I have a Chained comparators A list of polymorphic objects is not a problem though. Attribute Description; cn: The cn (or Common-Name) is a single-value attribute that is the object's relative distinguished name. Java java.util.stream.Collectors.groupingBy() syntax. Here Coding compiler sharing a list of 40 Java Objective Questions and Answers for freshers and experienced Java developers.We hope that these Java MCQ Questions will help you to crack your next Java interview.All the best for your future and happy Java learning. Core Java Multiple Choice Questions Java Stream: Grouping and counting by multiple fields, In case you don't want to create a new key class, as suggested by assylias, you can do a double groupingBy. The idea here is to filter a list of Employee objects based on a list of Department objects. ComparisonChain 5. More specifically, we want to find all Employees from a list that: have “sales” as their department and; have a corresponding employeeId in a list of Departments; And to achieve this, we'll actually filter one inside the other: Outlook. The cn is the name of the group in Active Directory Domain Services. This concept of grouping is the same as the ‘group by’ clause in SQL which takes an attribute, or a calculated value derived from attribute(s), to divide the retrieved records in distinct groups. In this blog post you've learned how Gson is able to map List (or Array) data without any problems. Map