ew class named "Student" that must inherit from the given User class. This class manages student info: id (integer), name (string) and gpa (double). It must prevent the creation of a Student object with a negative ID or a GPA that is not between th

Inheritance, Polymorphism, ArrayLists, Throwing Exceptions The UML diagram below shows a set of classes designed to represent a music collection from 1995. The constructors and methods all function in the standard way, except: The equipmentRequired method should return "Record Player" or "CD Player" as appropriate.The getAlbum method of the NinetiesMusicCollection class accepts an index and returns the corresponding Album object. This method throws an IllegalArgumentException if the index is out of range. (This is the only exception you have to throw anywhere in your code.)In the NinetiesMusicCollection constructor, you can assume the ArrayList<Album> object passed as an argument is not null . Don’t worry about privacy leaks.Implement this set of classes in Java. Note the italics on the Class name "Album" and the method name "equipmentRequired" in the Album class.

in c++ Define another new class named "Item" that must inherit from the given Name class. This Item class will manage the following info: name (string) and price (double). It must prevent the creation of an Item object with either an empty or all-blank name. This class must at least complete the methods defined in the Name class: toString method returns a string representation of the Item object in the format of "ITEM( <name> ) PRICE($ <price> ) such as ITEM(eraser) PRICE(1ドル.05) contains method that accepts a search string and returns true if only the name of the item contains the search string as a substring. It returns false otherwise. isTheSame method that compares two Item objects and returns true only if both Item objects have the exact same name (regardless of the price) and false otherwise. Please note that if the given object in the parameter is not an Item object, it will return false.

Given this User class: class User { public: User(int id, string name) : m_id(id), m_name(name) {} int getId() const { return id; } string getName() const { return name; } virtual ~User() {} // You may also assume overloaded operator= and copy constructor. private: int m_id; string m_name; }; a) Create a data structure, UserStore (.h) to store User objects, with the following features: ●くろまる Method getUserById(int id), which returns the User with the given id, or nullptr if no such user exists. ●くろまる Method addUser(User user), which adds a new user to the store. ●くろまる Method visitUsers(void visit(User&)) to visit each User in the store, calling the provided "visit" method, which runs in O(n) time where n is the number of users in the store

Why might a class need to implement a destructor?

class IndexItem { public: virtual int count() = 0; virtual void display()= 0; };class Book : public IndexItem { private: string title; string author; public: Book(string title, string author): title(title), author(author){} virtual int count(){ return 1; } virtual void display(){ /* YOU DO NOT NEED TO IMPLEMENT THIS FUNCTION */ } };class Category: public IndexItem { private: /* fill in the private member variables for the Category class below */ ? int count; public: Category(string name, string code): name(name), code(code){} /* Implement the count function below. Consider the use of the function as depicted in main() */ ? /* Implement the add function which fills the category with contents below. Consider the use of the function as depicted in main() */ ? virtualvoiddisplay(){ /* YOU DO NOT NEED TO IMPLEMENT THIS FUNCTION */ } };