Java How to make a list of type B from a list of type A without using loops?

Question

Java

class A{}
class B{
B(A a){}
}
class C {
A a1, a2,a3,a4;
List aList = new ArrayList<>(); List bList; ...

Answer 1

List<A> aList = ...
List<B> bList = aList.stream().map(B::new).collect(Collectors.toList());