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53 lines (36 loc) · 1.24 KB
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package lambda_expression.unit12;
import java.util.List;
import data.Student;
import data.StudentDataBase;
import static java.util.stream.Collectors.toList;
public class StreamDistinct {
public static void main(String[] args) {
System.out.println(printStudentActivities());
System.out.println(getStudentActivityCount());
System.out.println(getStudentActivitySorted());
}
private static long getStudentActivityCount() {
long count =StudentDataBase.getAllStudents().stream()
.map(Student::getActivities)
.flatMap(List::stream)
.distinct()
.count();
return count;
}
private static List<String> getStudentActivitySorted() {
List<String> studentSortedAcitivities=StudentDataBase.getAllStudents().stream()
.map(Student::getActivities)// Stream<List<String>>
.flatMap(List::stream) // Stream - string, string, string
.distinct()
.sorted()
.collect(toList());
return studentSortedAcitivities;
}
private static List<String> printStudentActivities() {
List<String> studentActivity = StudentDataBase.getAllStudents().stream() // Stream<Student>
.map(Student::getActivities) // Stream<List<String>>
.flatMap(List::stream) // Stream<String>
.distinct().collect(toList());
return studentActivity;
}
}