import java.util.ArrayList;

import java.util.Iterator;

import java.util.ListIterator;

import java.util.Scanner;

import javax.sound.midi.Synthesizer;

// What is Utility Class

// All methods are static and Constructor is private

// and class is final

// Utility Interface

//interface CustomerOperations{

final class CustomerOperations{

private CustomerOperations(){}

// It is a generic ArrayList , it hold the customer objects

static final ArrayList<Customer> customerList = new ArrayList<>();

public static void addNewCustomer(int id , String name, double salary){

Customer customer = new Customer(id ,name ,salary);

customerList.add(customer);

System.out.println("Record Added...");

}

public static boolean deleteRecord(Customer deleteObject){

int index = customerList.indexOf(deleteObject);

if(index>=0){

customerList.remove(index);

return true;

}

return false;

}

public static boolean isFound(Customer searchObject){

return customerList.contains(searchObject);

}

static double totalSalary = 0.0;

public static double getTotalSalary(){

// Traverse the ArrayList

// 1st Way (Traditional Style)

//int ee [] = new int[10];

//System.out.println(ee.length);

// for(int i = 0 ; i<customerList.size(); i++){

// Customer customerCurrentObject = customerList.get(i);

// totalSalary = totalSalary + customerCurrentObject.getSalary();

// }

// 1.4 (Iterator) 2nd Way

Iterator<Customer> customerIterator = customerList.iterator();

while(customerIterator.hasNext()){

// next() - get the current object and move to next object

Customer customerObject = customerIterator.next();

totalSalary = totalSalary + customerObject.getSalary();

//customerIterator.remove();

}

// 1.4 ListIterator 3rd Way

ListIterator<Customer> customerListIterator = customerList.listIterator();

while(customerListIterator.hasNext()){

Customer customerObject = customerListIterator.next();

totalSalary = totalSalary + customerObject.getSalary();

}

while(customerListIterator.hasPrevious()){

// give current object and move to previous object

Customer customerObject = customerListIterator.previous();

totalSalary = totalSalary + customerObject.getSalary();

}

// 4th Way (Enhance For Loop (Java 1.5))

for(Customer customerObject : customerList){

totalSalary = totalSalary + customerObject.getSalary();

}

//5th Way forEach function (Java 1.8)

customerList.forEach((customerObject)

->totalSalary+=customerObject.getSalary());

return totalSalary;

}

}

class Customer{

private int id;

private String name;

private double salary;

Customer(int id, String name , double salary){

this.id = id;

this.name = name;

this.salary = salary;

}

@Override

public boolean equals(Object object){

boolean isFound = false;

if(object instanceof Customer){

Customer customer = (Customer) object; // Downcasting

if(this.id == customer.id &&

this.name.equals(customer.name)

&& this.salary == customer.salary){

isFound = true;

}

}

return isFound;

}

public int getId() {

return id;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public double getSalary() {

return salary;

}

public void setSalary(double salary) {

this.salary = salary;

}

@Override

public String toString() {

return "Id "+id + "Name "+name+" Salary "+salary+"\n";

}

}

public class CRUDDemo {

public static void main(String[] args) {

// TODO Auto-generated method stub

Scanner scanner = new Scanner (System.in);

while(true){

System.out.println("1. Add");

System.out.println("2. Delete");

System.out.println("3. Search");

System.out.println("4. Update");

System.out.println("6. Read");

System.out.println("7. Total Salary");

System.out.println("5. Exit");

int choice = scanner.nextInt();

if(choice ==1){

System.out.println("Enter the Id");

int id = scanner.nextInt();

System.out.println("Enter the Name");

String name = scanner.next();

System.out.println("Enter the Salary");

double salary = scanner.nextDouble();

CustomerOperations.addNewCustomer(id, name, salary);

}

else

if(choice == 6){

System.out.println(CustomerOperations.customerList);

}

else

if(choice ==2){

System.out.println("Enter the Id To Delete");

int id = scanner.nextInt();

System.out.println("Enter the Name to Delete");

String name = scanner.next();

System.out.println("Enter the Salary to Delete");

double salary = scanner.nextDouble();

Customer deleteObject = new Customer(id ,name, salary);

if(CustomerOperations.deleteRecord(deleteObject)){

System.out.println("Record Delete");

System.out.println(CustomerOperations.customerList);

}

else

System.out.println("Record Not Found Can't Delete");

}

else

if(choice == 7){

System.out.println(CustomerOperations.getTotalSalary());

}

else

if(choice == 3){

System.out.println("Enter the Id To Search");

int id = scanner.nextInt();

System.out.println("Enter the Name to Search");

String name = scanner.next();

System.out.println("Enter the Salary to Search");

double salary = scanner.nextDouble();

Customer searchCustomerObject = new Customer(id, name,salary);

if(CustomerOperations.isFound(searchCustomerObject)){

System.out.println("Customer Found...");

}

else

{

System.out.println("Customer Not Found...");

}

}

}

}

}