import java.io.*;
import java.util.*;

class Product {
	private String product_name; 
	public Product(String name) {product_name=name;}
	public String toString() {return product_name;}
}

public class Main
{
	public static void main(String[] args)
	{
		String [] nArr = {"Helena", "Kit", "Jason"}; //an array
		
		List<String> nList = Arrays.asList(nArr); //returns a List wrapper
		//System.out.println(nList.getClass()); //class java.util.Arrays$ArrayList
		
		nList.set(0, "Marian");//cannot apply .add or .remove which changes array size
		
		System.out.println(Arrays.toString(nArr)); //output: [Marian, Kit, Jason]
		System.out.println(nList); //output: [Marian, Kit, Jason]
	
		Collection<String> c = new ArrayList<>(); c.add("Helena");c.add("Kit");c.add("Jason");
		String[] arr = c.toArray(new String[1]); //create a new array copy; initial size=1; expanded as needed

		arr[0]="Tom";
		
		System.out.println(c); //output: [Helena, Kit, Jason]
		System.out.println(Arrays.toString(arr)); //output: [Tom, Kit, Jason]
	}
}