To get list of member from list of objects using Streams java

Question

I have a class with two members and a list of objects of that class . Now I want to extract list of members from the list of objects.

e.g :

class student {
      int Id;
      String studentName;
}

now I need to retrieve a list of studentName, from list of students. How can this be done with java8 Streams?

Solution without using streams:

List<student> studentList;
List<String> nameList = new ArrayList<String>();
Iterator iterator = studentList.iterator();
while(iterator.hasNext()){
  nameList.add(iterator.next().getStudentName());
}

Solution

You need to use Stream#map method, something like this:

List<Student> students = ...;
List<String> names = students.stream().map(Student::getName).collect(Collectors.toList());

Comments

[user3425563]

thanks . it worked

[Anton Balaniuc]

@user3425563, remember to accept and up-vote one of the answers, if you find it useful.