Java Stream partition, map and join via Collectors

import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

public class Main {
   public static void main(String[] args) {
      Language[] langArray = { //
            new Language("CSS", 55555,"Client"), //
            new Language("HTML", 66666,"Client"), //
            new Language("Java", 44444.5,"Server"), //
            new Language("Javascript", 77777.77,"Client"), //
            new Language("C++", 88888,"Server"), //
            new Language("C", 33333,"Server"), //
            new Language("SQL", 99999.4,"Server") };//

      List<Language> langList = Arrays.asList(langArray);

      langList.stream().forEach(System.out::println);

       //  w  ww .j a  v a2 s .c  om
      Map<Boolean,String> partionedByMaleGender = langList
            .stream()
            .collect(Collectors.partitioningBy(Language::isClient, 
                       Collectors.mapping(Language::getFirstName, Collectors.joining(", "))));
      System.out.println(partionedByMaleGender);
   }
}

class Language {
   private String firstName;
   private double salary;
   private String type;
   
   public Language(String firstName, double salary, String t) {
      this.firstName = firstName;
      this.salary = salary;
      this.type = t; 
       
   }
   public boolean isClient() {
      return "Client".contentEquals(this.type);
   }
   public String getType() {
      return this.type;
   }
   public String getFirstName() {
      return firstName;
   }

   public double getSalary() {
      return salary;
   }

   // return a String containing the Language's information
   @Override
   public String toString() {
      return String.format("%-20s %8.2f", getFirstName(), getSalary());
   }
}