to the subclass directly. It can be achieved through interfaces.Ģ7. What is Hybrid inheritance in java? How will you achieve it?Īns: A hybrid inheritance in java is a combination of single and multiple inheritance. A class cannot extend more than one class but a class can implement more than one interface.Ģ6. How does Multiple inheritance implement in Java?Īns: Multiple inheritance can be implemented in Java by using interfaces. Therefore, to reduce ambiguity, complexity, and confusion, Java does not support multiple inheritance through classes.įor more detail, go to this tutorial: Types of Inheritance in JavaĢ5. At most, one class can extend only one class. Multiple inheritance means that one class extends two superclasses or base classes but in Java, one class cannot extend more than one class simultaneously. Why multiple inheritance is not supported in java through class? In other words, when a class extends multiple classes, it is known as multiple inheritance.Ģ4. What is Multiple inheritance in Java?Īns: A class that has many superclasses is known as multiple inheritance. In single-level inheritance, we have just one base class and one derived class.Ī class which is extended by a class and that class is extended by another class forming chain inheritance is called multilevel inheritance.Ģ3. What is single inheritance and multi-level inheritance?Īns: When one class is extended by only one class, it is called single level inheritance. What are the various forms of inheritance available in Java?Īns: The various forms of inheritance to use are single inheritance, hierarchical inheritance, and multilevel inheritance.Ģ2. What are the types of inheritance in Java?Īns: The various types of inheritance are as follows:Ģ1. What are the advantages of inheritance in Java?Ģ0. Or, which keyword is used to inherit a class?ġ9. Which keyword do you use to define a subclass? What is order of calling constructors in case of inheritance?Īns: In case of inheritance, constructors are called from the top to down hierarchy.ġ8. Can we inherit private members of base class to its subclass?ġ7. Are static members inherited to subclass in Java?Īns: Static block cannot be inherited to its subclass.Ī static method of superclass is inherited to the subclass as a static member and non-static method is inherited as a non-static member only.Īns: No, a class declared with final keyword cannot be inherited.Īns: No, a final method cannot be overridden.ġ6. Are constructor and instance initialization block inherited to subclass?Īns: No, constructor and instance initialization block of the superclass cannot be inherited to its subclass but they are executed while creating an object of the subclass.ġ3. Can a class extend more than one class?Īns: No, one class can extend only a single class.ġ2. How will you prove that the features of Superclass are inherited in Subclass?Īns: Refer to this tutorial: Inheritance in Java with Realtime Exampleġ0. Which class in Java is superclass of every other class?Īns: In Java, Object class is the superclass of every other class.Ĩ. Where class and extends are two keywords.ħ. The syntax for declaring a subclass of class is as follows: class subclassName extends superclassName Ans: A subclass can be created by using the “extends” keyword.
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