How to instantiate guava EnumBiMap?
guava, java
Solution
Do you mean (Guava version 14.0):
Map<Test, Test> m = EnumBiMap.create(Test.class, Test.class);
m.put(Test.VAL, Test.VAL);
And please notice the signature:
<K extends Enum<K>, V extends Enum<V>> EnumBiMap<K, V> create(Class<K> keyType, Class<V> valueType)
So `Integer` and `String` are not suitable for K or V.
Problem
Answer/Edit: Ok, just realized I was trying to use the EnumBiMap incorrectly. I wanted a bi map that does not allow null values, which I guess the Guava library does not have. I looked at ImmutableBiMap but it is supposed to be static, with non-changing values. Guess I'll just have to check for null before I put anything into a HashBiMap. That said, this is how you can instantiate/use EnumBiMap: Given enum: ``` enum Test{ VAL; } ``` Use: ``` Map<Test, Test> m = EnumBiMap.create(Test.class, Test.class); m.put(Test.VAL, Test.VAL); ``` Or, if you want a more generic EnumBiMap, that supports any enum type: ``` Map<Enum, Enum> m = EnumBiMap.create(Enum.class, Enum.class); m.put(Test.VAL, Test2.VAL2); ``` Original question: I have looked around the Guava API documentation and the web, but cannot find any examples of implementing the EnumBiMap class. It doesn't behave the same as HashBiMap, which I could easily instantiate. Here is what I've tried - none of these will compile for me: ``` Map<Integer, String> m = EnumBiMap.create(); ``` ..similar to what is suggested here: Java: Instantiate Google Collection's HashBiMap Also tried: ``` Map<Integer, String> m = EnumBiMap.<Integer, String>create(); ``` ..similar to formatting here: Google Guava: How to use ImmutableSortedMap.naturalOrder? And: ``` Map<Integer, String> m = EnumBiMap.create(Integer.class, String.class); ``` Has anyone successfully implemented EnumBiMap or seen any examples? If so, how?