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)
	{
		Map<Integer,Product> parts = new HashMap<>();
		parts.put(4562,new Product("Widget"));
		parts.put(1234,new Product("Toaster"));
		parts.put(9912,new Product("Modem"));
		System.out.println(parts.get(9912));
		
		//Get the view: a set of the keys, for iteration
		Set<Integer> kSet=parts.keySet();
		for(Integer k:kSet)
			System.out.printf("%s(%d) ",parts.get(k),k);
	}
}