b. What happens if you run the above code in a main method without try-and-cat blocks? Try it out and add a screenshot. c. Give the code that reads the first 10 lines of the text file using the method nextLine().

b. What happens if you run the above code in a main method without try-and-cat blocks? Try it out and add a screenshot. c. Give the code that reads the first 10 lines of the text file using the method nextLine().

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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Instructions The history teacher at your school needs help in grading a True/False test. The students’ IDs and test answers are stored in a file. The first entry in the file contains answers to the test in the form:TFFTFFTTTTFFTFTFTFTTEvery other entry in the file is the student ID, followed by a blank, followed by the student’s responses. For example, the entry:ABC54301 TFTFTFTT TFTFTFFTTFTindicates that the student ID is ABC54301 and the answer to question 1 is True, the answer to question 2 is False, and so on. This student did not answer question 9. The exam has 20 questions, and the class has more than 150 students. Each correct answer is awarded two points, each wrong answer gets one point deducted, and no answer gets zero points. Write a program that processes the test data. The output should be the student’s ID, followed by the answers, followed by the test score, followed by the test grade. Assume the following grade scale:90%–100%, A; 80%–89.99%, B; 70%–79.99%, C; 60%–69.99%,…
create a class named FileUtils. Add a method static void copyFile(String source, String destination) method that copies the source file to the destination location. For example, if called as copyFile(“a.txt”, “b.txt”) the contents of the file “a.txt” would be copied into the file “b.txt.”a. You must write the code to copy the file using java.io.* classes (e.g. File, FileInputStream, FileOutputStream, etc.).b. Do not assume that the files will contain only text.c. You should try to copy efficiently (i.e. not a single byte at a time).d. It is suggested that you test your method by copying the provided files from the input directory to the output directory in your project.e. The method should rethrow any exceptions that may occur.
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.*.
JAVA Problem – CycleFileOutput Revisit the Cycle class. Modify your application such that the properties will be written to a text file called “Cycle.txt” instead of to the screen. 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). Use appropriate code to ensure that the text file exist. Output the values of the variables to the text file. Close the file. Note: Verify the contents were written to the text file using notepad (or any word processor). public class Cycle { // Declear integer instance variable private int numberOfWheels; private int weight; // Constructer declear class public Cycle(int numberOfWheels, int weight ) { this.numberOfWheels = numberOfWheels; this.weight = weight; } // String method for output public String toString() { String wheel = String.valueOf(this.numberOfWheels); String load =…
Instructions The history teacher at your school needs help in grading a True/False test. The students’ IDs and test answers are stored in a file. The first entry in the file contains answers to the test in the form:TFFTFFTTTTFFTFTFTFTTEvery other entry in the file is the student ID, followed by a blank, followed by the student’s responses. For example, the entry:ABC54301 TFTFTFTT TFTFTFFTTFTindicates that the student ID is ABC54301 and the answer to question 1 is True, the answer to question 2 is False, and so on. This student did not answer question 9. The exam has 20 questions, and the class has more than 150 students. Each correct answer is awarded two points, each wrong answer gets one point deducted, and no answer gets zero points. Write a program in C++ that processes the test data. The output should be the student’s ID, followed by the answers, followed by the test score, followed by the test grade. Assume the following grade scale:90%–100%, A; 80%–89.99%, B; 70%–79.99%, C;…
Implement (in Java) a console application for writing data to a sequential text file with a formatter class in Java : a. Implement createFile() method – To open/create a new file named as ‘mec.txt’ with explanations of the methods involved. b. Implement writeRecord() method – User enter the employee name, employee id, gross salary, tax rate, income tax and net salary from the keyboard and write/add these values to the file ‘mec.txt’ with explanations of the methods involved. The input fields must be validated as necessary. c. Implement closeFile() method – Close the file with explanations of the methods involved.
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.
The history teacher at your school needs help in grading a True/False test. The students’ IDs and test answers are stored in a file. The first entry in the file contains answers to the test in the form:TFFTFFTTTTFFTFTFTFTTEvery other entry in the file is the student ID, followed by a blank, followed by the student’s responses. For example, the entry:ABC54301 TFTFTFTT TFTFTFFTTFTindicates that the student ID is ABC54301 and the answer to question 1 is True, the answer to question 2 is False, and so on. This student did not answer question 9. The exam has 20 questions, and the class has more than 150 students. Each correct answer is awarded two points, each wrong answer gets one point deducted, and no answer gets zero points. Write a program that processes the test data. The output should be the student’s ID, followed by the answers, followed by the test score, followed by the test grade. Assume the following grade scale:90%–100%, A; 80%–89.99%, B; 70%–79.99%, C; 60%–69.99%, D; and…
you must create the data files with a text tool, such as Notepad exampleThree In the while loop, this program reads fileLoop.txt until all items are read package hasnext; import java.util.Scanner; import java.io.*; // public class Hasnext { public static void main(String[] args) throws IOException { File loopfile = new File("fileLoop.txt"); Scanner getAll = new Scanner( loopfile ); // connect a Scanner to the file int num = 0, square = 0; while(getAll.hasNextInt()) { num = getAll.nextInt(); square = num * num ; System.out.println("The square of " + num + " is " + square); } getAll.close(); } }
Part I Write a method that takes a celsius input from user and converts given value to other units of temperature, i.e. kelvin and fahrenheit. Part II Write a method that writes the given celsius input and its conversions to a file. Part III Write a method that reads the written temperature values from a file.
Computer Science Consider a look-up service for the television shows on a given date. A file contains information about these shows. Each show’s data appears on two lines. The first line gives the name of the station, the channel, the name of the show, and a rating. These entries are separated by tildes (~). The second line briefly describes the show. Write pseudocode for a method with the header public void readFile(Scanner data) to read the file into a dictionary that will be searched. Decide what data should be the search key and what should be the associated value. Design any classes needed for the key and the value. Write pseudocode for the method Do not write any code for the answer. Use UML, pseudocode, and written Description.
2. Complete the class code below and using only the main method, add code to make an EXACT COPY of the input file to an output file named copyOf_. For example, if we input the file named story.txt our class will make an exact copy of the file, but save it under the name copyof_story.txt public class CopyFile { public static void main(String[] args) { Scanner console = new Scanner(System.in); System.out.printIn("Enter name of the file to copy\nFileName --> "); // Your code here } } // end of CopyFile class