Replace TestEmployee.java

Java8PractiesProgram/src/com/java8/practies/TestEmployee.java

 package com.java8.practies;
 
 import java.util.ArrayList;
+
 import java.util.Comparator;
 import java.util.List;
 import java.util.Map;
@@ -9,6 +10,7 @@ import java.util.function.Function;
 import java.util.stream.Collector;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
+import java.util.Collection;
 public class TestEmployee {
 
 	public static void main(String[] args) {
@@ -92,14 +94,25 @@ public class TestEmployee {
 		 listEmp.stream().filter(x -> !x.getDepartmentNames().stream().equals("EEE"))
 					.collect(Collectors.toList()).forEach(System.out::println); 
 		 
+		 
+		 
 		//given a list of employees. Can you create a map with the count of employees each department has ?
 			//with key as department name and count of employees as value.
 		Stream<String> distinctDept=listEmp.stream()
 				 .map(Employee::getDepartmentNames)
-				  .flatMap(x->x.stream());
+				  .flatMap(Collection::stream);
 		
 		Map<String, Long> mapDepartment = distinctDept.collect(Collectors.groupingBy(Function.identity(), Collectors.counting()));
 		mapDepartment.forEach((k, v) -> System.out.println((k + ":" + v)));
+		
+		
+		//Given a map with the department name as key and value as list of employees belonging to that department.
+		
+		Map<List<String>, List<Employee>> mapEmployee = listEmp.stream()
+				.collect(Collectors.groupingBy(Employee::getDepartmentNames, Collectors.toList()));
+		mapEmployee.forEach((k, v) -> System.out.println((k + ":" + v)));
+
+		
 
 
 	}