Heterogeneous Container with two element of same type

Question

I am reading Effective Java - Item 29. It talks about Heterogeneous container, in the example:

private Map, Objec         


        

Answer 1

If you put two strings the second will override the first one. So it is useful only if this behaviour is desired. If you want to store more objects under the same key you can use other containers, for example :

Map, List