CODEWITHSUNDEEP
javajava-8java-stream
CodeBlooded
CodeBlooded

Reputation: 175

How to add a value to the field of item in a list using Java 8 stream

I have a class as 

public class Student{
   private String name;
   private String school;

}

and a list of Student objects 

List<Student> students = new ArrayList();

suppose I have already populated the name field of each Student object. Now I want to populate the school field of each object with the same value, say "XYZ school". How can I do this using Java 8 stream()? I tried in following way but it gives error.

List<Student> xyzStudent = students.stream()
    .map(o -> o.setSchool("XYZ school"));

Should I use map there or something else? And how can I collect the the result in xyzStudent?

Upvotes: 1

Views: 4946

Answers (1)

František Hartman
František Hartman

Reputation: 15086

First of all, there is nothing wrong with good old for each loop, even in java 8:

for (Student s : students) {
    s.setSchool("XYZ school");
}

You can use foreach terminal operation to achieve the same behaviour.

students.stream().forEach(s -> s.setSchool("XYZ school"));

Although some people say that operation done in forEach on a stream should not have side effects.

Upvotes: 2

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