Searching for objects in collection

Question

I have a employee data base with 4 attributes
empid, ename,yearofjoining,deptnumber
i want to create a program/data structure, where by i can esily retrive
1) number of employees joining in a given year
2) number of employees joining in a given department in a given year
Please suggest

Answer 1

relaxedgalaxy wrote:
What i am looking for is which collection should i use, Set/List/Map etc..Well.
Does your data structure allow duplicate entries (i.e. is it meaningful if one element is contained twice in there?)
Does the order of elements in your data structure matter?
Is your data structure something that maps some key to some value?
which one of these are most efficient in terms searching timeDoes that matter? Is that part of the assignment?
And just because:
class Employee {
  int empId
  String name
  int yearOfJoining
  int departmentNumber
  String toString() {
    String.format("Employee #%d: %s (%d, dept. %d)", empId, name, yearOfJoining, departmentNumber);
def emps = [
  new Employee(empId: 1, name:"Foo", yearOfJoining:1980, departmentNumber: 1),
  new Employee(empId: 2, name:"Bar", yearOfJoining:1979, departmentNumber: 1),
  new Employee(empId: 3, name:"Baz", yearOfJoining:1980, departmentNumber: 2),
println emps
println emps.findAll({ it.yearOfJoining == 1980 }).size()
println emps.findAll({ it.yearOfJoining == 1980 && it.departmentNumber == 1}).size()(I always wondered why there is no Collection.count(Closure) in Groovy. .findAll(Closure).size() seems so .... un-groovy)