blob: 423eca5b8a3798fce3122f0e020a3f28d8a72709 [file] [log] [blame]
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;
class Scratch
{
public static void main(String[] args)
{
final List<ConcreteId> list = new ArrayList<>();
final List<Long> longs = list.stream()
.map(ConcreteId::getId)
.collect(Collectors.toList());
final List<Long> longs2 = list.stream()
.map(AbstractId::getId)
.collect(Collectors.toList());
}
private static abstract class AbstractId
{
private final long id;
public AbstractId(long id)
{
this.id = id;
}
public long getId()
{
return this.id;
}
}
private static class ConcreteId extends AbstractId
{
public ConcreteId(long id)
{
super(id);
}
}
}