import java.math.BigDecimal;  

 import java.util.Arrays;  

 import java.util.List;  

 import java.util.Map;  

 import java.util.stream.Collectors;  

 public class C1 {  

      public static void main(String[] arg){  

           Map<String, BigDecimal> result = data().stream()

               .collect(Collectors.groupingBy(Emp::getDept, 

                        Collectors.mapping(Emp::getSalary, Collectors.reducing(BigDecimal.ZERO, BigDecimal::add))));  

           System.out.println(result);  

      }  

      static class Emp{  

           public Emp(String name, String dept, BigDecimal salary) {  

                super();  

                this.name = name;  

                this.dept = dept;  

                this.salary = salary;  

           }  

           private String name;  

           private String dept;  

           private BigDecimal salary;  

           public String getName() {  

                return name;  

           }  

           public String getDept() {  

                return dept;  

           }  

           public BigDecimal getSalary() {  

                return salary;  

           }  

      }  

      private static List<Emp> data(){  

           Emp e1 = new Emp("e1", "dept1", BigDecimal.valueOf(1.1));  

           Emp e2 = new Emp("e2", "dept1", BigDecimal.valueOf(1.1));  

           Emp e3 = new Emp("e3", "dept2", BigDecimal.valueOf(2.1));  

           Emp e4 = new Emp("e4", "dept2", BigDecimal.valueOf(1.9));  

           return Arrays.asList(e1, e2, e3, e4);  

      }  

 }