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Using Generics to Store Specific Type of Objects in a HashMap
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Using Generics to Store Specific Type of Objects in a HashMap
This example shows how to use generics to store objects in a HashMap. Before the time of generics,
one could also store specific objects in a Map but it could only be declared to contain Object instances,
without specifying what kind of objects.
And since values in a Map is stored in key / value pairs, the key was also regarded as an Object instance
The HashMap was then declared like this :
HashMap persons = new HashMap();
one could also store specific objects in a Map but it could only be declared to contain Object instances,
without specifying what kind of objects.
And since values in a Map is stored in key / value pairs, the key was also regarded as an Object instance
The HashMap was then declared like this :
HashMap persons = new HashMap();
