What frameworks are suitable for Java beginners to practice?

For Java beginners, the best frameworks to learn include: Spring Boot: Simplifying fast web application building for the Spring ecosystem. Hibernate: An ORM framework that simplifies database interaction. JUnit: unit testing framework to verify code correctness. Mockito: A mocking framework that isolates object behavior and focuses on business logic.

The best learning framework for Java beginners

For Java beginners, it is very important to choose the right framework. Provides basic functionality while helping to develop a solid foundation. This article will introduce some frameworks suitable for beginners and provide practical cases to help understand.

1. Spring Boot

Spring Boot is a Java-based framework that simplifies the use of the Spring ecosystem and is ideal for quickly building web applications. It provides a rich set of APIs covering everything from data access to security management.

Practical case: Use Spring Boot to create a simple REST API

@SpringBootApplication
public class RestApiApplication {
    public static void main(String[] args) {
        SpringApplication.run(RestApiApplication.class, args);
    }
}

@RestController
@RequestMapping("/api/v1")
public class UserController {

    private final UserService userService;

    public UserController(UserService userService) {
        this.userService = userService;
    }

    @GetMapping("/users")
    public List<User> getAllUsers() {
        return userService.findAll();
    }

    @PostMapping("/users")
    public User createUser(@RequestBody User user) {
        return userService.create(user);
    }
}

2. Hibernate

Hibernate is an object -The relational mapping (ORM) framework provides a lightweight way to interact with the database. It allows developers to use Java objects and collections to manipulate databases, eliminating tedious SQL queries and updates.

Practical case: Using Hibernate to access the database

Session session = sessionFactory.openSession();
Transaction transaction = session.beginTransaction();

User user = new User();
user.setName("John Doe");
session.save(user);

transaction.commit();

3. JUnit

JUnit is a unit testing framework for Verify the correctness of Java code. It provides rich assertions and matchers to help developers easily write and run unit tests.

Practical case: Writing JUnit tests to verify user creation methods

@ExtendWith(SpringExtension.class)
@DataJpaTest
class UserControllerTest {

    @Autowired
    private UserService userService;

    @Test
    void createUser() {
        User user = new User();
        user.setName("John Doe");

        User createdUser = userService.create(user);

        assertThat(createdUser).isNotNull();
        assertThat(createdUser.getName()).isEqualTo("John Doe");
    }
}

4. Mockito

Mockito is a powerful A mocking framework for creating mock objects and validating method calls. It allows developers to isolate the behavior of objects and focus on the business logic in their code.

Practical Example: Mock User Services to Test Controllers

@ExtendWith(SpringExtension.class)
@DataJpaTest
class UserControllerTest {

    @Autowired
    private UserService userService;

    @Mock
    private UserService mockUserService;

    @InjectMocks
    private UserController controller;

    @Test
    void createUser() {
        User user = new User();
        user.setName("John Doe");

        when(mockUserService.create(user)).thenReturn(user);

        User createdUser = controller.createUser(user);

        assertThat(createdUser).isNotNull();
        assertThat(createdUser.getName()).isEqualTo("John Doe");
        verify(mockUserService).create(user);
    }
}

These frameworks provide a solid foundation for Java beginners to create robust, maintainable app. Through these practical cases, developers can gain an in-depth understanding of how the framework is used and easily navigate the Java ecosystem.

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