Write the code to print each token. 5) What is the return type of the method nextToken( ). 6) Suppose to want to peel off the next token for a double price. Write the line of code to do this: double value; Topic: writing and use of a copy constructor 1) What is the purpose of a copy constructor? 2) Write the code for a copy constructor for the Student class described above. 3) What is the difference between a deep copy and a shallow copy when writing a copy constructor? Topic: returning an object reference from a method 1) What is the return type from this method: public Fraction add(Fraction addend) 2) What is the parameter to this method: public Fraction add(Fraction addend) Topic: aggregation 1) What type of relationship is aggregation? 2) A class can only have primitive fields. True or false 3) Write a short class definition of a class using aggregation. Only declare the fields and write the constructor and the toString( ) methods.

Write the code to print each token. 5) What is the return type of the method nextToken( ). 6) Suppose to want to peel off the next token for a double price. Write the line of code to do this: double value; Topic: writing and use of a copy constructor 1) What is the purpose of a copy constructor? 2) Write the code for a copy constructor for the Student class described above. 3) What is the difference between a deep copy and a shallow copy when writing a copy constructor? Topic: returning an object reference from a method 1) What is the return type from this method: public Fraction add(Fraction addend) 2) What is the parameter to this method: public Fraction add(Fraction addend) Topic: aggregation 1) What type of relationship is aggregation? 2) A class can only have primitive fields. True or false 3) Write a short class definition of a class using aggregation. Only declare the fields and write the constructor and the toString( ) methods.

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

See similar textbooks

Similar questions

Answer with True or False for the following. Explain your answers.-It is legal to write a method in a class which overloads another method declared in the same.-It is legal to write a method in a superclass which overrides a method declared in a sub-class.
Java Programming problem Create a checking account class with three attributes: account number, owner’s name, and balance. Create constructor, getters and setters. If one is to set the initial balance of an account as a negative value in a setter or a constructor, remind the user about the error and set it as 0. Create a CheckingAccountDemo class, and create a main method in which Ask for the name, account number, and initial balance for one account from the keyboard input. With these input values as arguments in a call to the constructor, create a CheckingAccount object. Print the summary of this account that includes information on the name, account number, and balance by calling the getters.
Define a class called Country. A Country has populationSize, area, capital, currency, and abbreviation (2-3 letters taken from the country name). Define at least two constructors, at least two getter methods, at least two setter methods, and Override the toString() and the equals() methods. The equals() method must return true if the two countries have the same name and same populationSize and false otherwise. The abbreviation is the first letter and the second letter of the country name and must be generated automatically (e.g. if the country name is Palestine the abbreviation is PA, if the country name is Jordan the abbreviation is JO.) Write a main method, define an array of country objects, read countries data from the user, if two countries have the same abbreviation add the last letter from the country name to the abbreviation of the country inserted last. Display countries whose area is greater than 10000 km2.
//Todo write test cases for SimpleCalculator Class // No need to implement the actual Calculator class just write Test cases as per TDD. // you need to just write test cases no mocking // test should cover all methods from calculator and all scenarios, so a minimum of 5 test // 1 for add, 1 for subtract, 1 for multiply, 2 for divide (1 for normal division, 1 for division by 0) // make sure all these test cases fail public class CalculatorTest { //Declare variable here private Calculator calculator; //Add before each here //write test cases here }
Define a class called Country. A Country has population S ize, area, capital, currency, and abbreviation ( (2-3 letters taken from the country name). Define at least two constructors, at least two getter methods, at least two setter methods, and Override the toString() method and the equals() method. The equals() method must return true if the two countries have the same name and same area and false otherwise The abbreviation is the first letter and the letter before the last of the country name and must be generated automatically eg if the country name is Palestine the abbreviation is PN, if the country name is Jordan the abbreviation is JA) Write a main method, define an array of country objects, read countries data from the user, if two countries have the same abbreviation add the last letter from the country name to the abbreviation o one million. f the country inserted last Display countries whose populationSize is greater than
# Coding - Simulate a robot Write a program that simulates the movements of a robot. The robot can have three possible movements: turn right turn left advance The robot is placed on a hypothetical infinite grid, facing a particular direction (north, east, south, or west) at a set of `{x,y}` coordinates,e.g., `{3,8}`, with coordinates increasing to the north and east. Create a Class `Robot` that contains a method `execute` which given a number of instructions will calculate the robot's new position, and the the direction in which it is pointing. ## Example The letter-string "RAALAL" means: Turn right Advance twice Turn left Advance once Turn left yet again Say a robot starts at `{7, 3}` facing north. Running this stream of instructions should leave it at `{9, 4}` facing west. ## Inputs and Outputs The argument of the `execute` is `string` in the format `X Y BEARING COMMANDS`. The method should return a one-liner `string` in the format `X Y BEARING`. In the…
write the definition of a class Counter containing: an instance variable named counter of type int a constructor that takes one int arguement and assigns its value to counter a method named increment that adds one to counter. it does not take parametes or return a value a method named decrement that subtracts one from counter. it does not take parameters or return a value a method named get_value of the instance variable counter write the definition of a class counter containing: an instance variable named counter of type int a constructor that assigns 0 to counter a method named increment that adds one to counter. it does not take parametes or return a value a method named decrement that subtracts one from counter. it does not take parameters or return a value a method named get_value of the instance variable counter using python
write the definition of a class Counter containing: an instance variable named counter of type int a constructor that takes one int arguement and assigns its value to counter a method named increment that adds one to counter. it does not take parametes or return a value a method named decrement that subtracts one from counter. it does not take parameters or return a value a method named get_value of the instance variable counter write the definition of a class counter containing: an instance variable named counter of type int a constructor that assigns 0 to counter a method named increment that adds one to counter. it does not take parametes or return a value a method named decrement that subtracts one from counter. it does not take parameters or return a value a method named get_value of the instance variable counter The second question asks for "a class named Counter that inherits from dict from the previous question" using python
Complete the Login class implementation. For the class method check_credentials(), you will need toaccept two arguments - login and passwd. Do not forget about the self argument. This class method will set two local variables simlogin = "Test" and simpass = "test1234".These variables will simulate the correct login and password for the credential check process. The method will receive the login and password from the user and check it with Test and test1234. If the user sent the correct credentials output: Successful login! If the user sent the correct login name but the wrong password output: Login name is correct, incorrect password! If the user sent an incorrect login name but the correct password output: Login name is incorrect, password accepted! If the user sent both incorrect login name and password output: Unsuccessful login attempt! The class method will return a boolean success variable as True if the login was successful. Using if __name__ == "__main__" to control the flow of…
complete the Login class implementation. For the class method check_credentials(), you will need toaccept two arguments - login and passwd. Do not forget about the self argument. This class method will set two local variables simlogin = "Test" and simpass = "test1234".These variables will simulate the correct login and password for the credential check process. The method will receive the login and password from the user and check it with Test and test1234. If the user sent the correct credentials output: Successful login! If the user sent the correct login name but the wrong password output: Login name is correct, incorrect password! If the user sent an incorrect login name but the correct password output: Login name is incorrect, password accepted! If the user sent both incorrect login name and password output: Unsuccessful login attempt! The class method will return a boolean success variable as True if the login was successful. Using if __name__ == "__main__" to control the flow of…
3. Write a class Student having attributes to store the following data: Name, fathers’ Name, department, degree, enrolment, seat number, marks of three subjects. Also write a class to test all methods of Student class. Add the following methods in the above class. • int getTotal() : This methods returns the total of marks • void printTotal() Prints the total marks of Student • float getPercentage() this method calculates the percentage of a student • void printPercentatge() this method prints the percentage of student • char getGrade() this method calculates and returns the grade. • void printGrade() this method prints the grade of a student. • void printInfo() This method prints all information of the student.
2-Create a class named 'Shape' with a method to print "This is This is shape".Then create two other classes named 'Rectangle', 'Circle' inheriting the Shapeclass, both having a method to print "This is rectangular shape" and "This iscircular shape" respectively. Create a subclass 'Square' of 'Rectangle' having amethod to print "Square is a rectangle". Now call the method of 'Shape' and'Rectangle' class by the object of 'Square' class.