Java – maps and generic maps
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Java
I want to create a (recursive) map That is, the type value of the map is another map of the same type as the external map
For example:
Map<String,Map<String,... >>>> foo;
Obviously, I need some way to reference the "type being defined" or something else to do this I think I can:
Map<String,?>>
... then just @ suppresswarnings ("unchecked") surpasses the inevitable warnings, but is there a better way?
Solution
Create a helper class or interface to reference the type being defined like this:
class MyMap extends HashMap<String,MyMap> {
...
}
or
interface MyMap extends Map<String,MyMap> {
}
(I don't think you can do without such auxiliary classes / interfaces. When "recursive", you need a name to refer to.)
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