Question 20 For the next question, refer to the image below B ClassA +foo() void ClassX + foo(): void ClassB Given the following code snippet: ClassX a new ClassA(); ClassX b = new ClassB(); a. foo(); Whose method will be invoked in the function call (a.foo)? O ClassB's implementation of foo O None- results in an error O ClassA's implementation of foo ClassX's implementation of foo

Question 20 For the next question, refer to the image below B ClassA +foo() void ClassX + foo(): void ClassB Given the following code snippet: ClassX a new ClassA(); ClassX b = new ClassB(); a. foo(); Whose method will be invoked in the function call (a.foo)? O ClassB's implementation of foo O None- results in an error O ClassA's implementation of foo ClassX's implementation of foo

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Part (1) Define a class as follow: a. create a class called Student that has four instance variables - a (String) name, a (long) StudentID, a (String) College, and a (double) GPA. b. A constructor that takes student name, StudentID, College and GPA. The constructor sets the class variables to these values . c. Make the instance variable GPA private and provide a mutator method (set) and an accessor method (get) to access this variable. In set method if the GPA negative or grater than 4.00 print an invalid message and do not change the instance variable GPA. d. A method Student_Status () that check the GPA if it is less than 2, display the warning message, otherwise display Normal student. e. A method Print() that displays the name, StudentID, College and GPA of the student as shown below: Sample output: Enter the Student name: Ali Ahmed Enter the Student ID: 20180011 Enter the College: Information Technology Enter the GPA: 3.2 Normal student Name: Ali Ahmed Student ID: 20180011…
I need help based on the following question in the Screenshot 1)Given the following code snippet: Retraceable a = new ClassA();Retraceable b = new ClassB();a.retrace(); Whose method will be invoked in the function call a.foo()? Group of answer choices A)ClassB's implementation of retrace B)ClassA's implementation of retrace C)None - results in an error D)Retraceable's default implementation of retrace 2)Which of the following actions would be allowed? A)Creating an abstract class with implements Retraceable B)All of the given C)None of the given D)Adding additional methods to Class B
Part (1) Define a class as follow: a. create a class called Student that has four instance variables - a (String) name, a (long) StudentID, a (String) College, and a (double) GPA. b. A constructor that takes student name, StudentID, College and GPA. The constructor sets the class variables to these values . c. Make the instance variable GPA private and provide a mutator method (set) and an accessor method (get) to access this variable. In set method if the GPA negative or grater than 4.00 print an invalid message and do not change the instance variable GPA. d. A method Student_Status () that check the GPA if it is less than 2, display the warning message, otherwise display Normal student. e. A method Print() that displays the name, StudentiD, College and GPA of the student as shown below: Sample output: Enter the Student name: ALİ Ahmed Enter the Student ID: 20180011 Enter the College: Information Technology Enter the GPA: 3.2 Normal student Name: Ali Ahmed Student ID: 2018ee11…
QUESTION 7 Assume a Pet class contains a declaration for a method called getName () that returns a String. Later, we do this: public class Dog extends Pet{ ... How would we go about overriding this method in the new class? O We can only override this method if it is abstract in the Pet class O We must declare a method in the new class with the same method name and parameter list O We must first use the super () constructor to ensure that the name has a value We must declare a method in the new class with the same method name and return type QUESTION 8 Consider a linked list of nodes containing integer values. What it the run time associated with searching for a specific value in the list? O 0(1), because we can always access a specific node with an index O O(n), where n is the size of the list O(log n), if the list is in sorted order The length of the list is undefined, therefore the run time cannot be determined QUESTION 9 Given the following class definition: public class Car {…
Create a class for handling 3D coordinates (x,y,z) of type integer. Write down all ws2_p5. possible constructors for initialization and copying. By default (x-y%3Dz%3D0), at the time of initialization the user may omit any axis, should be considered as 0. Write the member functions to perform the addition and subtraction operations between two objects. (Use the pointers to handle the objects and use references while passing them between functions).
Quèstion 11 Match the following A. Public ycall a method in Java using primitive type parameters B. Encapsulation y call a method in Java using class type parameters c.Call-by-reference y methods are used to only change the value of an object's instance variables D. Overloading v modifier means that an instance variable or method cannot be accessed by name outside of the class E Immutable class E v combines the data and methods of a class into a single unit F Call-by-value G Mutator methods H. private
# objected oriented programming in Python I need the solution of all below python question codes along with correct return. # 1. Implement a class named "MyClass"# This class should have:# * During instantiation of this class, the 'some_val' parameter should be set as# a variable with the same name in the instance# * Implement the method called 'plus_n' that takes one parameter (named 'n'), such that# it should return the sum of instance's 'some_val' variable and 'n'class MyClass: def __init__(self, some_val): # your code goes here instead of pass pass def plus_n(self, n): # your code goes here instead of pass pass ########################################################################################################################################################################################################################################## # 2. Given two classes 'Animal' and 'DigestiveSystem, implement, using COMPOSITION the method…
Implement the Rectangle class as discussed this week. Use the class declaration below. Your job is to implement the functions. Implement the missing functions yourself. class Rectangle{ private: double width; double length; char *name; void initName(char *); public://constructorsRectangle();Rectangle(double, double, char*);//destructor ~Rectangle(); void setWidth(double); void setLength(double); void setWidth(char *); void setLength(char *); void setName(char *); double getWidth() const; double getLength() const; void printName() const { cout << name; }}; A few notes on the functions: initName(char *): this is a private member function. It should be the only function which dynamically allocates a char array to hold the name. setName(char *): this is a public member function which changes the name of the rectangle to a new name. It does not dynamically allocate memory, it only changes name. Demonstrate your class works…
QUESTION 4 Assume we have a class called Animals and within this class we have a method called toString(), and a derived class called Cats, which also has toString() method as below (note size is an attribute within the Cats class): public String toString( ) { return super.toString() + size; } in the main method, assume we create an object called Object from the class Cats, which instruction is correct to deal with toString() method O a. System.out.println(Object.toString()); O b. System.out.println(Object.toString().toString()); Oc. System.out.println(Object.Animals.toString()); O d. System.out.println(Animals.Object.toString());
1. Create a class Employee with parameters name, id, designation, and basicSalary. Use appropriate datatypes and access specifiers. Use default constructor to create objects of employee. Write methods toset and get the values of parameters of employee. Write methods to find total salary of employee andto display the complete details of employee along with total salary. Create another class TestEmployeewhich creates array of n number of employees, uses appropriate set methods to set the values ofparameters of every employee. Display the details of each employee. (Total salary = basic salary + 80%of basic salary)
What would be the possible situations that a copy constructor is activated? a. It can be called to construct a new object, just like any other constructor. b. It is also called when a value parameter is an object. c. It is call when a function returns an object. d. It is call when an object is destroyed. Group of answer choices a, b, and c a, b, c, ad d b and c a only a and b
Assume a Pet class contains a declaration for a method called getName () that returns a String. Later, we do this: public class Dog extends Pet{ .. How would we go about overriding this method in the new class? O We can only override this method if it is abstract in the Pet class O We must declare a method in the new class with the same method name and parameter list O We must first use the super () constructor to ensure that the name has a value O We must declare a method in the new class with the same method name and return type