How can I define a map like this in Java?
Map<Class<T extends myObject>, MyObjectConverter<T>>
The problem is the T in both arguments. T should be different for each map entry. But I want the map to be restricted to key-value-pairs that "share a common T"
The following definition works, but I think there must be a better way - without CompilerWarnings:
Map<Class<? extends myObject>, MyObjectConverter>
Let's say you have a class that implements a Map.
public class Cache<T> implements Map<... something ...> {
}
the main issue is that you need to clarify in your class declaration of T, not in the constraint of the Map interface.
public class Cache<T extends MyObject> implements Map<T, MyObjectConverter> {
...
}
Likewise (for methods and such) you need to clarify the generic "type" of T prior to using it in constraining parameters.
public <T extends MyObject> Collection<T> doFunc(T input, MyObjectConverter converter) {
...
}
T for each map entry, then this would still bind T to have an upper bound of some concrete class.
MyObject)
T? Where is it declared?Tto be different for each entry?Tto be different for each key-value, but you want thoseT's to share a common superclass (eg:E). Is the superclass ofTan actual concrete class, or is that supposed to be variable as well?