using System;
using System.Collections.Generic;
 
public class Test
{
	public Test() {}
	public Test(int id)
	{
		Id = id;
	}
	public long Id { get; set; }
	public override bool Equals(object other)
	{
		var test = other as Test;
		if (test == null) return false;
		return test.Id == Id;
	}
 
	public override int GetHashCode()
	{
		return Id.GetHashCode();
	}
 
	public override string ToString()
	{
		return $"{{ Id: {Id} }}";
	}
 
	public static void Main()
	{
		var map = new Dictionary<string, Test>();
		var test = new Test(5);
		map["hey"] = new Test(0);
		map["hey"] = test;
		test.Id = 6;
		map["hey"] = test;
		map["holla"] = new Test(2);
		foreach(var pair in map) {
			Console.WriteLine("key: {0}, value: {1}", pair.Key, pair.Value);
		}
	}
}

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