How do I add an object reference to an instance of an object. It seems that is the major issue here and not the code itself: ReDim Preserve items Sold (items Sold.Length)items Sold (items Sold. Length - 1) = newItemtotalSales += pricetotalItems += 1averageSale Price = totalSales / totalItems'Display the statisticslblTotalSales.Text = "Total Sales: " + totalblTotalItems.Text = "Total Items:11 + totalblAverageSale Price.Text = "Average Sale Prprice entered. Ple.seMessageBox.Show("Invalidnd IfException ThrownSystem.NullReference Exception: 'Object reference not set to aninstance of an object.'охShow Call Stack View Details Copy Details Start Live Share sessionException Settings✔Break when this exception type is thrownExcept when thrown from:Tag Sale.exeOpen Exception Settings Edit Conditions

The error "Object reference not set to an instance of an object" usually occurs when you try to…

se ReDim Preserve items Sold (items Sold.Length) itemsSold (items Sold. Length - 1) = newItem totalSales += price totalItems += 1 averageSale Price = totalSales / totalItems Display the statistics lblTotalSales.Text = "Total Sales: " + tota lblTotalItems.Text = "Total Items: " + tota lblAverageSale Price.Text = "Average Sale Pr price entered. Ple MessageBox.Show("Invalid Exception Thrown System.Null ReferenceException: 'Object reference not set to an instance of an object.' Show Call Stack View Details Copy Details Start Live Share session Exception Settings ✔Break when this exception type is thrown Except when thrown from: Tag Sale.exe Open Exception Settings Edit Conditions X

se ReDim Preserve items Sold (items Sold.Length) itemsSold (items Sold. Length - 1) = newItem totalSales += price totalItems += 1 averageSale Price = totalSales / totalItems Display the statistics lblTotalSales.Text = "Total Sales: " + tota lblTotalItems.Text = "Total Items: " + tota lblAverageSale Price.Text = "Average Sale Pr price entered. Ple MessageBox.Show("Invalid Exception Thrown System.Null ReferenceException: 'Object reference not set to an instance of an object.' Show Call Stack View Details Copy Details Start Live Share session Exception Settings ✔Break when this exception type is thrown Except when thrown from: Tag Sale.exe Open Exception Settings Edit Conditions X

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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use java (ArrayList, inheritance, polymorphism, File I/O and basic Java) Student class: First, you need to design, code in Java, test and document a base class, Student. The Student class will have the following information, and all of these should be defined as Private: A first name (given name) A last name (family name/surname) Student number (ID) – an integer number (of type long) The Student class will have at least the following constructors and methods: (i) two constructors - one without any parameters (the default constructor), and one with parameters to give initial values to all the instance variables of Student. (ii) only necessary set and get methods for a valid class design. (iii) a reportGrade method, which you have nothing to report here, you can just print to the screen a message “There is no grade here.”. This method will be overridden in the respective child classes. (iv) an equals method which compares two student objects and returns true if they…
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In java Define and create an array (called emps) of object references for objects of class Employee of length 100. (b) Create three objects for classes SalariedEmp, WeeklyEmp, and HourlyEmp (where these 3 classes are subclasses of class Employee); and with references e1, e2, e3 for the 3 objects:(c) Assign e1,e2, e3 to the first three elements of array emps:(d) Print the earnings of the 100 employee in the array emps in one loop (with polymorphism) where earnings are calculated with method earnings():
Help, I making a elevator simulator. I have to use polymorphism and object oriented programming to write this code. Can someone please help me improve this code I have. The remaining code is in the pictures. Any help is appreciated. Thank You! The simulation should have 4 types of Passengers: Standard: This is the most common type of passenger and has a request percentage of 70%. Standard passengers have no special requirements. VIP: This type of passenger has a request percentage of 10%. VIP passengers are given priority and are more likely to be picked up by express elevators. Freight: This type of passenger has a request percentage of 15%. Freight passengers have large items that need to be transported and are more likely to be picked up by freight elevators. Glass: This type of passenger has a request percentage of 5%. Glass passengers have fragile items that need to be transported and are more likely to be picked up by glass elevators. The simulation should also have 4 types…
Java- Suppose that Vehicle is a class and Car is a new class that extends Vehicle. Write a description of which kind of assignments are permitted between Car and Vehicle variables.
In java, can a polymorphic reference invoke a method that is only declared at the object's class level? If "yes", explain how.
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shows the complete anagram.cpp program. use a class to represent theword to be anagrammed. Member functions of the class allow the word to be displayed, anagrammed, and rotated. The main() routine gets a word from the user, creates a word object with this word as an argument to the constructor, and calls the anagram() member function to anagram the word.