How to create a map with Java stream API using a value outside the stream?

Question

I want to init a Map and want to always put the same BigDecimal value from outside of the stream.

BigDeci         


        

Answer 1

Collectors#toMap expects two Functions

set.stream().collect(Collectors.toMap(Function.identity(), x -> samePrice));

You can find nearly the same example within the JavaDoc

 Map studentToGPA
     students.stream().collect(toMap(Functions.identity(),
                                     student -> computeGPA(student)));