问stream.distinct检查列表中是否存在重复值的问题

EN

public Cheminement add(final CheminementForm cheminementForm) throws BadRequestException {
        if(cheminementForm == null){
            log.error("Cheminement can not be null");
            throw new BadRequestException("CheminementForm  can not be null");
        }else if (Objects.isNull(cheminementForm.getName())){
            log.error("All fields must be filled.");
            throw new BadRequestException("All fields must be filled.");
        }
        Cheminement cheminement = Cheminement.builder().disable(false).name(cheminementForm.getName()).build();
        List<CheminementEtape> cheminementEtapeList = new ArrayList<>();

        if(cheminementForm.getPositionsPoste().stream().distinct().count() != cheminementForm.getPositionsPoste().size()){
            throw new BadRequestException("Cannot have same positions");
        }
        for(int i=0; i<cheminementForm.getEtapes().size(); i++){
            if(cheminementForm.getPositionsPoste().get(i) < 0 ){
                throw new BadRequestException("position cannot be null");
            }
            cheminementEtapeList.add(CheminementEtape.builder().cheminement(cheminement).etape(cheminementForm.getEtapes().get(i)).positionPoste(cheminementForm.getPositionsPoste().get(i)).disable(false).build());
        }
        cheminementRepository.save(cheminement);
        cheminementEtapeService.add(cheminementEtapeList);

        return cheminement;
    }

@Data
public class CheminementForm {
    @NotNull(message = "{cheminement.form.name.notEmpty}")
    @Size(min=2, max=30)
    private String name;

    @NotNull(message = "{cheminementEtape.form.etape.notEmpty}")
    private List<Etape> etapes;


    @NotNull(message = "{cheminementEtape.form.positionPoste.notEmpty}")
    private List<Integer> positionsPoste;
}