Question 1-NUMBER GENERATOR

Expectation: 
1. Best design practices with modularity and class and type definitions , OO principles to be should
be followed;
2. Documentation to run the code
3. Relevant test cases

Question-1Write a spring boot application that maintains an Inventory of Employee data .
1. API to accept uploading of data as a flat file with line separated data
a. POST /api/employee?action=upload should accept a file
b. FILE CONTENT is lines of names and age – example

GANGULY 32
SACHIN TEND 44

c. The file may have upto 1000,000 data points
d. POST api to upload file should return a task identifying this processing
e. Task should have a get status API to track the completion success or failure of
the task
f. When the processing is done the data should be persisted in the database.
2. CRUD API for employee objects

Optional extension on Question -1 – Containerize the given spring boot app and deploy it to
a public cloud Kubernetes endpoint (Amazon ECS or Google Kubernetes Engine or any
other); Share the documentation on how to test the deployed app; or

Question 2 _Networks: For Both Backend and Full Stack
            2.1Explain the concepts of Default Gateway in IP
            2.2Explain the concepts of SNAT and DNAT
            2.3
 
            A.192.168.101.2/24
            B.192.168.101.3/24
            C.192.168.102.2/24
            D.192.168.102.3/24
 
            A,B,C,D are the IPs to be assigned to four computers ;
            2.1What network elements are need to arrive at the above network architecture ; explain their
configurations in terms at L3/L2
            Details of the IP assignments to be given to each node ;
            2.4 - Explain ARP
 
 
 

Question 3 – UI – Mandatory For Full Stack, Optional for Backend
For Full Stack: UI Question in addition to the Spring App
 
 
Front End Question –
1. Create 2 screens, login and home screen.
2. Login screen should have username(email) and password(min length) field with login
button.
3. On entering valid entries login button should be enabled and submit action should take
user to home screen with welcome user message.
4. Angular features expected
a. Routing(login to home)
b. Field validators(login form error binding)
c. UserService component - Mock service to validate successful login
[Validate User function should check valid email and password of min length 6]

5. Add a readme content which has steps to run the UI.
6. NOTE –
c.       Recommended to use latest Angular version(any version). 
d.       If no prior angular2+ experience, AngularJS 1.0 is also fine.

To throw stack overflow exception. Look at baldung site for example

class Factorial {
    
    public static int factor(int num) {

        return num * factor(num-1);
        
    }
    
    public static void main(String[] args) {
        try{
            System.out.println(Factorial.factor(3));
           // printCharCount("Hello World !!");
        } catch(StackOverflowError e) {
            e.printStackTrace();
        }
    }
}

class Factorial {
   
   public static int factor(int num) {
       return num > 0 ? num * factor(num-1) : 1;   
   }
 
   public static void main(String[] args) {
       try{
           System.out.println(Factorial.factor(3));
          // printCharCount("Hello World !!");
       } catch(StackOverflowError e) {
           e.printStackTrace();
       }
  }
}

import java.util.*;
public class CharCount {
    
    public static void main(String[] args) {
        printCharCount("Hello Wolrd!!!");
        
    }
    
    
     public static void printCharCount(String str) {
        char[] charArr = str.toCharArray();
        Map<Character, Integer> mp = new HashMap<>();
        for (char c : charArr) {
            if(!mp.containsKey(c)) {
                
                mp.put(c, 1);
            } else {
                int count = mp.get(c);
                mp.put(c, count+1);
            }
        }
        
        Set<Map.Entry<Character, Integer>> set = mp.entrySet();
        for (Map.Entry<Character, Integer> c : set) {
            System.out.println(c.getKey() + ": "+c.getValue());
        }
    }   
}

File() {
    File fr = new File("/user/File1.txt");
    Scanner sc = new Scanner(fr);
    while(sc.hasNextLine()) {
        System.out.println(sc.nextLine());
    }
} 

//BufferedReader br = new BufferedReader(new InputStreamReader(file.getInputStream(), "UTF-8"));

public class Solution {
    private static final long N = 10_000L;

    public static void main(String[] args) {
        long[] longArr = LongStream.generate(() -> (long) (Math.random() * 100)).limit(N).toArray();
        long sum = sumOfNumbers(longArr);
        System.out.println("Sum:: " + sum);
        
        Thread t = new Thread(sum);
        t.start();     
    }
    
    private static long sumOfNumbers(long[] numbers) {
        int size = 10;
        long sum = Arrays.asList(numbers).stream().parallel().reduce(0, (a,b) -> (a+b));
    
        return sum;
    }
    

public class Sum implements Callable {
        
        @Override
        public void run() {
            sum(number);
        }
        
        public long sum(long[] number) {
            int i=0, j=numbers.length- 1;
            while(i==j || i<j) {
                 sum += (numbers[i] + number[j]);
            }
            
        }
    }