Java 9 ifPresentOrElse returning value

user_1529441 0
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1/ Working code:

public Student process (int id, name){
  Optional<Student> studentOpt = myrepo.findById(id);
  studentOpt.isPresent() {
    return updateStudent(id, name);
  } else {
   return createStudent(id, name);
  }

2/ I try to change it to 'full lambdas code' (not working):

public Student process (int id, name){
  Optional<Student> studentOpt = myrepo.findById(id);
  return studentOpt.ifPresentOrElse(student-> return updateStudent(id, name), () ->  return createStudent(id, name));
}

1/ should I change it to full lambda? what is the cleanest?

2/ if yes, how ?

java-9 option-type lambda java
1 Answers

Given that your methods updateStudent and createStudent involve some form of side effect and you should generally prefer side effect free lambdas, I don't recommend you use them here. In fact, a simple if-then-else block would be sufficient. However, if you are curious, the equivalent lambda would look like:

return studentOpt
    .map(unused -> updateStudent(id, name))
    .orElseGet(() -> createStudent(id, name));
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