CODEWITHSUNDEEP
javagenerics
littleAlien
littleAlien

Reputation: 821

How to declare generic Map of Map

How to declare such a Map where instead of Object I have specific type:

Map<Class, Map<String, ClassInstance>> map;

Such that could be used as:

Map<String, new Type()) valueMap = new HashMap();
map.put(Type.class, valueMap);

The problem is I can't figure out how to declare generic type of both 'Class' and 'ClassInstance'.

Upvotes: 0

Views: 89

Answers (1)

Andreas
Andreas

Reputation: 159215

Map<Class<?>, Map<String, Object>> map;

You cannot statically enforce that the Object is of the given type. That's for your code to enforce.

Map<String, Object> valueMap = new HashMap<>();
valueMap.put("Foo", new Type());
map.put(Type.class, valueMap);

Upvotes: 1

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