public ListPrincipalsForPortfolioRequest withPortfolioId(String portfolioId) {
        setPortfolioId(portfolioId);
        return this;
    }
<p>
The portfolio identifier.
</p>

@param portfolioId
       The portfolio identifier.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-servicecatalog/src/main/java/com/amazonaws/services/servicecatalog/model/ListPrincipalsForPortfolioRequest.java