Which of the following statements about constructors is correct: A constructor has the same name as the class name. A constructor is responsible for the initialization of an Constructor methods have no return type. A class can have several constructors. All of the above. Which of the following is an application of the principle of inheritance: An object of class A has a reference to a class B object. Several methods have the same name, but have different signatures. Objects created with new are allocated on the heap. Fields are usually declared private. All classes are ultimately derived from the super class called Object.

Which of the following statements about constructors is correct: A constructor has the same name as the class name. A constructor is responsible for the initialization of an Constructor methods have no return type. A class can have several constructors. All of the above. Which of the following is an application of the principle of inheritance: An object of class A has a reference to a class B object. Several methods have the same name, but have different signatures. Objects created with new are allocated on the heap. Fields are usually declared private. All classes are ultimately derived from the super class called Object.

Programming Logic & Design Comprehensive

9th Edition

ISBN:9781337669405

Author:FARRELL

Publisher:FARRELL

Chapter11: More Object-oriented Programming Concepts

Section: Chapter Questions

Problem 9RQ

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Which of the following statements are correct? (Select all that applies.) Group of answer choices a) Inheritance is the process by which one object can acquire the properties of another object. b) "super" is used to access the method or member variables from the parent class. c) Constructors are used to initialize a newly created object. d) Method overriding occurs when a child class declares a method that has the same type of arguments as a method declared by one of its parent classes. e) An object that has more than one form is referred to polymorphism.
Q.Which among the following is correct for the following code? class A{ public : class B { public : B(int i): data(i){ }int data;}};class C: public A{class D:public A::B{ };};i Multi-level inheritance is used, with nested classesii Multiple inheritance is used, with nested classesiii Single level inheritance is used, with enclosing classesiv Single level inheritance is used, with both enclosing and nested classes
6.Which among the following is correct for the following code? class A { public : class B { public : B(int i): data(i) { } int data; } }; class C: public A { class D:public A::B{ }; }; i Multi-level inheritance is used, with nested classes ii Multiple inheritance is used, with nested classes iii Single level inheritance is used, with enclosing classes iv Single level inheritance is used, with both enclosing and nested classes
Which one of a or b or c or d correct? Static methods and variables are created using the a)embedding convention b)keyword new c)constructor convention d)keyword static Non-static methods are a)able b)not able to access static variables directly. It makes a)a b)no difference whether the class has any instances since static entities are defined a)before the start b)as part of c)independently of the instantiation process.
Which of the following statements are false? (All that are not true). Group of answer choices A reference of type super class can refer to an instance of type subclass. A reference of type subclass can refer to an instance of type super class. A method in the super class can be overridden two different ways in two different subclasses. A method in the super class can be overridden by changing its signature in the subclass.
not handwritten Which of the following are NOT true for a constructor? Select one: a. It does not return anything b. Every class must include an explicitly written constructor c. Every field in the class is initialized in the constructor. d. It must have the same name as the class
Which of the following statements are true? Choose all options that apply.(a) Most superclasses are abstract.(b) Inheritance is preferable to composition.(c) Most superclasses are concrete.(d) Composition is preferable to inheritance.
Which among the following is correct for the following code? class A{ public : class B { public : B(int i): data(i){ }int data;}};class C: public A{class D:public A::B{ };};i Multi-level inheritance is used, with nested classesii Multiple inheritance is used, with nested classesiii Single level inheritance is used, with enclosing classesiv Single level inheritance is used, with both enclosing and nested classes
which of the following statements relating to information hiding in object-oriented programming is false? 1. Information hiding depends on the extensive use of global variable 2. Information hiding protects the value of variables from being changed inappropriately 3. Information hiding makes it easier for programmers to extend class without worrying about who may access the class properties/variable 4. Information hiding makes it easier for programmers to re-use classes without knowing the details of how they work internally.
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. 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.
For this portion of the assignment you will need to create the Employee class * based on the instructions in the API and have implemented the Equals method for that class. * * There is one parameter being passed as to this method that you will use as part of your solution:* An Employee object reference with the identifier testEmployee* * 1) Instantiate an instance of the Employee class using the default constructor and * assign it to an object reference with the identifier defaultEmployee* * 2) Instantiate an instance of the Employee class using the alternate constructor, * passing the following arguments:* name: "Keanu Reeves"* ID: 10010* salary: 78000.00* Assign the instance to an object reference with the identifier keanuEmployee* * 3) Declare a variable of type Employee with the identifier excellentEmployee and assign it * a reference to the same object that is being referenced by the keanuEmployee object reference. * 4) Construct a selection statement that tests if testEmployee is…