java - Values Clustering -

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in text file data distributed shown below, considering table ease. 

  column1 column2 column3 column4               b      1       2               b      1       5              c      1       3      b          c      2       3     c               3       4              b      4       5

i need cluster the same values if column1 , column2 same, a->b repeated 3 times combine this. 

          b      1       2            b      1       5           b      4       5

here's how it.

  1. define class record containing 4 fields
  2. define class recordkey containing identification of row, i.e. 2 first column values. make sure equals , hashcode defined.
  3. create map<recordkey, list<record>>.
  4. read records line line. if there list in map current record key, add current record list. otherwise, create new list, add record it, , put list in map.

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