Which of the following statements regarding abstract class is not true? An abstract class cannot have constructors because an instance cannot be created for the class. An abstract class can be extended. A subclass of a non-abstract superclass can be abstract. None of the above.
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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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- Which of these is not a correct statement about abstract class? Every class containing abstract method must be declared abstract. Abstract class define only the structure of the class not its implementation Abstract class can be initiated by new operator Abstract class can be inheritedWhich (if any) of the following conditions are necessary for using polymorphism? Select all correct answers. The classes involved are in the same hierarchy. None of the classes can be abstract. All of the subclasses involved override the same method. The object reference cannot be of an interface type. An object reference of the superclass is used to call any methods. A superclass object is referenced by a subclass reference. Which of the following (if any) are true of abstract methods? Select all correct answers. Abstract methods must have a method body. Abstract methods cannot be declared in a class that isn't abstract itself. Abstract methods cannot be private or static. Abstract methods can only be declared in an interface. Abstract methods cannot be called. Constructor methods can be abstract.Which (if any) of the following conditions are necessary for using polymorphism? Select all correct answers. The classes involved are in the same hierarchy. None of the classes can be abstract. All of the subclasses involved override the same method. The object reference cannot be of an interface type. An object reference of the superclass is used to call any methods. A superclass object is referenced by a subclass reference. Which of the following (if any) are true of abstract methods? Select all correct answers. Abstract methods must have a method body. Abstract methods cannot be declared in a class that isn't abstract itself. Abstract methods cannot be private or static. Abstract methods can only be declared in an interface. Abstract methods cannot be called.
- When would you be most likely to use an abstract class? when you need to derive a class from Object when every method in the class is concrete when you need a super class that should not be instantiated when you need a super class that can be instantiated alongside the derived classes =========== Which UML symbol represents aggregation? a filled triangle an unfilled diamond an unfilled triangle a filled diamondQuestion 30 Which of the following description is TRUE? Inheritance allows us to define a class based on another class. Child classes receive all the features from the parent class but can NOT have their own additional features. Abstraction means that a method in a parent class can have a number of different implementations in child classes. An interface is a completely abstract class, which contains abstract properties, methods, and variables. The private access modifier makes members accessible only from within the class and hides them from the outside.Which of the following statements about abstract base classes is true? a. abstract base classes may contain data. b. abstract base classes may not contain implementations of methods. c. abstract base classes must declare all methods as abstract. d. abstract base classes must declare all data members not given values as abstract
- Which of the following statements are true. a) An abstract method contains a signature but no code implementation. b) We cannot create an instance of an abstract class by using the new operator. c) We can derive classes from an abstract class, but we must provide code to implement all of the abstract methods. d) All of the above statements are true.A is a parent class whereas B and C are subclasses of A. Now, B and Cshare some common attributes and some common methods, but there are somemethods in B and C that have very different implementations. Explain with reason whatA is going to be - a concrete class or an abstract class or an interface.Which of the following is true about abstract classes? Note that if a class can be sub-classed, this simply means that it can be derived from. Abstract classes can only contain abstract methods. They cannot be sub-classed. Abstract classes cannot be instantiated, but they can be sub-classed. Abstract classes can only contain abstract methods. They can be sub-classed. Abstract classes can be instantiated, but they cannot be sub-classed. Can an interface ever contain method bodies (i.e. content between {})? Unknown Yes No Sometimes
- In Java, which of the following is true about an abstract base class? no constructors should be provided at least one member function should be abstract no objects of the class can be created exactly two of the above91. Which of the following is true concerning the following statement:class Manager extends Employee a. Manager is a concrete class and a superclass. b. Manager is a concrete class and a subclass. c. Manager is an abstract class and a superclass. d. Manager is an abstract class and a subclass.Write the abstract super class Transaction, and two of its subclasses, Payment and Sale (you do not need to supply any comments other than your name). I. Write an abstract superclass encapsulating a Transaction: The Transaction super class has an instance variable representing the customers name, and 3 methods: an overloaded constructor, a toString() method that returns a message including the name of the customer, and an abstract method called calculateAmount()which will be implemented in your subclasses. II. Write a non-abstract subclass that inherits from the Transaction class encapsulating a Payment: The Payment class has instance variable representing the payment amount received and 3 methods. It has an overloaded constructor, a toString() method that returns a message including customers name, the name of the class Payment, and the payment amount, an non-abstract class called calculateAmount() which returns the payment amount. III. Write a second…