Answered: What is the difference between a…

Engineering

Computer Science

What is the difference between a synchronized method and a synchronized block

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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Consider the following C++ class: class myFile { public: myFile(const char *fname); myFile(); void print(); }; An object of this class opens a file and keeps it open, method print() prints that file's content to cout, while the constructor closes the file. Provide a complete implementation for this class. Feel free to add data members as you see fit. The constructor must throw an exception if the file cannot be open for reading. Your function main() must provide proper exception handling.
Context: I made a program that allowed the user to play TOWERS OF HANOI. user can perid the amount of discs to play and do the movements. HANOI game: It consists of a game of 3 towers and discs. The objective is to pass the disks from a source tower to a destination tower. The problem I have is that the game always starts in Tower 1. I would like you to help me modify the method I have to START THE GAME: When I run it, it always starts in tower 1. I would like the method to start in the tower that the user says. also that he says which tower he wants to finish. Example: I want the game to start in tower 2 and end in tower 1 and validate that the game is over. I HAVE ALL THE GAME MADE. the problem lies in what has been said above. METHOD TO MODIFY SO that the user requests (ORIGIN Tower, DESTINATION Tower and validate if I win the game.) /// public static void Start_hanoi(){ // REQUEST NUMBER OF DISCS System.out.println("Write the number of disks to process: ");ndisk =…
Write a C# program named Averages that includes a method named Average that accepts any number of numeric parameters, displays them, and displays their average. For example, if 7 and 4 were passed to the method, the output would be: 7 4 -- Average is 5.5 Test your function in your Main(). Tests will be run against Average() to determine that it works correctly when passed one, two, or three numbers, or an array of numbers.
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Write a C#program that uses a class called ClassRegistration as outlined below: The ClassRegistration class is responsible for keeping track of the student id numbers for students that register for a particular class. Each class has a maximum number of students that it can accommodate. Responsibilities of the ClassRegistration class: It is responsible for storing the student id numbers for a particular class (in an array of integers) It is responsible for adding new student id numbers to this list (returns boolean) It is responsible for checking if a student id is in the list (returns a boolean) It is responsible for getting a list of all students in the class (returns a string). It is responsible for returning the number of students registered for the class (returns an integer) It is responsible for returning the maximum number of students the class is allowed (returns an integer) It is responsible for returning the name of the class. (returns a string) ClassRegistration -…
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A binary operator is an operation that is performed on two operands. For example, addition is a binary operator that adds two operands (e.g., 2 + 4). In the provided UML diagram, all binary operators have two operands and an execute method that performs the appropriate operation on the operands. The AddOperation class should add the two operands. The SubtractOperation class should subtract the two operands. Here is an example of how a binary operator could be used: IBinaryOperator operator = new AddOperator(8, 12);System.out.println(operator.execute()); // should print 20operator.setLeftOperand(18);System.out.println(operation.execute()); // should print 30 crate a Main.java to test your code
Exception in thread "main" java.lang.NumberFormatException: For input string: "x" for Java code public class Finder { //Write two recursive functions, both of which will parse any length string that consists of digits and numbers. Both functions //should be in the same class and have the following signatures. //use the if/else statement , Find the base case and -1 till you get to base case //recursive function that adds up the digits in the String publicstaticint sumIt(String s) { //if String length is less or equal to 1 retrun 1. if (s.length()<= 1){ return Integer.parseInt(s); }else{ //use Integer.praseInt(s) to convert string to Integer //returns the interger values //else if the CharAt(value in index at 0 = 1) is not equal to the last vaule in the string else {//return the numeric values of a char value + call the SumIt method with a substring = 1 return Character.getNumericValue(s.charAt(0) ) + sumIt(s.substring(1)); } } //write a recursion function that will find…
6. Design a Java class with a main method that does the following. You must include a meaningful comment for main and each method a. Main invokes a method readScores to read input from a file (name of your choice) that contains the name of the bowlers (no more than 25) and their bowling scores (two scores per bowler). The program stops reading values when it has reached the end of the file. For example, the file might contain: Bob 203 176 Jane 210 253 Jack 300 189 Eileen 220 298 • As the method reads the data, it stores the name into a String array and the average of the two bowling scores into an array of double. • The method returns the actual number of bowlers read in b. Main then invokes a method computeOverallAvg to: compute (a) the overall average score of all the bowlers combined, (b) the average score and name of the bowler with the highest average score and (c) the average score and name of the bowler with the lowest average scores. print to the console (a) the overall average…
Using python: (see attached- I need help with part Q2) Add a method to the person class name it (username) that takes the email and take off all the part from @ and after, and assigns the string before the @ sign to a variable username. For example: malabdullah@UT.edu, the method will assign 'malabdullah' as the username.
Please answer in python Write a method called add_racer which takes in a Boat object and adds it to the end of the racers list. The function does not return anything. Write a method called print_racers which loops through racers and prints the Boat objects. This function takes in no parameters (other than self) and returns nothing. Write a method called count that returns the number of racers. Write a method called race. The race function calls the move function for all of the racers in the BoatRace. Once all the racers have moved, call the print_racers method to display information about the progress of each boat. Then, check if any of the racer’s current_progress is greater than or equal to the race’s distance. If so, then return a list of all of the racers whose current_progress is greater than or equal to distance. If no racer has finished the race then repeat the calls to move and check until at least one racer has finished the race. Examples: Copy the following if…