CODEWITHSUNDEEP
java
Santhiya
Santhiya

Reputation: 119

Creating possible combinations from Hashmap

I have a HashMap like below

 { HHsize=[HHSize4+, HHSize1, HHSize2, HHSize3], 
   AOB=[AOB<30, AOB30_50, AOB60Plus, AOB50_60],
   Asp=[Asp=N, Asp=Y]}

I need to generate all possible combinations of the value pairs. As a Cartesian product For example.

 [[HHSize4+,AOB<30,Asp=N],
  [HHSize4+,AOB<30,Asp=Y],
  [HHSize4+,AOB30_50,Asp=N],
  [HHSize4+,AOB30_50,Asp=Y],

and so on.

How can we go about this?

Upvotes: 0

Views: 881

Answers (1)

Jean Logeart
Jean Logeart

Reputation: 53849

Using Guava Sets:

List<Set<String>> values = map.values()
                              .stream()
                              .map(HashSet::new)  // to set
                              .collect(Collectors.toList());
Set<List<String>> = Sets.cartesianProduct(values);

Upvotes: 1

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