Question

Question 2 (3 mark): Write a program to implement the class Coffee according to the following UML diagram and description so that it can display as the output example. Coffee -energy: double -protein: double -fat: double +Coffee +Coffee _energy: double, _protein: double. _fat: double) Coffee(sourceCup: Coffee) -printNutrition Information(): void +main(String[] args): void REQUIREMENTS The program has three constructors: the first one is a default constructor, it initializes the 3 data fields (50.0, 1.5, 1.7) at default; the second initializes the 3 data fields with its three double arguments; the last one is the copy constructor. • The method printNutrition Information () takes no argument and returns nothing, it is to display the nutrition information of an object generated from the Coffee class. The displaying format is as follows: It contains ... Cal energy, .- g protein and .. g fat per serving. The main() method is to build 3 objects from the Coffee class: the first object is built by the default constructor; the second object is built by the second constructor where parameters should be passed; the last object is built by the copy constructor where the source object is the second object. Then the nutrition information of the three objects is displayed. Your code must work exactly as the specification and the output should be exactly the same as the output example. Example of the program output: It contains 50.0 Cal energy, 1.5 g protein and 1.7 g fat per serving. It contains 72.0 Cal energy, 1.8 g protein and 1.6 g fat per serving. It contains 72.0 Cal energy, 1.8 g protein and 1.6 g fat per serving.

Answer 1

check out the solution.Programming in JAVA language.

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CODE :

Question 2:

public class Coffee {
// instance attributes
double energy;
double protein;
double fat;
// default constructor
Coffee() {
this.energy = 50.0;
this.protein = 1.5;
this.fat = 1.7;
}
// parameterized constructor
Coffee(double energy, double protein, double fat) {
this.energy = energy;
this.protein = protein;
this.fat = fat;
}
// copy constructor
Coffee(Coffee sourceCup) {
this.energy = sourceCup.energy;
this.protein = sourceCup.protein;
this.fat = sourceCup.fat;
}
// print method implementation
void printNutritionInformation() {
System.out.println("It contains " + this.energy + " Cal energy, " + this.protein + " g protein and " + this.fat + " g fat per serving.");
}
public static void main(String args[]) {
// 3 objects created as instructed
Coffee coffee1 = new Coffee();
Coffee coffee2 = new Coffee(72.0, 1.8, 1.6);
Coffee coffee3 = new Coffee(coffee2);
  
// print information of all objects by calling printNutritionInformation method
coffee1.printNutritionInformation();
coffee2.printNutritionInformation();
coffee3.printNutritionInformation();
} // main ends
} // class ends

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9 1- public class Coffee { 2 // instance attributes 3 double energy; 4 double protein; 5 double fat; 6 // default constructor 7- Coffee() { 8 this.energy = 50.0; this.protein = 1.5; 10 this.fat = 1.7; 11 12 // parameterized constructor 13 Coffee (double energy, double protein, double fat) { 14 this.energy = energy; 15 this.protein = protein; 16 this.fat = fat; 17 18 // copy constructor 19 Coffee Coffee sourceCup) { 20 this.energy = sourceCup.energy; 21 this.protein = sourceCup.protein; 22 this.fat = sourceCup.fat; 23 24 // print method implementation 25 void printNutrition Information() { System.out.println("It contains 26 + this.energy + " Cal energy + this.protein + 27 28 public static void main(String args[]) { 29 // 3 objects created as instructed 30 Coffee coffee1 = new Coffee(); 31 Coffee coffee2 = new Coffee (72.0, 1.8, 1.6); 32 Coffee coffee3 = new Coffee (coffee2); 33 34 // print information of all objects by calling printNutrition Information method 35 coffee1.printNutrition Information(); 36 coffee2.printNutrition Information(); 37 coffee 3.printNutrition Information(); 38 } // main ends 39 } // class ends! 11 g protein and " + this. fat + " g fat per serving."); }

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OUTPUT :

Result compiled and executed in 0.936 sec(s) It contains 50.0 Cal energy, 1.5 g protein and 1.7 g fat per serving. It contains 72.0 Cal energy, 1.8 g protein and 1.6 g fat per serving. It contains 72.0 Cal energy, 1.8 g protein and 1.6 g fat per serving.

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Question 3:

public class PropertyCost {
// class attributes with default values
// private is like read only which can be used by the class only
private static double RATE = 1.1;
private static double UNITPRICE = 1.4;
private static double GST = 0.1;
// main method
public static void main(String args[]) {
System.out.println("Enter the area : ");
// command line argument and convert to double type
double area = Double.parseDouble(args[0]);
// call method and save the returned result in a variable
double cost = calcTotalCharges(area);
// print the result
System.out.printf("Property cost : %.2f", cost);
}
// method definition
public static double calcTotalCharges(double area) {
// expressions mentioned as given in requirement
double actualArea = area * RATE;
double propertyCharge = actualArea * UNITPRICE;
double propertyCost = propertyCharge + propertyCharge * GST;
// return result to main method
return propertyCost;
}
}

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1- 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 public class Property Cost { // class attributes with default values // private is like read only which can be used by the class only private static double RATE = 1.1; private static double UNITPRICE = 1.4; private static double GST = 0.1; // main method public static void main(String args[]) { System.out.println("Enter the area : "); // command line argument and convert to double type double area = Double.parseDouble(args[0]); // call method and save the returned result in a variable double cost = calcTotalCharges (area); // print the result System.out.printf("Property cost : %.2f", cost); // method definition public static double calcTotalCharges (double area) { // expressions mentioned as given in requirement double actualArea = area * RATE; double propertyCharge = actualArea * UNITPRICE; double propertyCost = propertyCharge + propertyCharge // return result to main method return propertyCost; } } GST; }

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OUTPUT :

Command Line Arguments 12.17 Result CPU Time: 0.20 sec(s), Memory: 32664 kilobyte(s) Enter the area : Property cost : 20.62

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NOTE : OUTPUT SHOWN ABOVE IS EXECUTED IN ONLINE COMPILER . OUTPUT AND COMMAND LINE ARGUMENTS FORMAT MAY VARY DEPENDING ON COMPILER.

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