alexlarkou

public class School {
    private final String _name;
    private final Stream<Student> _students;

    public School(String schoolName, Stream<Student> students){
        _name = schoolName;
        _students = students;
    }
  
    public String get_name() {

alexlarkou

// C# 
IEnumerable<string> schoolNames = schools.Select(s => s.get_name());
// Java
Stream<String> schoolNames = schools.map(s -> s.get_name());

alexlarkou

// c#
IEnumerable<Student> studentsInAllSchools = schools.SelectMany(s => s.get_students());
// java
Stream<Student> studentsInAllSchools = schools.flatMap(s -> s.get_students());

alexlarkou

// c#
List<Student> studentsInAllSchools = studentsInAllSchools.ToList();
// java
List<Student> studentsInAllSchoolsList = studentsInAllSchools.collect(Collectors.toList());
// or, if you specifically want an arrayList..
List<Student> studentsInAllSchoolsArrayList = studentsInAllSchools.collect(Collectors.toCollection(ArrayList::new));

alexlarkou

// c#
bool doesThisStudentExist = studentsInAllSchools.Any(s => s.get_name() == "Alex");
// java
boolean doesThisStudentExist = studentsInAllSchools.anyMatch(s -> s.get_name() == "Alex");

alexlarkou

// c#
bool doAllStudentsExceed100cmInHeight = studentsInAllSchools.All(s => s.get_height() > 100);
// java
boolean doAllStudentsExceed100cmInHeight = studentsInAllSchools.allMatch(s -> s.get_height() > 100);

alexlarkou

// c#
IEnumerable<Student> studentsInFirstYear = studentsInAllSchools.Where(s => s.get_year() == 1);
// java
Stream<Student> studentsInFirstYear = studentsInAllSchools.filter(s -> s.get_year() == 1);

alexlarkou

// c#
IEnumerable<IGrouping<int, IEnumerable<Student>>> studentsGrouppedByYear = studentsInAllSchools.GroupBy(s => s.get_year());

// java
Map<Integer, List<Student>> studentsGrouppedByYear = studentsInAllSchools.collect(Collectors.groupingBy(s -> s.get_year()));

alexlarkou

// c#
schools.ForEach(s => s.set_address("test address"));
// java
schools.forEach(s -> s.set_address("test address"));

alexlarkou

// c#
int count = schools.count();
double average = allHeights.average()
// java
int count = schools.count();
OptionalDouble average = allHeights.average();