Question

Refactor the following program to use ArrayList instead of Arrays. You can google "Java ArrayList" or start with the link below:

https://www.thoughtco.com/using-the-arraylist-2034204

import java.util.Scanner;

public class DaysOfWeeks {
public static void main(String[] args) {
String DAY_OF_WEEKS[] = {"Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"};
char ch;
int n;
Scanner scanner = new Scanner(System.in);
do {
System.out.print("Enter the day of the Week: ");
n = scanner.nextInt() - 1;
if (n >= 0 && n <= 6)
System.out.println("The day of the week is " + DAY_OF_WEEKS[n] + ".");
else
System.out.println("Invalid Entry");
System.out.print("Try again (Y/N): ");
ch = scanner.next().charAt(0);
}while(ch=='Y');

}
}

Answer 1

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Scanner;

public class DaysOfWeeks {
    public static void main(String[] args) {
        ArrayList<String> DAY_OF_WEEKS = new ArrayList<String>(Arrays.asList("Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"));
        char ch;
        int n;
        Scanner scanner = new Scanner(System.in);
        do {
            System.out.print("Enter the day of the Week: ");
            n = scanner.nextInt() - 1;
            if (n >= 0 && n <= 6)
                System.out.println("The day of the week is " + DAY_OF_WEEKS.get(n) + ".");
            else
                System.out.println("Invalid Entry");
            System.out.print("Try again (Y/N): ");
            ch = scanner.next().charAt(0);
        } while (ch == 'Y');

    }
}