// Java
List <Student> students = database.query <Student> (
  new Predicate <Student> () {
    public boolean match(Student student){
      return student.getAge() < 20
        && student.getName().contains("f");
    }
});

// C#
IList <Student> students = database.Query <Student> (
  delegate(Student student){
    return student.Age < 20
     && student.Name.Contains("f");
});

Example 9: (a) Java; (b) C#.