Code Migration Tool

How to Use This Tool

1. Enter the Old Code: Paste your existing code into the "Old Code" textarea provided. You can use the example Java 8 code below, or any code/language.
2. Specify the Target Version: Indicate the version number you want to migrate your code to in the "Target Version" input field. For example, Java 17.
3. Submit the Form: Click the "Submit" button to start the migration process. A spinner will appear indicating the processing.
4. View the Migrated Code: Once the process is complete, the new migrated code will be displayed on the page.
5. Review Changes: The tool will also show a summary of changes made during the migration.
6. Generate Unit Test Cases: Click the "Generate Unit Test Cases" button to create unit test cases for the new code. A spinner will appear while the test cases are being generated.
7. View Test Cases: Once the test cases are generated, they will be displayed below.

Example Java 8 Code:

import java.util.ArrayList;
import java.util.List;
import java.util.Optional;

class Database {
    private List users = new ArrayList<>();

    public Database() {
        // Initialize the database with some mock data
        users.add(new User(1, "John Doe"));
        users.add(new User(2, "Jane Doe"));
    }

    public Optional getUserById(int id) {
        return users.stream()
                    .filter(user -> user.getId() == id)
                    .findFirst();
    }

    public List getAllUsers() {
        return new ArrayList<>(users);
    }

    public void updateUser(User user) {
        this.getUserById(user.getId()).ifPresent(u -> {
            u.setName(user.getName());
            System.out.println("Updated user: " + u);
        });
    }
}

class User {
    private int id;
    private String name;

    public User(int id, String name) {
        this.id = id;
        this.name = name;
    }

    public int getId() {
        return id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    @Override
    public String toString() {
        return "User{id=" + id + ", name='" + name + '\'' + '}';
    }
}

public class Main {
    public static void main(String[] args) {
        Database db = new Database();

        // Fetch all users
        List users = db.getAllUsers();
        System.out.println("All users:");
        users.forEach(System.out::println);

        // Fetch a single user by ID
        Optional user = db.getUserById(1);
        user.ifPresent(u -> System.out.println("Fetched user: " + u));

        // Update a user
        user.ifPresent(u -> {
            u.setName("John Smith");
            db.updateUser(u);
        });

        // Verify update
        user = db.getUserById(1);
        user.ifPresent(u -> System.out.println("Updated user: " + u));
    }