Kunci untuk meningkatkan tahap pembangunan Java: Menguasai tindanan teknologi Java

public class MyRunnable implements Runnable {
    public void run() {
        for (int i = 0; i < 10; i++) {
            System.out.println(Thread.currentThread().getName() + ": " + i);
        }
    }
}

public class Main {
    public static void main(String[] args) {
        MyRunnable myRunnable = new MyRunnable();
        
        Thread t1 = new Thread(myRunnable);
        Thread t2 = new Thread(myRunnable);
        
        t1.start();
        t2.start();
    }
}

public class Main {
    public static void main(String[] args) {
        try {
            FileInputStream fileInputStream = new FileInputStream("file.txt");
            InputStreamReader inputStreamReader = new InputStreamReader(fileInputStream);
            BufferedReader bufferedReader = new BufferedReader(inputStreamReader);

            String line;
            while ((line = bufferedReader.readLine()) != null) {
                System.out.println(line);
            }

            bufferedReader.close();
            inputStreamReader.close();
            fileInputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

public class Main {
    private UserService userService;

    public void setUserService(UserService userService) {
        this.userService = userService;
    }

    public void run() {
        String username = "John";
        User user = userService.getUserByUsername(username);
        System.out.println(user);
    }

    public static void main(String[] args) {
        ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        Main main = (Main) context.getBean("main");
        main.run();
    }
}

@Entity
@Table(name = "user")
public class User {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private int id;
    
    @Column(name = "username")
    private String username;
    
    @Column(name = "password")
    private String password;
    
    // Getters and setters
}

public class Main {
    public static void main(String[] args) {
        SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory();
        Session session = sessionFactory.openSession();
        Transaction transaction = session.beginTransaction();
        
        User user = new User();
        user.setUsername("John");
        user.setPassword("123456");
        
        session.save(user);
        
        transaction.commit();
        session.close();
        sessionFactory.close();
    }
}

<project>
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.example</groupId>
    <artifactId>my-project</artifactId>
    <version>1.0.0</version>
    
    <dependencies>
        <dependency>
            <groupId>com.example</groupId>
            <artifactId>my-library</artifactId>
            <version>1.0.0</version>
        </dependency>
    </dependencies>
</project>

git init
git add .
git commit -m "Initial commit"

git branch new-feature
git checkout new-feature