Add CountEmployeeDeptWise class to count employees by department

Author: kumarcodes

src/main/java/com/superthirty/CountEmployeeDeptWise.java

@@ -0,0 +1,14 @@
+package com.superthirty;
+
+import java.util.List;
+import java.util.Map;
+import java.util.stream.Collectors;
+
+public class CountEmployeeDeptWise {
+    public static void main(String[] args) {
+        List<Employee> employees = EmployeeDTO.getEmployees();
+        Map<String, Long> countMap = employees.stream()
+                .collect(Collectors.groupingBy(Employee::getDepartment, Collectors.counting()));
+        System.out.println(countMap);
+    }
+}