Create a class named Console, and move all the methods that retrieve and validate user input to that class. These methods can re
main static. Create a class named Game, and move all the methods that display messages and handle user guesses to that class. Adjust these methods so they aren't static, and use instance variables of the Game class to keep track of numbers, guesses, and so on. Update the application to use these classes and their methods. Make sure the application functions the same as it did before.
1 answer:
Answer:
Here is the Console class:
import java.util.Scanner; // to accept input from user
public class Console { // class name
public Console() {} //class constructor
public int getInt(Scanner sc, String prompt) { //gets user's number
int i = 0; //initialize i to 0
boolean isValid = false; // checks for valid input
while (!isValid) { //loop iterates as long as input remains valid
System.out.print(prompt); //displays prompt
if (sc.hasNextInt()) { // checks for the next token (input number)
i = sc.nextInt(); // scans and reads the next number
isValid = true; // checks if input is valid
} else { //if input is not valid
System.out.println("Error! Invalid integer value. Try again."); } //displays error message
sc.nextLine(); // discard any other data entered on the line }
return i; } //returns number
public int getIntWithinRange(Scanner sc, String prompt, //checks users guess if outside parameters or not
int min, int max) {
int i = 0;
boolean isValid = false; //sets isValid to false
while (!isValid) { //keeps iterating and stops when isValid is false
i = getInt(sc, prompt); //calls getInt method to get users number
if (i <= min) { //if number is less than value of min
System.out.println("Error! Number must be greater than " + min); //displays this message
} else if (i >= max) { //if number is greater than that of max
System.out.println("Error! Number must be less than " + max); //displays this message
} else { //if guess is right
isValid = true; } } //sets isValid to true
return i; } //returns that number
public String getRequiredString(Scanner sc, String prompt) { //Asks for user's string input
String s = "";
boolean isValid = false; //sets isValid to false
while (!isValid) { //keeps iterating and stops when isValid is false
System.out.print(prompt); //displays prompt
s = sc.nextLine(); //reads next line (read next string input value)
if (s.equals("")) { //if user enters nothing
System.out.println("Error! This entry is required. Try again."); //display this message
} else { //if user enters a string input
isValid = true; } } //sets isValid to true
return s; } //returns string
public String getChoiceString(Scanner sc, String prompt, //Checks for users input for Y/y ignores caps
String s1, String s2) {
String s = "";
boolean isValid = false; //sets isValid to false
while (!isValid) { //iterates until isValid is false
s = getRequiredString(sc, prompt); //calls method to get the input string
if (!s.equalsIgnoreCase(s1) && !s.equalsIgnoreCase(s2)) { // checks users input for Y/y ignores caps
System.out.println("Error! Entry must be '" + s1 + "' or '" + s2 + "'. Try again."); // displays error message that entry must be y or Y
} else { //if user enters y or Y
isValid = true; } } //sets isValid to true
return s; } } //returns y or Y
Explanation:
Here is the Game class
public class Game { // class name
public Game() {} //class constructor
public void displayWelcomeMessage() { //displays message
System.out.println("Welcome to the Guess the Number Game");
System.out.println("++++++++++++++++++++++++++++++++++++");
System.out.println(); }
public void displayPleaseGuessMessage() { //displays message for user to guess from 1-100
System.out.println("I'm thinking of a number from 1 to 100.");
System.out.println("Try to guess it.");
System.out.println();}
public void displayCorrectGuessMessage(int counter) { //display user's current guess count
System.out.println("You got it in " + counter + " tries.");
if (counter <= 3) { //if user guesses the number in 3 or less tries
System.out.println("Great work! You are a mathematical wizard.\n");
} else if (counter > 3 && counter <= 7) { //if user guesses the number greater than 3 but less than or equals to 7 tries
System.out.println("Not too bad! You've got some potential.\n");
} else { //if user guesses the number after more than 7 tries
System.out.println("What took you so long? Maybe you should take some lessons.\n"); }}
public void displayGuessAgainMessage(int number, int guessNumber) { //Asks user to guess again
int difference = guessNumber - number;
if (guessNumber > number) { //if guessNumber is greater than number
if (difference > 10) { //if difference between guessNumber and number is greater than 10
System.out.println("Way too high! Guess again.\n"); //guessed number is higher than correct one
} else {
System.out.println("Too high! Guess again.\n"); }
} else {
if (difference < -10) { //if difference between guessNumber and number is less than -10
System.out.println("Way to low! Guess again.\n"); //guessed number is lower than correct one
} else {
System.out.println("Too low! Guess again.\n");}}}}
The main program and explanation of these above programs are given in the attached document.
The output of the program is attached.
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Answer:
Here is the copy assignment operator for CarCounter:
CarCounter& CarCounter::operator=(const CarCounter& objToCopy) {
carCount = objToCopy.carCount;
return *this; }
The syntax for copy assignment operator is:
ClassName& ClassName :: operator= ( ClassName& object_name)
In the above chunk of code class name Is CarCounter and object name is objToCopy.
Assignment operator = is called which assigns objToCopy.carCount to the new objects's carCount.
This operator basically is called when an object which is already initialized is assigned a new value from another current object.
Then return *this returns the reference to the calling object
Explanation:
The complete program is:
#include <iostream> //to use input output functions
using namespace std; //to access objects like cin cout
class CarCounter { //class name
public: // public member functions of class CarCounter
CarCounter(); //constructor of CarCounter
CarCounter& operator=(const CarCounter& objToCopy); //copy assignment operator for CarCounter
void SetCarCount(const int setVal) { //mutator method to set the car count value
carCount = setVal; } //set carCount so setVal
int GetCarCount() const { //accessor method to get carCount
return carCount; }
private: //private data member of class
int carCount; }; // private data field of CarCounter
CarCounter::CarCounter() { //constructor
carCount = 0; //intializes the value of carCount in constructor
return; }
// FIXME write copy assignment operator
CarCounter& CarCounter::operator=(const CarCounter& objToCopy){
/* copy assignment operator for CarCounter that assigns objToCopy.carCount to the new objects's carCount, then returns *this */
carCount = objToCopy.carCount;
return *this;}
int main() { //start of main() function
CarCounter frontParkingLot; // creates CarCounter object
CarCounter backParkingLot; // creates CarCounter object
frontParkingLot.SetCarCount(12); // calls SetCarCount method using object frontParkingLot to set the value of carCount to 12
backParkingLot = frontParkingLot; //assigns value of frontParkingLot to backParkingLot
cout << "Cars counted: " << backParkingLot.GetCarCount(); //calls accessor GetCarCount method to get the value of carCount and display it in output
return 0; }
The output of this program is:
Cars counted = 12
