Answered: Instead of making a class Serializable,…

Instead of making a class Serializable, the developer can write each of the member variables to a file. This process takes longer and requires more code. True False

EBK JAVA PROGRAMMING

9th Edition

ISBN:9781337671385

Author:FARRELL

Publisher:FARRELL

Chapter3: Using Methods, Classes, And Objects

Section: Chapter Questions

Problem 2GZ

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Write a class name FileDisplay with the following methods: Constructor: takes the name of a file as an argument displayHead: displays only the first five lines of the file’s contents. If the file contains less than 5 lines, it should display the file’s entire contents. displayContents: displays the entire contents of the file, the name of which was passed to the constructor. writeNew: displays the contents of a file, the name of which was passed to the constructor. Each line should be preceded with a line number followed by a colon. The line numbering should start at 1. As each line is displayed it should also be written to a new file, the name of which is passed in as a parameter. I have provided a test file called “testfile.txt”. I have also provided a driver for the application called “filedisplaytest.java”. This file is complete and should not be altered. Test File: This is line one.This is line two.This is line three.This is line four.This is line five.This is line…
CODE IN JAVA Write a class name FileDisplay with the following methods: Constructor: takes the name of a file as an argument displayHead: displays only the first five lines of the file’s contents. If the file contains less than 5 lines, it should display the file’s entire contents. displayContents: displays the entire contents of the file, the name of which was passed to the constructor.writeNew: displays the contents of a file, the name of which was passed to the constructor. Each line should be preceded with a line number followed by a colon. The line numbering should start at 1. As each line is displayed it should also be written to a new file, the name of which is passed in as a parameter. I have provided a test file called “testfile.txt”. I have also provided a driver for the application called “filedisplaytest.java”. This file is complete and should not be altered. FILEDISPLAYTEST.JAVA (do not change this) import java.io.*; public class FileDisplayTest {…
The file Names.txt is located in the folder input_files within your project. The content of that file is shown in the following figure Java: import java.io.FileInputStream;import java.io.FileNotFoundException;import java.util.ArrayList;import java.util.Scanner;public class Question2 {public static void main(String[] args) throws FileNotFoundException {/*** Part a* Finish creating an ArrayList called NameList that stores the names in the file Names.txt.*/ArrayList<String> NameList;/*** Part b* Replace null on the right-hand-side of the declaration of the FileInputStream object named inputStream* so that it is initialized correctly to the Names.txt file located in the folder specified in the question description*/FileInputStream inputStream = null;Scanner scnr = new Scanner(inputStream); //Do not modify this line of code/*** Part c* Using a loop and the Scanner object provided, read the names from Names.txt* and store them in NameList created in Part a.*//*** Part d* Reorder the…
Programming Problem 3 – CycleFileInput Revisit the Cycle class in Module 3. Modify your application such that the properties will be read from a text file called “Cycle.txt”. Directions Examine your application for the class called Cycle. Add an appropriate throws statement in the main method. Create a reference to a File class with the appropriate name of a text file (Cycle.txt). Note: Cycle.txt was created in the previous assignment, CycleFileOutput. In your code, check that the text file does exist. Input the values from the file to memory. Close the file.
// This file defines the Building class// and the Hotel class that inherits from it.// A demonstration program declares and uses a Hotel object.class Building Declarations private string streetAddress private num squareFeet public string getAddress() return streetAddress public void getSquareFeet() return squareFt public void setSquareFeet() squareFeet = feet return public void setStreetAddress(string address) address = streetAddress returnendClass class Hotel inheritsFrom Building Declarations private num numberOfRooms public Hotel(string address, num sqFt, num rooms) streetAddress = address squareFeet = sqFt numberOfRooms = rooms return public num getNumberOfRooms return roomsendClass start Declarations Hotel hotel("100 Main Street", 8000, 20) output getAddress(), getSquareFeet(), getNumberOfRooms()stop
Computer Science In java design 2 classes, one where you design a Car object with 3 features, doors, windows and seats. Include one toString method that returns how much you have for each feature. This is NOT serializable, the file is .txt In the second class, create a client class, where you have an existing file, which already has 2 car objects in it, delete the second line with the car object, so there is only 1 and then write in the file 4 car objects from the Arraylist. DO NOT use colons ":" in your work . Explain all steps of your work and display an output. Don't use buffer reader or file reader. Use Scanner when reading a file, below are the imports you can use, YOU can also use any type of error message import java.io.FileWriter;import java.io.IOException;import java.io.PrintWriter; import java.util.Scanner here is a example of scanner if needed Scanner file = new Scanner( new File("flights.txt" ) );
InputOutput Class: write a program that carries out the following tasks: o Create an object of type PrintWriter and that writes into a file with the name greeting.txt. o Print the message "Hello, world!" on the file. o Close the file. o Open the same file again. o Read the message into a string variable (hint: use nextLine() method to read the text). o 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.*.
In Java, every source file must have the same name as the class declared in the file. Select one: True False
True or False: Object privileges allow you to add and drop users
Write a class FileConverter with a constructor that accepts a String file name as its argument. It should store filename as its attribute (with a accessor getFilename(). The class should have the following methods: • createUpperCaseFile(): Accepts a String parameter targetFilename. It will open up both the file specified in class attribute filename and the method parameter targetFilename. Then it will convert all lines of the class attribute filename to upper case and write it to target file, line by line. • createRowCharCountFile(): Accepts a String parameter targetFilename. It will open up both the file specified in class attribute filename and the method parameter targetFilename. Then it will count the number of chars in each line of the class attribute filename and write it to target file line by line. The class must come with a main() method, which will create an object instance and generate two target files based on the source file, one all upper case, and another row char count.
IN JAVA Description A teacher has five students who have taken four tests. The teacher uses the following grading scale to assign a letter grade to a student, based on the average of his or her four test scores. Test Score Letter Grade 90-100 A 80-89 B 70-79 C 60-69 D 0-59 F The student and score data are stored in the given file StudentInfo.txt. Create a class named GradeBook in a file named GradeBook.java. The class GradeBook is required to use a String array to hold the five students’ names, an array of five characters to hold the five students’ letter grades, and five arrays of four doubles each to hold each student’s set of test scores. The class should have methods that return a specific student’s name, average test score, and a letter grade based on the average. The program that demonstrates the class GradeBook is given in the file GradeBookDemo.java. You are required to read and understand the given program, and make the program…
ga Class in Python Creating a Class in Python MyRectangleClassPro. Rectangle.py 1 # This program uses the programmer-defined Rectangle class. 2 Summary 3 # Do NOT modify this program. Write your code in Rectangle.py, 4 # then select this file and click "Run Code". In this lab, you create a programmer-defined class and then use it in a Python program. The 5 program should create two Rectangle objects and find their area and perimeter. 6 from Rectangle import Rectangle 7 8 rectanglel = Rectangle(10.0, 5.0) 9 rectangle2 = Rectangle(7.0, 3.0) Instructions 10 1. Open the class file named Rectangle.py 11 print("Perimeter of rectanglel is " + str(rectanglel.calculatePerimeter())) 12 print("Area of rectanglel is " + str(rectanglel.calculateArea())) 13 print("Perimeter of rectangle2 is " + str(rectangle2.calculatePerimeter())) 14 print("Area of rectangle2 is " + str(rectangle2.calculateArea())) 2. In the Rectangle class, create two attributes named length and width . 3. Write a public…