package solution.collectionsgenerics;

import java.util.Scanner;
import java.util.Collection;

// This class comprises static helper methods.
public class Helper {

	// Create a Scanner object, to get keyboard input.
	private static Scanner scanner = new Scanner(System.in);
	
	// Get a String from the user.
	public static String getString(String promptMsg) {
		System.out.printf("%s", promptMsg);
		return scanner.next();
	}
	
	// Get a double from the user.
	public static double getDouble(String promptMsg) {
		System.out.printf("%s", promptMsg);
		return scanner.nextDouble();
	}
	
	// Get an int from the user.
	public static int getInt(String promptMsg) {
		System.out.printf("%s", promptMsg);
		return scanner.nextInt();
	}
	
	// Generic method, displays all the items in a Collection<T>.
	public static <T> void displayCollection(Collection<T> list) {
		System.out.printf("Elements in %s:\n", list.getClass().getName());
		for (T element : list) {
			System.out.printf("  %s value: %s.\n", element.getClass().getName(), element);
		}
	}
}