java - Checking equals for JAXB object considering some of the fields -

my autogenerated jaxb class

public class employee {    private int id;    private string name;    private string department;     /* getters , setters */  }  employee emp1 = new employee(); emp1.setid(1); emp1.setname("a"); emp1.setdepartment("d1");   employee emp2 = new employee(); emp2.setid(2); emp2.setname("b"); emp2.setdepartment("d1");  list<employee> emplist1 = new arraylist<employee>(); emplist1.add(emp1); emplist2.add(emp2);  employee emp3 = new employee(); emp2.setid(3); emp2.setname("a"); emp2.setdepartment("d1");  list<employee> emplist2 = new arraylist<employee>(); emplist2.add(emp3); 

i want compare both list emplist1 , emplist2 , result list matches name , department fields of employee object.

basically, need intersection of 2 list based on custom comparison of fields in 2 objects.

i looking @ google guava , lambdaj not able find solution/sample doing intersection custom comparison logic.

any idea helpful.

for comparing can use guava ordering or java comparator. , filtering can use predicate.

if want general can use make 1 comparator(for both dep , name)

    class mycomparator implements comparator<employee> {          @override         public int compare(final employee left, final employee right) {             return comparisonchain.start().compare(left.getname(), right.getname())                                   .compare(left.getdepartment(), right.getdepartment()).result();         }      }      class mypredicate implements predicate<employee> {          final list<employee> employees;         final comparator<employee> comparator;          public mypredicate(final list<employee> employees, final comparator<employee> comparator) {             this.employees = employees;             this.comparator = comparator;         }          @override         public boolean apply(@nullable final employee input) {             (final employee e : employees) {                 if (comparator.compare(e, input) == 0) {                     return true;                 }              }              return false;         }      } 

then u can use this:

    final mycomparator comparator = new mycomparator();     final mypredicate predicate1 = new mypredicate(emplist1, comparator);     final mypredicate predicate2 = new mypredicate(emplist2, comparator);     system.out.println("####");     system.out.println(collections2.filter(emplist2, predicate1));     system.out.println(collections2.filter(emplist1, predicate2));