Compare with the value of Collection

Question

I have Collection<Student> and want to return the list of student compare with a filter. For this I have following code

public Collection<Student> findStudents(String filter) {

    return // ?
}

My question is what should be the return statement using WhereIn/Contains ?

Answer 1

Using Google Guava:

Filter a Collection of student names

public Collection<String> findStudents(String filter) {

    Iterable<String> filteredStudents = Iterables.filter(listOfStudentNames, Predicates.containsPattern(filter));
    return Lists.newArrayList(filteredStudents);
}

Filter a Collection<Student>

public Collection<Student> findStudents(String filter) {
  Iterable<Student> filteredStudents = Iterables.filter(listOfStudents, new Predicate<Student>() {
    @Override
    public boolean apply(Student student) {
      return student.getName().contains(filter);
    }
  }
}
return Lists.newArrayList(filteredStudents);

Example:

Iterable<String> filtered = Iterables.filter(Arrays.asList("asdf", "bsdf", "eeadd", "asdfeeee", "123"), Predicates.containsPattern("df"));

filtered now contains [asdf, bsdf, asdfeeee]