Please help finish and improve the following java code for a city of Windsor

Objectives:

Refine and finalize system architecture design.

Implement core functionalities including dataset management and user interaction.

Develop a working prototype demonstrating key features.

Begin testing process to ensure reliability and functionality.

Prepare initial documentation for system components and functionalities.

Code part:

import java.util.List;

$//$ Class representing the main City Data Management System

public class CityDataManagementSystem $\{$

private List datasets;

private UserInterface ui;

private Backend backend;

private Database database;

$//$ Constructor

public CityDataManagementSystem$($List datasets, UserInterface ui$,$ Backend backend, Database database$)\{$

this.datasets $=$ datasets;

this.ui $=$ ui;

this.backend $=$ backend;

this.database $=$ database;

$\}$

$//$ Method to add a new dataset

public void addDataset$($Dataset dataset$)\{$

datasets.add$($dataset$)$;

backend.getDatasetManager$().$addDataset$($dataset$)$;

$\}$

$//$ Method to update an existing dataset

public void updateDataset$($Dataset dataset$)\{$

$//$ Update dataset in datasets list

for $($int i $=0$; i $<$ datasets.size$()$; i$++)\{$

if $($datasets$.$get$($i$).$getName$().$equals$($dataset$.$getName$()))\{$

datasets.set$($i$,$ dataset$)$;

break;

$\}$

$\}$

backend.getDatasetManager$().$updateDataset$($dataset$)$;

$\}$

$//$ Method to delete a dataset

public void deleteDataset$($Dataset dataset$)\{$

datasets.remove$($dataset$)$;

backend.getDatasetManager$().$deleteDataset$($dataset$)$;

$\}$

$//$ Method to authenticate a user

public boolean authenticateUser$($String username, String password$)\{$

return backend.getAuthenticationManager$().$authenticateUser$($username$,$ password$)$;

$\}$

$//$ Method to track dataset usage

public void trackUsage$($Dataset dataset$)\{$

backend.getUsageStatisticsManager$().$trackUsage$($dataset$)$;

$\}$

$//$ Other methods as needed

$\}$

$//$ Class representing a dataset

public class Dataset $\{$

private String name;

private String description;

private String$[]$ fields;

private String source;

private Frequency updateFrequency;

$//$ Other attributes and methods as needed

$//$ Constructor

public Dataset$($String name, String description, String$[]$ fields, String source, Frequency updateFrequency$)\{$

this.name $=$ name;

this.description $=$ description;

this.fields $=$ fields;

this.source $=$ source;

this.updateFrequency $=$ updateFrequency;

$\}$

$//$ Getter and setter methods

$\}$

$//$ Enum representing the frequency of dataset updates

public enum Frequency $\{$

DAILY,

WEEKLY,

MONTHLY,

YEARLY,

REAL$\_$TIME

$\}$

$//$ Interface representing the user interface

public interface UserInterface $\{$

void displayDatasetDetails$($Dataset dataset$)$;

void displaySearchResults$($List results$)$;

void displayVisualization$($Dataset dataset$)$;

$//$ Other methods as needed

$\}$

$//$ Class representing the backend functionality

public class Backend $\{$

private AuthenticationManager authManager;

private DatasetManager datasetManager;

private UsageStatisticsManager usageStatsManager;

$//$ Other components as needed

$//$ Constructor

public Backend$($AuthenticationManager authManager, DatasetManager datasetManager, UsageStatisticsManager usageStatsManager$)\{$

this.authManager $=$ authManager;

this.datasetManager $=$ datasetManager;

this.usageStatsManager $=$ usageStatsManager;

$\}$

$//$ Getter methods

public AuthenticationManager getAuthenticationManager$()\{$

return authManager;

$\}$

public DatasetManager getDatasetManager$()\{$

return datasetManager;

$\}$

public UsageStatisticsManager getUsageStatisticsManager$()\{$

return usageStatsManager;

$\}$

$\}$

$//$ Class representing the authentication manager

public class AuthenticationManager $\{$

public boolean authenticateUser$($String username, String password$)\{$

$//$ Logic for user authentication

return true; $//$ Placeholder return value

$\}$

$//$ Other authentication$-$related methods

$\}$

$//$ Class representing the dataset manager

public class DatasetManager $\{$

private List datasets;

$//$ Constructor

public DatasetManager$($List datasets$)\{$

this.datasets $=$ datasets;

$\}$

$//$ Methods for dataset management

public void addDataset$($Dataset dataset$)\{$

$//$ Logic for adding a new dataset

$\}$

public void updateDataset$($Dataset dataset$)\{$

$//$ Logic for updating an existing dataset

$\}$

public void deleteDataset$($Dataset dataset$)\{$

$//$ Logic for deleting a dataset

$\}$

$//$ Other dataset management met