What is an instance of a class called? A. instance B. file C. library D. object
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What is an instance of a class called?
A. instance
B. file
C. library
D. object
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- For this exercise, you will create 2 classes: InputOutput class and AddNumbers class. ⦁ InputOutput Class: write a program that carries out the following tasks:⦁ Create an object of type PrintWriter and that writes into a file with the name greeting.txt.⦁ Print the message “Hello, world!” on the file.⦁ Close the file.⦁ Open the same file again.⦁ Read the message into a string variable (hint: use nextLine() method to read the text).⦁ Print the message on the screen. ⦁ AddNumbers Class: write a program that asks the user to input four floating-point numbers. Add all correctly specified values and print the sum when the user is done entering data. Use exception handling to detect improper inputs. For example, the user might enter letters instead of numbers. In this case, use the exception handling mechanism to print a proper message. (hint: use InputMismatchException) Don’t forget to import java.util.*.Output to a file can be achieved with a _____ object, which is constructed with a File and has the same methods as System.out (the class name is case sensitive)(Just Words)When I run this program these errors come up: error: duplicate class: classProg.Client class error: class Main is public, should be declared in a file named Main.java How do I fix it? package classProg; import java.util.Scanner; class Client { String name; int amount; Client(String name, int amount) { this.name = name; this.amount = amount; } public String toString() { return "\n Customer: \n" + name + " " + amount + " cents"; } } public class Main { Client client[]; static Scanner sc = new Scanner(System.in); int totalFifty, totalTen, totalFive; int currentIndex; Main(int no) { client = new Client[no]; currentIndex = 0; totalFifty = totalTen = totalFive = 0; } /** * Method to search a client name in the array of object * @param name - name to search * @return * If found returns the found index position * If not found returns -1 */ int findClient(String name) { for(int c = 0; c < currentIndex; c++) if(client[c].name.equalsIgnoreCase(name))…
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- Create a class called fun. Add to the class a static integer variable called count. Add a constructor that has count++; Add a function getCount() { return count ; } Instantiate 4 instance of the class. F1, F2, F3 and F4. Print out the value of count for each instance. What do you note about the static variable called count ? Filename: week6YourNameProgStaticedit and finish class authenticate below do not give a solution (example copying from another source and giving it as a solution) that is not part of my code below. Also provided is user class. This is what I have so far please help me finish it. The task is listed below //Authenticate.java import java.util.Scanner;import java.io.File; Class Authenticate {private final int SIZE = 100;private User() users = new User[SIZE];public Authenticator (String fileName) throws Exception;Scanner sc = new Scanner(new File(fileName));int i = 0;While(sc.hasNext() && i < SIZE) {users[i] = Users.read(sc);i++}} public void authenticate(String username, String password) throws Exception{try {User u = null;for(User X : users) {if(x.getUsername().equals(username) && x.verifyPassword(password){ return ; _________________________________________________________________ //User.java import java.io.File;import java.io.FileNotFoundException;import java.util.Scanner; public class User{private…Create 5 objects of class Product, input its product code, name and quantity and write into the FILE. Later, display the data of all objects by reading from the FILE till the end of the file. Also, check if any product has quantity zero? [
- Attached Files: File Items.txt (119 B) Imagine we were creating a Textbased Adventure program and our Rooms in the assignment above could hold Items. We are not writing the complete game, but lets write a program that will build the Item.txt file. Create a new project. Add a class called Item that stores information about an item that can be placed in a room. An item has a name, a description and the room number in which the item is initially is stored. LAMP, a brightly shining lamp, 3 is an example of data that an Item might contain. Using the UML model below, create the private data members and methods for constructing an item. Create an ItemFileWriter class with a static method to write the items from the given ArrayList to a text file.. The items text file will hold the item name, item description and the initial room that the item is to be loaded into, on seperate lines followed by a blank line. An example of the file that is to be constructed is attached. Construct a…public static void doSomething(String str) { System.out.println(str); } public static void main(String[] args) { try { Scanner fileHandler = new Scanner(new File("file.txt")); while(fileHandler.hasNext()) { doSomething(fileHandler.nextLine()); } }catch(IOException io) { // what happens if the file is not there?? } } Contents of file.txt are: Hello CS 1 I hope you are enjoying, yourself!Create a file named Validate.java , in that file create a method with the following signature: public static String getName(Scanner keyboard) Given a keyboard, make this method ask the user for a name. Ensure the name is between 5 and 15 characters. Return that name from this method. Write in java and use test case# as an examples