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Which data structure should i use to store and retrieve the following data?
(key1,val1)(key1,val2)(key1,val3)(key2,val4)(key2,val5)(key2,val6)(key3,val7)(key3,val8)(key3,val9)
Please help me.
Take a look at Google Guava’s Multimap and its subtypes ListMultimap and SetMultimap.
From Multimap’s javadoc: A collection similar to a Map, but which may associate multiple values with a
single key.