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How to store all three arrays(String array, float array and int array) as HashMaps values ? (or) three different lists instead of arrays. Any other effiient way to return all 3 array values ?

 
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Why not making a class called Employee, with a name, a salary and an age ? You could then instanciate each employee from the resultset, put it in a List<Employee> and return it. I don't think you need to use HashMap here.
 
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