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CRUDDemo.java
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267 lines (224 loc) · 7.12 KB
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import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.Iterator;
import java.util.ListIterator;
import java.util.Scanner;
class SortBySalary implements Comparator<Customer>{
@Override
public int compare(Customer firstObject, Customer secondObject){
return ((Double)firstObject.getSalary()).compareTo((Double)secondObject.getSalary());
}
}
class SortByName implements Comparator<Customer>{
@Override
public int compare(Customer firstObject, Customer secondObject){
return firstObject.getName().compareTo(secondObject.getName());
}
}
// 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 implements Comparable<Customer>{
private int id;
private String name;
private double salary;
@Override
public int compareTo(Customer object){
// both work for Ascii Order
//return this.name.compareTo(object.name); // Asc
//return object.name.compareTo(this.name); // Desc
// Dictionary Order
//return this.name.compareToIgnoreCase(object.name);
return ((Double)this.salary).compareTo((Double)object.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("8. Sort by Name");
System.out.println("9. Sort By Id");
System.out.println("10. Sort by 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 ==8){
// Lambda
Collections.sort(CustomerOperations.customerList
,(firstObject,secondObject)->
firstObject.getName().
compareToIgnoreCase(secondObject.getName()));
// Anonymous
Collections.sort(CustomerOperations.customerList, new Comparator<Customer>() {
@Override
public int compare(Customer firstObject, Customer secondObject){
return firstObject.getName().compareToIgnoreCase(secondObject.getName());
}
});
//Collections.sort(CustomerOperations.customerList); // Always Call Comparable
//Collections.sort(CustomerOperations.customerList,
//new SortBySalary()); // Always Call Comparator
//Collections.sort(CustomerOperations.customerList,
//new SortByName());
System.out.println("After SOrt By Name");
System.out.println(CustomerOperations.customerList);
}
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...");
}
}
}
}
}