Intial Commit: Main and model class for exercise

src/main/java/com/nisum/example/client/ClientApp.java

+package com.nisum.example.client;
+
+import com.nisum.example.model.Person;
+
+import java.util.*;
+import java.util.stream.Collectors;
+
+/**
+ * Main class for setting object data and getting results
+ */
+public class ClientApp {
+    public static void main(String[] args) {
+        Person p1= new Person(1201,"HARI",8700,"HYD","DEV","40582678416578",
+                Arrays.asList("7722448815","9966778844","9944668877"));
+        Person p2= new Person
+                (1202,"SHAM",5500,"PUNE","QA",
+                        "69382678416578", Arrays.asList("8855447788","7547871478","0147248784"));
+        Person p3= new Person
+                (1203,"SAI",7500,"BANGLORE","DEV",
+                        "14782678413689", Arrays.asList("7755447788","6767714785","01452487845"));
+        Person p4= new Person
+                (1204,"KIRAN",9500,"CHENNAI","DEV",
+                        "89782678413689", Arrays.asList("8855447788","7667714785","01252487845"));
+        Person p5= new Person
+                (1203,"KHAN",4500,"CHENNAI","PROD",
+                        "60582678413689", Arrays.asList("9955447788","1467714785","02352487845"));
+
+        List<Person> persons=Arrays.asList(p1,p2,p3,p4,p5);
+
+        // find the person id with highest salary in a given department
+       Optional<Person> optionalPerson= persons.stream().filter(p -> p.getDepartment().equals("DEV"))
+                .collect(Collectors.maxBy(Comparator.comparingInt(f-> f.getSalary())));
+       System.out.println
+               (optionalPerson.isPresent()?
+                       "Person ID with highest salary :"+optionalPerson.get().getId():
+                       "Record with highest salary not exist");
+
+
+       // print the no of employees at each location.
+      Map<String,Long> locationCount= persons.stream().collect(Collectors.groupingBy(Person::getLocation,Collectors.counting()));
+      for(String s:locationCount.keySet()){
+          System.out.println(s+"-"+locationCount.get(s));
+      }
+
+    }
+}

src/main/java/com/nisum/example/model/Person.java

+package com.nisum.example.model;
+
+import lombok.*;
+
+import java.util.List;
+
+/**
+ * Model class holds data of person
+ */
+
+@NoArgsConstructor
+@AllArgsConstructor
+@Setter
+@Getter
+@ToString
+public class Person {
+    private int id;
+    private String name;
+    private int salary;
+    private String location;
+    private String department;
+    private String timestamp;
+    private List<String> phones;
+}