Password Manager.java

import java.util.ArrayList;
import java.util.Scanner;

class PasswordEntry {
    private String website;
    private String username;
    private String password;

    public PasswordEntry(String website, String username, String password) {
        this.website = website;
        this.username = username;
        this.password = password;
    }

    // Getters and setters for password entry details
}

public class PasswordManagerApp {
    private static ArrayList<PasswordEntry> passwordEntries = new ArrayList<>();
    private static String masterPassword;

    public static void main(String[] args) {
        // Implement a login system using the master password
        // If the user logs in successfully, proceed to the password manager interface

        Scanner scanner = new Scanner(System.in);

        while (true) {
            displayMenu();
            int choice = scanner.nextInt();
            scanner.nextLine();  // Consume newline character

            switch (choice) {
                case 1:
                    addPasswordEntry(scanner);
                    break;
                case 2:
                    viewPasswordEntries();
                    break;
                case 3:
                    generatePassword(scanner);
                    break;
                case 4:
                    changeMasterPassword(scanner);
                    break;
                case 5:
                    System.out.println("Goodbye!");
                    System.exit(0);
                default:
                    System.out.println("Invalid choice. Please try again.");
            }
        }
    }

    // Implement methods for adding, viewing, generating, and managing password entries

    private static void displayMenu() {
        System.out.println("\nPassword Manager");
        System.out.println("1. Add a new password entry");
        System.out.println("2. View password entries");
        System.out.println("3. Generate a new password");
        System.out.println("4. Change master password");
        System.out.println("5. Exit");
        System.out.print("Enter your choice: ");
    }
}