Which keyword is used to inherit a superclass into subclass? O a. extends O b. void O c. abstract O d. implements
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OOPs
In today's technology-driven world, computer programming skills are in high demand. The object-oriented programming (OOP) approach is very much useful while designing and maintaining software programs. Object-oriented programming (OOP) is a basic programming paradigm that almost every developer has used at some stage in their career.
Constructor
The easiest way to think of a constructor in object-oriented programming (OOP) languages is:
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- a. What is the concept of binding? Differentiate between early binding and late binding. (Write inmaximum 5 lines) [5 Marks]b. Write a Java operator/keyword, which can be used to check the validity of reference before attemptingdown-casting from superclass object to subclass reference. Given an example of it usage. (Write inmaximum 5 lines)Books can come in various formats, like paper books, audio books, ebooks, etc. Create a generic classBook that has as common attributes the title, the year of publication, and the author. The constructor of thisclass should instantiate all three attributes. Override the toString method of class Book that returns a stringthat contains the values of its attributes. Create a subclass PrintBook that extends Book with attributesPublisher and ISBN. Create another subclass AudioBook which has the book’s size (in MB), its playlength and the playback artist’s name as attributes. Both PrintBook and AudioBook classes override thetoString method inherited from Book. Write a Java application to demonstrate the usage of this hierarchy.IN JAVA Which is true? A. Private members can be accessed by a class user B. A mutator is also known as a getter method C. A mutator may change class fields D. An accessor is also known as a setter method
- If A and B are reference variables to the objects of MyClass, what can we say aboutthis comparison? (Pick all true statements.)if (A.equals(B)) {...} A. It is identity test.B. It checks whether two objects are equal if the equals method is overridden in MyClass.C. None is correct.D. It checks whether both are referring to the same object if the equals method is not overriddenin MyClass.If ParentClass is a Java class and we want the derived classes to have access to all the members of ParentClass, then we used the __?___ access specifier. a) public b) private c) protected d) inheritWhat key word is used to define a subclass from a super class? Write a Java statement that defines the subclass CSEFaculty class from the superclass CSEEmployee class (which is already defined)
- 14. Which statements are true about the following code? (Choose all that apply) 1: interface HasVocalCords {2: public abstract void makeSound();3: }4: public interface CanBark extends HasVocalCords {5: public void bark();6: } A. The CanBark interface doesn’t compile.B. A class that implements HasVocalCords must override the makeSound() method.C. A class that implements CanBark inherits both the makeSound() and bark() methods.D. A class that implements CanBark only inherits the bark() method.E. An interface cannot extend another interface. Can you explain this code as well as the methods such as interface abstract etc. used in it.14. Which statements are true about the following code? (Choose all that apply) 1: interface HasVocalCords {2: public abstract void makeSound();3: }4: public interface CanBark extends HasVocalCords {5: public void bark();6: } A. The CanBark interface doesn’t compile.B. A class that implements HasVocalCords must override the makeSound() method.C. A class that implements CanBark inherits both the makeSound() and bark() methods.D. A class that implements CanBark only inherits the bark() method.E. An interface cannot extend another interface. Please explain this code abstract, extent and interface methods too in detail.Assume that you write a class Student that does not have a declared superclass. You do not write a toString method. Consider the following lines of code:Student st = new Student();String s = st.toString();Will these lines compile? If so, what exactly will happen when you try to execute?
- Write a class named Employee which implements Comparable Interface with name and salary as data fields Add a constructor with argument name and salary. Add getter and Setter for name and salary. Add CompareTo() method for the data Salary. Write a class named Manager which inherits the Employee class. Add an instance variable, named department, of type String. Add a constructor in the subclass class with arguments name, salary, department and a toString() method that prints the manager’s name, department, and salary [Hint: Add a toString( ) method in the super class as well] Create 3 objects of Manager with following arguments 1. (Zayed, 500), 2. ( Ahmed, 700) 3. ( Faisal, 600) Add the above 3 objects into an ArrayLIst object and Sort by Salary and Display. Create an object Employee class with (Zayed, 500,IT) and display the 1. Name 2. Salary 3. Department by using tostring() method.IN JAVA Write a class Store which includes the attributes: store name, city. Write another class encapsulating an Art Gallery, which inherits from Store. An Art Gallery has the following additional attributes: how many paintings are sold every year and the number of artists submitting artwork. Code the constructor, accessors, mutators, toString and equals method of the super class Store. Code the constructor, accessors and mutators for the subclass Art Gallery. In the Art Gallery class, also code a method returning the average number of paintings per artist. You should create a test class which creates 2 Art Gallery objects, then calls your set methods, get methods, toString and equals methods and average paintings per artist for the Art Gallery objects.Will the following code segment compile? If not, indicate why. Assume the code for a proper implementation of the class exists. class myClass { public: void print(); //Output the value of val; myClass(); private: int val; }; int main () { myClass myObject; myObject.val = 10; }