This exercise uses the class NumberStatistics to calculate the sums of multiple objects.
My Code
Main
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner reader = new Scanner(System.in);
// Write test code here
// Remember to remove all the extra code when doing assignments 79.3 and 79.4
NumberStatistics stats = new NumberStatistics();
NumberStatistics even = new NumberStatistics();
NumberStatistics odd = new NumberStatistics();
int input = 0;
System.out.println("Type numbers: ");
input = Integer.parseInt(reader.nextLine());
while (input != -1) {
stats.addNumber(input);
if (input%2 == 0){
even.addNumber(input);
} else {
odd.addNumber(input);
}
input = Integer.parseInt(reader.nextLine());
}
System.out.println("sum: " + stats.sum());
System.out.println("sum of even: " + even.sum());
System.out.println("sum of odd: " + odd.sum());
}
}
NumberStatistics
public class NumberStatistics {
private int amountOfNumbers;
private int sum;
public NumberStatistics() {
// initialize here the object variable amountOfNumbers
this.amountOfNumbers = 0;
this.sum = 0;
}
public void addNumber(int number) {
// code here
this.amountOfNumbers++;
this.sum = this.sum + number;
}
public int amountOfNumbers() {
// code here
return this.amountOfNumbers;
}
public int sum() {
// code here
return this.sum;
}
public double average() {
// code here
if (this.amountOfNumbers == 0) {
return 0;
} else {
return (double) this.sum / this.amountOfNumbers;
}
}
}
Model Code
Main
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner reader = new Scanner(System.in);
// Write test code here
// Remember to remove all the extra code when doing assignments 79.3 and 79.4
// Define three NumberStatistics objects in your program:
// The first is used to track the sum of all given numbers.
// The second takes care of even numbers and the third the odd numbers.
// The tests does not work if you do not create the objects in the correct order
NumberStatistics sum = new NumberStatistics();
NumberStatistics even = new NumberStatistics();
NumberStatistics odd = new NumberStatistics();
System.out.println("Type numbers: ");
while (true) {
int number = Integer.parseInt(reader.nextLine());
if (number == -1) {
break;
}
sum.addNumber(number);
if (number % 2 == 0) {
even.addNumber(number);
} else {
odd.addNumber(number);
}
}
System.out.println("sum: " + sum.sum());
System.out.println("sum of even: " + even.sum());
System.out.println("sum of odd: " + odd.sum());
}
}
NumberStatistics
public class NumberStatistics {
private int amountOfNumbers;
private int sum;
public NumberStatistics() {
this.amountOfNumbers = 0;
this.sum = 0;
}
public void addNumber(int luku) {
this.amountOfNumbers++;
this.sum += luku;
}
public int amountOfNumbers() {
return this.amountOfNumbers;
}
public int sum() {
return this.sum;
}
public double average() {
if (this.amountOfNumbers == 0) {
return 0;
}
return 1.0 * this.sum / this.amountOfNumbers;
}
}Comments
At first I thought my code was awful but on second glance it is only bad. I used a if/else statement where an if would have been enough and the model while loop in the main seems a lot nicer than mine.