gtludwig :
I have a scenario similar to:
public class A {
private String id;
@ManyToMany
private Set<B> bSet;
// getters and setters
}
and
public class B {
private String id;
// other attributes
// getters and setters
}
How can I find an instance of A
when I have an instance of B
using the stream()
API? I was trying something like:
public A findAFromB(B b) {
List<A> aList = aService.findAll();
Optional<A> matchingObject = aList.stream().filter({find a where a.getBSet().contains(b)}).getA();
return (A) matchingObject.get();
}
How to properly write this filter?
Naman :
Soemthing like using a findFirst
or findAny
as a terminal operation:
Optional<A> matchingObject = aList.stream()
.filter(a -> a.getbSet().contains(b))
.findFirst();