PasswordCheckerGUI.javaimport javafx.application.Application; im.pdf

PasswordCheckerGUI.java
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import javafx.scene.control.Tooltip;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.VBox;
import javafx.scene.layout.HBox;
import javafx.stage.Stage;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.Pos;
import javafx.geometry.Insets;
import java.io.File;
import java.io.FileNotFoundException;
import java.util.ArrayList;
import java.util.Scanner;
import javax.swing.JFileChooser;
import javax.swing.JOptionPane;
public class PasswordCheckerGUI extends Application {
Label passwordRulesLabel; // Declares variable to display the rules of setting a valid
password
Label passwordLabel; // Declares variable to hold the "Password" Label
Label retypePasswordLabel; // Declares variable to hold the "Re-type Password"
Label
TextField passwordTextField; // Declares variable to hold the "Password" entry textfield
TextField retypePasswordTextField; // Declares variable to hold the "Re-type Password"
entry textfield
Button checkPasswordButton; // Declares variable to hold the "Check Password" button
Button checkFilePasswordsButton; // Declares variable to hold the "Check Passwords in

File" button
Button exitButton; // Declares variable to hold the "Exit" button
// Creates an instance of the PasswordChecker class to use in order to validate the passwords
PasswordChecker check = new PasswordChecker();
@Override
public void start(Stage stage)
{
// Create the label that will display the rules of creating a password
passwordRulesLabel = new Label("Use the following rules when creating your passwords
"
+ "1. Length must be greater than 8 "
+ "2. Must contain at least one upper case alpha character "
+ "3. Must contain at least on lower case alpha character "
+ "4. Must contain at least one numeric character "
+ "5. May not have more than 2 of the same character in sequence ");
// Create the password and re-type password labels to let the user know where to enter their
desired password
passwordLabel = new Label("Password");
retypePasswordLabel = new Label("Re-typePassword");
// Create the textfields to allow the user to enter their desired password
passwordTextField = new TextField();
passwordTextField.setPrefWidth(210);
retypePasswordTextField = new TextField();
retypePasswordTextField.setPrefWidth(210);
// Create the buttons that will be used by the password application to perform its functions.
checkPasswordButton = new Button("_Check Password");

// Assign the C key as the mnemonic for the "Check Password" button
checkPasswordButton.setMnemonicParsing(true);
// Add a tooltip to the "Check Password" button
checkPasswordButton.setTooltip(new Tooltip("Click here to check if the desired password
is valid."));
checkPasswordButton.setPadding(new Insets(5, 18, 5, 18));
checkFilePasswordsButton = new Button("Check Passwo_rds in File");
// Assign the R key as the mnemonic for the "Check Passwords in File" button
checkFilePasswordsButton.setMnemonicParsing(true);
// Add a tooltip to the "Check Passwords in File" button
checkFilePasswordsButton.setTooltip(new Tooltip("Click here to select the file containing
the passwords."));
checkFilePasswordsButton.setPadding(new Insets(5, 18, 5, 18));
exitButton = new Button("_Exit");
// Assign the E key as the mnemonic for the "Exit" button
exitButton.setMnemonicParsing(true);
// Add a tooltip to the "Exit" button
exitButton.setTooltip(new Tooltip("Click here to exit."));
exitButton.setPadding(new Insets(5, 18, 5, 18));
// Sets event handlers on each button, which will perform different actions, depending on
which button the user clicks.
checkPasswordButton.setOnAction(new CheckPasswordButtonEventHandler());
checkFilePasswordsButton.setOnAction(new CheckFilePasswordsButtonEventHandler());
exitButton.setOnAction(new ExitButtonEventHandler());
// Create a horizontal box that will hold the "Password" label and textfield in one row
HBox passwordInput = new HBox(10);
passwordInput.setAlignment(Pos.CENTER);
passwordInput.getChildren().addAll(passwordLabel,passwordTextField);
// Create a horizontal box that will hold the "Re-type Password" label and textfield in one
row

HBox retypePasswordInput = new HBox(10);
retypePasswordInput.setAlignment(Pos.CENTER);
retypePasswordInput.getChildren().addAll(retypePasswordLabel,retypePasswordTextField);
// Create a verticle box, that will nest the passwordInput and retypePasswordInput panes on
top of each other.
VBox passwordInfoPane = new VBox(10);
passwordInfoPane.setPadding(new Insets(20, 0, 40, 0));
passwordInfoPane.setAlignment(Pos.CENTER);
// Add the buttons to the children of the buttonPane horizontal box
passwordInfoPane.getChildren().addAll(passwordInput,retypePasswordInput);
// Create a horizontal box, that will place all the buttons next to each other, that will be used
in the GUI.
HBox buttonPane = new HBox(25);
buttonPane.setAlignment(Pos.CENTER);
buttonPane.getChildren().addAll(checkPasswordButton,checkFilePasswordsButton,exitButton);
// Create a vertical box that will nest the passwordRulesLabel on top, followed by the
passwordInfoPane, and then the buttonPane at the bottom.
VBox contentPane = new VBox(30);
contentPane.setAlignment(Pos.CENTER);
contentPane.setPadding(new Insets(15, 50, 10, 50));
contentPane.getChildren().addAll( passwordRulesLabel,passwordInfoPane, buttonPane);
// Create a BorderPane to place contentPane into the center of the GUI display.
// contentPane contains all the nested Hbox's and Vbox's that were created to properly
organize and display the contents of the GUI application.
BorderPane displayPane = new BorderPane();
// Place the contentPane in the center region of the BorderPane.

displayPane.setCenter(contentPane);
// Set displayPane as root of scene and set the scene on the stage
Scene scene = new Scene(displayPane);
stage.setTitle("Password Checker");
stage.setScene(scene);
stage.show();
}
// Will check to see if the password that is entered by the user is valid, and it will catch the
appropriate exception thrown if it's not.
class CheckPasswordButtonEventHandler implements EventHandler
{
@Override
public void handle(ActionEvent event)
{
String password = null;
String retypedPassword = null;
// Extract the password and retyped password from the input textfields
password = passwordTextField.getText().trim();
retypedPassword = retypePasswordTextField.getText().trim();
try
{
// If the password and re-typed passwords are not the same, then throw an
UnmatchedException.
if(!password.equals(retypedPassword))
{
UnmatchedException exception = new UnmatchedException ("The passwords do
not match");
throw exception;
}
// Use the object created from the instance of the PasswordChecker class to call the
isValidPassword method, and determine whether the password entered is valid or not.
// If the passwrod is not valid, then it will throw an exception.

check.isValidPassword(password);
// If no exception is thrown, then display to user that password is valid.
JOptionPane.showMessageDialog(null, "Password is valid", "Password Status",
JOptionPane.INFORMATION_MESSAGE);
}
// If the isValidPassword method from the PasswordChecker class throws a
UnmatchedException, then catch it and display the appropriate message.
catch (UnmatchedException exception)
{
JOptionPane.showMessageDialog(null, "UnmatchedException: The passwords do not
match.", "Password Status", JOptionPane.INFORMATION_MESSAGE);
exception.printStackTrace();
}
LengthException, then catch it and display the appropriate message.
catch (LengthException e) {
JOptionPane.showMessageDialog(null, "LengthException: The password must be at
least 8 characters long.", "Password Error", JOptionPane.INFORMATION_MESSAGE);
e.printStackTrace();
}
NoDigitException, then catch it and display the appropriate message.
catch (NoDigitException e) {
JOptionPane.showMessageDialog(null, "NoDigitException: The password must
contain at least one digit.","Password Error", JOptionPane.INFORMATION_MESSAGE);
}
NoUpperAlphaException, then catch it and display the appropriate message.
catch (NoUpperAlphaException e) {
JOptionPane.showMessageDialog(null, "NoUpperAlphaException: The password
must contain at least one uppercase alphabetic character.", "Password Error",

}
NoLowerAlphaException, then catch it and display the appropriate message.
catch (NoLowerAlphaException e) {
JOptionPane.showMessageDialog(null, "NoLowerAlphaException: The password
must contain at least one lowercase alphabetic character.","Password Error",
}
InvalidSequenceException, then catch it and display the appropriate message.
catch (InvalidSequenceException e) {
JOptionPane.showMessageDialog(null, "InvalidSequenceException: The password
cannot contain more than two of the same character in sequence.","Password Error",
}
}
}
// It will check to see which passwords are invalid from the file that is read in, and also display
its error status.
class CheckFilePasswordsButtonEventHandler implements EventHandler
{
@Override
{
File selectedFile = null;
Scanner inputFile;
ArrayList passwordList = new ArrayList<>(); // Declares a String ArrayList to hold the
contents of the file being read.
ArrayList illegalList = new ArrayList<>(); // Declares a String ArrayList to hold all the
invalid passwords from the file that was read in.
// Will display a window box allowing the user to select a file from their computer to

open, in order to read its list of passwords.
JFileChooser fileChooser = new JFileChooser();
int status = fileChooser.showOpenDialog(null);
if (status == JFileChooser.APPROVE_OPTION)
{
selectedFile = fileChooser.getSelectedFile();
}
try
{
inputFile = new Scanner(selectedFile);
// Read each password, line by line from the .txt file into a String ArrayList
while (inputFile.hasNext())
{
passwordList.add(inputFile.nextLine());
}
illegalList = check.validPasswords(passwordList);
// A string that will display all the invalid passwords and their error status messages
one by one in a new row.
String illegal = "";
// Loop through the illegalList ArrayList and place each invalid password one by one
in a new row in the string.
for(int i =0; i < illegalList.size(); i++)
{
illegal += illegalList.get(i) + " ";
}
// Display a message to the user showing all the invalid passwords that were read from
the file, along with their error status message.
JOptionPane.showMessageDialog(null, illegal, "Illegal passwords",

}
catch (FileNotFoundException e)
{
}
}
}
// Will exit the program, if user clicks the "Exit" button.
class ExitButtonEventHandler implements EventHandler
{
@Override
{
System.exit(0);
}
}
// Will launch the GUI for the PasswordChecker application.
public static void main(String[] args) {
launch(args);
}
}
PasswordChecker.java
public class PasswordChecker implements PasswordCheckerInterface {
private String password; // Will hold the string that is passed into the
isValidPassword method.
private ArrayList illegalPasswords; // Will hold the list of passwords that are found to be
invalid from the list that is passed into the validPasswords method.
public boolean isValidPassword (String passwordString) throws LengthException,
NoDigitException, NoUpperAlphaException, NoLowerAlphaException,
InvalidSequenceException

{
password = passwordString;
char ch = password.charAt(0);
// If the password is less than 8 characters, then throw the lengthException.
if( password.length() < 8)
{
throw new LengthException ("The password must be at least 8 characters long.");
}
// If the first character in the password is not a numeric character, then check to see if the
rest of the password contains at least one numeric character.
if(!Character.isDigit(ch))
{
// Set the initial value of hasDigit to be false
boolean hasDigit = false;
// Loop through the length of the password, and if there is a character that has a digit, then
the variable hasDigit will be true.
for (int i = 0; i < password.length(); i++)
{
ch = password.charAt(i);
if(Character.isDigit(ch))
{
hasDigit = true;
}
}
// If there is no digit, then throw the NoDigitException
if(!hasDigit)
{
throw new NoDigitException ("The password must contain at least one digit.");
}
}

// If the first character in the password is not upper case, then check to see if the rest of the
password contains at least one upper case letter.
if(!Character.isUpperCase(ch))
{
boolean hasUppercase = !password.equals(password.toLowerCase());
//If the password does not have uppercase, then throw the NoUpperAlphaException.
if(!hasUppercase)
{
throw new NoUpperAlphaException ("The password must contain at least one uppercase
alphabetic character.");
}
}
// If the first character in the password is not lower case, then check to see if the rest of the
password contains at least one lower case letter.
if(!Character.isLowerCase(ch))
{
boolean hasLowercase = !password.equals(password.toUpperCase());
if(!hasLowercase)
{
throw new NoLowerAlphaException ("The password must contain at least one
lowercase alphabetic character.");
}
}
// If the first character in the password is either a lower case, upper case, or numeric
character, then check to see if the password does not contain more than 2 of the same character
in sequence.
if(Character.isLowerCase(ch) || Character.isUpperCase(ch) || Character.isDigit(ch) )
{
for (int i = 0; i < password.length() - 2; i++)
{
if( (password.charAt(i) == password.charAt(i + 1)) && (password.charAt(i) ==
password.charAt(i+2)) )

{
throw new InvalidSequenceException ("The password cannot contain more than
two of the same character in sequence.");
}
}
}
return true;
}
/**
* Will check an ArrayList of passwords and returns an ArrayList with the status of any invalid
passwords.
*/
public ArrayList validPasswords(ArrayList passwords)
{
// an ArrayList to hold all the invalid passwords found
illegalPasswords = new ArrayList();
String errorMessage = null;
for(int i = 0; i < passwords.size(); i++)
{
try
{
isValidPassword(passwords.get(i));
}
catch (LengthException e)
{
errorMessage = passwords.get(i) + " The password must be at least 8 characters
long.";
illegalPasswords.add(errorMessage);
}
errorMessage = passwords.get(i) + " The password must contain at least one digit.";
}

errorMessage = passwords.get(i) + " The password must contain at least one
uppercase alphabetic character.";
}
lowercase alphabetic character.";
}
errorMessage = passwords.get(i) + " The password cannot contain more than two of
the same character in sequence.";
}
}
//Return the ArrayList that contains all the invalid passwords only
return illegalPasswords;
}
}
PasswordCheckerInterface.java
public interface PasswordCheckerInterface {
/**
* Will check the validity of the password passed in, and returns true if the password is valid,
or throws an exception if invalid.
*/
InvalidSequenceException;
/**
passwords.

*/
public ArrayList validPasswords (ArrayList passwords);
}
NoDigitException.java
@SuppressWarnings("serial")
public class NoDigitException extends Exception {
public NoDigitException()
{
}
/**
* Constructor that will take in a message, which will be displayed if NoDigitException is
thrown.
*/
public NoDigitException(String message)
{
super(message);
}
}
LengthException.java
public class LengthException extends Exception
{
public LengthException()
{
}
/**
* Constructor that will take in a message, which will be displayed if LengthException is
thrown.
*/
public LengthException(String message)
{
super(message);

}
}
NoUpperAlphaException.java
public class NoUpperAlphaException extends Exception {
public NoUpperAlphaException()
{
}
/**
* Constructor that will take in a message, which will be displayed if NoUpperAlphaException
is thrown.
*/
public NoUpperAlphaException(String message)
{
super(message);
}
}
NoLowerAlphaException.java
public class NoLowerAlphaException extends Exception {
public NoLowerAlphaException()
{
}
/**
* Constructor that will take in a message, which will be displayed if NoLowerAlphaException
is thrown.
*/
public NoLowerAlphaException(String message)
{
super(message);
}
}

InvalidSequenceException.java
public class InvalidSequenceException extends Exception {
public InvalidSequenceException()
{
}
/**
* Constructor that will take in a message, which will be displayed if
InvalidSequenceException is thrown.
*/
public InvalidSequenceException(String message)
{
super(message);
}
}
Solution
PasswordCheckerGUI.java
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import javafx.scene.control.Tooltip;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.VBox;
import javafx.scene.layout.HBox;
import javafx.stage.Stage;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.Pos;
import javafx.geometry.Insets;

import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;
import javax.swing.JFileChooser;
import javax.swing.JOptionPane;
public class PasswordCheckerGUI extends Application {
Label passwordRulesLabel; // Declares variable to display the rules of setting a valid
password
Label passwordLabel; // Declares variable to hold the "Password" Label
Label retypePasswordLabel; // Declares variable to hold the "Re-type Password"
Label
TextField passwordTextField; // Declares variable to hold the "Password" entry textfield
TextField retypePasswordTextField; // Declares variable to hold the "Re-type Password"
entry textfield
Button checkPasswordButton; // Declares variable to hold the "Check Password" button
Button checkFilePasswordsButton; // Declares variable to hold the "Check Passwords in
File" button
Button exitButton; // Declares variable to hold the "Exit" button
// Creates an instance of the PasswordChecker class to use in order to validate the passwords
PasswordChecker check = new PasswordChecker();
@Override
public void start(Stage stage)
{
// Create the label that will display the rules of creating a password
passwordRulesLabel = new Label("Use the following rules when creating your passwords
"
+ "1. Length must be greater than 8 "
+ "2. Must contain at least one upper case alpha character "
+ "3. Must contain at least on lower case alpha character "
+ "4. Must contain at least one numeric character "

+ "5. May not have more than 2 of the same character in sequence ");
// Create the password and re-type password labels to let the user know where to enter their
desired password
passwordLabel = new Label("Password");
retypePasswordLabel = new Label("Re-typePassword");
// Create the textfields to allow the user to enter their desired password
passwordTextField = new TextField();
passwordTextField.setPrefWidth(210);
retypePasswordTextField = new TextField();
retypePasswordTextField.setPrefWidth(210);
// Create the buttons that will be used by the password application to perform its functions.
checkPasswordButton = new Button("_Check Password");
// Assign the C key as the mnemonic for the "Check Password" button
checkPasswordButton.setMnemonicParsing(true);
// Add a tooltip to the "Check Password" button
checkPasswordButton.setTooltip(new Tooltip("Click here to check if the desired password
is valid."));
checkPasswordButton.setPadding(new Insets(5, 18, 5, 18));
checkFilePasswordsButton = new Button("Check Passwo_rds in File");
// Assign the R key as the mnemonic for the "Check Passwords in File" button
checkFilePasswordsButton.setMnemonicParsing(true);
// Add a tooltip to the "Check Passwords in File" button
checkFilePasswordsButton.setTooltip(new Tooltip("Click here to select the file containing
the passwords."));
checkFilePasswordsButton.setPadding(new Insets(5, 18, 5, 18));
exitButton = new Button("_Exit");

// Assign the E key as the mnemonic for the "Exit" button
exitButton.setMnemonicParsing(true);
// Add a tooltip to the "Exit" button
exitButton.setTooltip(new Tooltip("Click here to exit."));
exitButton.setPadding(new Insets(5, 18, 5, 18));
// Sets event handlers on each button, which will perform different actions, depending on
which button the user clicks.
checkPasswordButton.setOnAction(new CheckPasswordButtonEventHandler());
checkFilePasswordsButton.setOnAction(new CheckFilePasswordsButtonEventHandler());
exitButton.setOnAction(new ExitButtonEventHandler());
// Create a horizontal box that will hold the "Password" label and textfield in one row
HBox passwordInput = new HBox(10);
passwordInput.setAlignment(Pos.CENTER);
passwordInput.getChildren().addAll(passwordLabel,passwordTextField);
// Create a horizontal box that will hold the "Re-type Password" label and textfield in one
row
HBox retypePasswordInput = new HBox(10);
retypePasswordInput.setAlignment(Pos.CENTER);
retypePasswordInput.getChildren().addAll(retypePasswordLabel,retypePasswordTextField);
// Create a verticle box, that will nest the passwordInput and retypePasswordInput panes on
top of each other.
VBox passwordInfoPane = new VBox(10);
passwordInfoPane.setPadding(new Insets(20, 0, 40, 0));
passwordInfoPane.setAlignment(Pos.CENTER);
passwordInfoPane.getChildren().addAll(passwordInput,retypePasswordInput);
// Create a horizontal box, that will place all the buttons next to each other, that will be used
in the GUI.

HBox buttonPane = new HBox(25);
buttonPane.setAlignment(Pos.CENTER);
buttonPane.getChildren().addAll(checkPasswordButton,checkFilePasswordsButton,exitButton);
// Create a vertical box that will nest the passwordRulesLabel on top, followed by the
passwordInfoPane, and then the buttonPane at the bottom.
VBox contentPane = new VBox(30);
contentPane.setAlignment(Pos.CENTER);
contentPane.setPadding(new Insets(15, 50, 10, 50));
contentPane.getChildren().addAll( passwordRulesLabel,passwordInfoPane, buttonPane);
// Create a BorderPane to place contentPane into the center of the GUI display.
// contentPane contains all the nested Hbox's and Vbox's that were created to properly
organize and display the contents of the GUI application.
BorderPane displayPane = new BorderPane();
// Place the contentPane in the center region of the BorderPane.
displayPane.setCenter(contentPane);
// Set displayPane as root of scene and set the scene on the stage
Scene scene = new Scene(displayPane);
stage.setTitle("Password Checker");
stage.setScene(scene);
stage.show();
}
// Will check to see if the password that is entered by the user is valid, and it will catch the
appropriate exception thrown if it's not.
class CheckPasswordButtonEventHandler implements EventHandler
{
@Override
{
String password = null;

String retypedPassword = null;
// Extract the password and retyped password from the input textfields
password = passwordTextField.getText().trim();
retypedPassword = retypePasswordTextField.getText().trim();
try
{
// If the password and re-typed passwords are not the same, then throw an
UnmatchedException.
if(!password.equals(retypedPassword))
{
UnmatchedException exception = new UnmatchedException ("The passwords do
not match");
throw exception;
}
// Use the object created from the instance of the PasswordChecker class to call the
isValidPassword method, and determine whether the password entered is valid or not.
// If the passwrod is not valid, then it will throw an exception.
check.isValidPassword(password);
// If no exception is thrown, then display to user that password is valid.
JOptionPane.showMessageDialog(null, "Password is valid", "Password Status",
}
UnmatchedException, then catch it and display the appropriate message.
catch (UnmatchedException exception)
{
JOptionPane.showMessageDialog(null, "UnmatchedException: The passwords do not
match.", "Password Status", JOptionPane.INFORMATION_MESSAGE);
exception.printStackTrace();
}

LengthException, then catch it and display the appropriate message.
catch (LengthException e) {
JOptionPane.showMessageDialog(null, "LengthException: The password must be at
least 8 characters long.", "Password Error", JOptionPane.INFORMATION_MESSAGE);
}
NoDigitException, then catch it and display the appropriate message.
JOptionPane.showMessageDialog(null, "NoDigitException: The password must
contain at least one digit.","Password Error", JOptionPane.INFORMATION_MESSAGE);
}
NoUpperAlphaException, then catch it and display the appropriate message.
JOptionPane.showMessageDialog(null, "NoUpperAlphaException: The password
must contain at least one uppercase alphabetic character.", "Password Error",
}
NoLowerAlphaException, then catch it and display the appropriate message.
JOptionPane.showMessageDialog(null, "NoLowerAlphaException: The password
must contain at least one lowercase alphabetic character.","Password Error",
}
InvalidSequenceException, then catch it and display the appropriate message.
JOptionPane.showMessageDialog(null, "InvalidSequenceException: The password
cannot contain more than two of the same character in sequence.","Password Error",

}
}
}
// It will check to see which passwords are invalid from the file that is read in, and also display
its error status.
class CheckFilePasswordsButtonEventHandler implements EventHandler
{
@Override
{
File selectedFile = null;
Scanner inputFile;
ArrayList passwordList = new ArrayList<>(); // Declares a String ArrayList to hold the
contents of the file being read.
ArrayList illegalList = new ArrayList<>(); // Declares a String ArrayList to hold all the
invalid passwords from the file that was read in.
// Will display a window box allowing the user to select a file from their computer to
open, in order to read its list of passwords.
JFileChooser fileChooser = new JFileChooser();
int status = fileChooser.showOpenDialog(null);
if (status == JFileChooser.APPROVE_OPTION)
{
selectedFile = fileChooser.getSelectedFile();
}
try
{
inputFile = new Scanner(selectedFile);
// Read each password, line by line from the .txt file into a String ArrayList
while (inputFile.hasNext())
{

passwordList.add(inputFile.nextLine());
}
illegalList = check.validPasswords(passwordList);
// A string that will display all the invalid passwords and their error status messages
one by one in a new row.
String illegal = "";
// Loop through the illegalList ArrayList and place each invalid password one by one
in a new row in the string.
for(int i =0; i < illegalList.size(); i++)
{
illegal += illegalList.get(i) + " ";
}
// Display a message to the user showing all the invalid passwords that were read from
the file, along with their error status message.
JOptionPane.showMessageDialog(null, illegal, "Illegal passwords",
}
catch (FileNotFoundException e)
{
}
}
}
// Will exit the program, if user clicks the "Exit" button.
class ExitButtonEventHandler implements EventHandler
{
@Override
{
System.exit(0);
}
}

// Will launch the GUI for the PasswordChecker application.
public static void main(String[] args) {
launch(args);
}
}
PasswordChecker.java
public class PasswordChecker implements PasswordCheckerInterface {
private String password; // Will hold the string that is passed into the
isValidPassword method.
private ArrayList illegalPasswords; // Will hold the list of passwords that are found to be
invalid from the list that is passed into the validPasswords method.
InvalidSequenceException
{
password = passwordString;
char ch = password.charAt(0);
// If the password is less than 8 characters, then throw the lengthException.
if( password.length() < 8)
{
throw new LengthException ("The password must be at least 8 characters long.");
}
// If the first character in the password is not a numeric character, then check to see if the
rest of the password contains at least one numeric character.
if(!Character.isDigit(ch))
{
// Set the initial value of hasDigit to be false
boolean hasDigit = false;

// Loop through the length of the password, and if there is a character that has a digit, then
the variable hasDigit will be true.
for (int i = 0; i < password.length(); i++)
{
ch = password.charAt(i);
if(Character.isDigit(ch))
{
hasDigit = true;
}
}
// If there is no digit, then throw the NoDigitException
if(!hasDigit)
{
throw new NoDigitException ("The password must contain at least one digit.");
}
}
// If the first character in the password is not upper case, then check to see if the rest of the
password contains at least one upper case letter.
if(!Character.isUpperCase(ch))
{
boolean hasUppercase = !password.equals(password.toLowerCase());
//If the password does not have uppercase, then throw the NoUpperAlphaException.
if(!hasUppercase)
{
throw new NoUpperAlphaException ("The password must contain at least one uppercase
alphabetic character.");
}
}
// If the first character in the password is not lower case, then check to see if the rest of the
password contains at least one lower case letter.

if(!Character.isLowerCase(ch))
{
boolean hasLowercase = !password.equals(password.toUpperCase());
if(!hasLowercase)
{
throw new NoLowerAlphaException ("The password must contain at least one
lowercase alphabetic character.");
}
}
// If the first character in the password is either a lower case, upper case, or numeric
character, then check to see if the password does not contain more than 2 of the same character
in sequence.
if(Character.isLowerCase(ch) || Character.isUpperCase(ch) || Character.isDigit(ch) )
{
for (int i = 0; i < password.length() - 2; i++)
{
if( (password.charAt(i) == password.charAt(i + 1)) && (password.charAt(i) ==
password.charAt(i+2)) )
{
throw new InvalidSequenceException ("The password cannot contain more than
two of the same character in sequence.");
}
}
}
return true;
}
/**
passwords.
*/
public ArrayList validPasswords(ArrayList passwords)
{
// an ArrayList to hold all the invalid passwords found
illegalPasswords = new ArrayList();

String errorMessage = null;
for(int i = 0; i < passwords.size(); i++)
{
try
{
isValidPassword(passwords.get(i));
}
catch (LengthException e)
{
errorMessage = passwords.get(i) + " The password must be at least 8 characters
long.";
}
errorMessage = passwords.get(i) + " The password must contain at least one digit.";
}
uppercase alphabetic character.";
}
lowercase alphabetic character.";
}
errorMessage = passwords.get(i) + " The password cannot contain more than two of
the same character in sequence.";
}
}

//Return the ArrayList that contains all the invalid passwords only
return illegalPasswords;
}
}
PasswordCheckerInterface.java
public interface PasswordCheckerInterface {
/**
* Will check the validity of the password passed in, and returns true if the password is valid,
or throws an exception if invalid.
*/
InvalidSequenceException;
/**
passwords.
*/
public ArrayList validPasswords (ArrayList passwords);
}
NoDigitException.java
public class NoDigitException extends Exception {
public NoDigitException()
{
}
/**
* Constructor that will take in a message, which will be displayed if NoDigitException is
thrown.
*/
public NoDigitException(String message)
{

super(message);
}
}
LengthException.java
public class LengthException extends Exception
{
public LengthException()
{
}
/**
* Constructor that will take in a message, which will be displayed if LengthException is
thrown.
*/
public LengthException(String message)
{
super(message);
}
}
NoUpperAlphaException.java
public class NoUpperAlphaException extends Exception {
public NoUpperAlphaException()
{
}
/**
* Constructor that will take in a message, which will be displayed if NoUpperAlphaException
is thrown.
*/
public NoUpperAlphaException(String message)
{

super(message);
}
}
NoLowerAlphaException.java
public class NoLowerAlphaException extends Exception {
public NoLowerAlphaException()
{
}
/**
* Constructor that will take in a message, which will be displayed if NoLowerAlphaException
is thrown.
*/
public NoLowerAlphaException(String message)
{
super(message);
}
}
InvalidSequenceException.java
public class InvalidSequenceException extends Exception {
public InvalidSequenceException()
{
}
/**
* Constructor that will take in a message, which will be displayed if
InvalidSequenceException is thrown.
*/
public InvalidSequenceException(String message)
{
super(message);

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