Java 8: extracting sub streams from streams

I have an object stream from which I need to extract a stream with only some object properties

For example, from stream < car >, I need to extract stream < carddetails >

Car {
   String name;
   String model;
   Engine e;
   CarType t;
   ...
}

I want to extract an object stream of type cardetails:

CarDetails {
   String name;
   String model;
}

Solution

Assuming you have the required cardetails constructor, you can do this using map:

Stream<Car> cars = ...
Stream<CarDetails> details = cars.map(c -> new CarDetails(c.getName(),c.getModel()));