To create a Java application that connects to a MySQL database and allows users to perform CRUD operations on an employee table, follow these steps:

1. Install MySQL and create the database schema
2. Add JDBC driver for MySQL to your project
3. Create a Java class to manage database connections
4. Create a Java class to represent Employee objects
5. Create a Java class to handle CRUD operations
6. Implement a user interface or main method to interact with the application

Here's a sample implementation of each step:

1. Install MySQL and create the database schema

After installing MySQL, create a new database and a table named `employees` using the following SQL script:

```sql
CREATE DATABASE company;

USE company;

CREATE TABLE employees (
  id INT AUTO_INCREMENT PRIMARY KEY,
  name VARCHAR(100) NOT NULL,
  position VARCHAR(100) NOT NULL,
  salary DECIMAL(10, 2) NOT NULL
);
```

2. Add JDBC driver for MySQL to your project

Add the following Maven dependency to your `pom.xml` file:

```xml
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>8.0.26</version>
</dependency>
```

3. Create a Java class to manage database connections

```java
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

public class DatabaseConnection {
    private static final String URL = "jdbc:mysql://localhost:3306/company";
    private static final String USER = "root";
    private static final String PASSWORD = "your_password";

    public static Connection getConnection() throws SQLException {
        return DriverManager.getConnection(URL, USER, PASSWORD);
    }
}
```

Replace `"your_password"` with your actual MySQL root password.

4. Create a Java class to represent Employee objects

```java
public class Employee {
    private int id;
    private String name;
    private String position;
    private double salary;

    public Employee(int id, String name, String position, double salary) {
        this.id = id;
        this.name = name;
        this.position = position;
        this.salary = salary;
    }

    // Getters and setters
}
```

5. Create a Java class to handle CRUD operations

```java
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

public class EmployeeDAO {
    public List<Employee> getAllEmployees() throws SQLException {
        List<Employee> employees = new ArrayList<>();
        String query = "SELECT * FROM employees";

        try (Connection connection = DatabaseConnection.getConnection();
             PreparedStatement statement = connection.prepareStatement(query);
             ResultSet resultSet = statement.executeQuery()) {

            while (resultSet.next()) {
                int id = resultSet.getInt("id");
                String name = resultSet.getString("name");
                String position = resultSet.getString("position");
                double salary = resultSet.getDouble("salary");

                employees.add(new Employee(id, name, position, salary));
            }
        }

        return employees;
    }

    public void addEmployee(Employee employee) throws SQLException {
        String query = "INSERT INTO employees (name, position, salary) VALUES (?, ?, ?)";

        try (Connection connection = DatabaseConnection.getConnection();
             PreparedStatement statement = connection.prepareStatement(query)) {

            statement.setString(1, employee.getName());
            statement.setString(2, employee.getPosition());
            statement.setDouble(3, employee.getSalary());

            statement.executeUpdate();
        }
    }

    public void updateEmployee(Employee employee) throws SQLException {
        String query = "UPDATE employees SET name = ?, position = ?, salary = ? WHERE id = ?";

        try (Connection connection = DatabaseConnection.getConnection();
             PreparedStatement statement = connection.prepareStatement(query)) {

            statement.setString(1, employee.getName());
            statement.setString(2, employee.getPosition());
            statement.setDouble(3, employee.getSalary());
            statement.setInt(4, employee.getId());

            statement.executeUpdate();
        }
    }

    public void deleteEmployee(int id) throws SQLException {
        String query = "DELETE FROM employees WHERE id = ?";

        try (Connection connection = DatabaseConnection.getConnection();
             PreparedStatement statement = connection.prepareStatement(query)) {

            statement.setInt(1, id);
            statement.executeUpdate();
        }
    }
}
```

6. Implement a user interface or main method to interact with the application

```java
import java.sql.SQLException;
import java.util.List;

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

        // Add an employee
        Employee newEmployee = new Employee(0, "John Doe", "Software Engineer", 60000);
        try {
            employeeDAO.addEmployee(newEmployee);
            System.out.println("Employee added successfully.");
        } catch (SQLException e) {
            System.err.println("Error adding employee: " + e.getMessage());
        }

        // Get all employees
        try {
            List<Employee> employees = employeeDAO.getAllEmployees();
            for (Employee employee : employees) {
                System.out.println(employee);
            }
        } catch (SQLException e) {
            System.err.println("Error fetching employees: " + e.getMessage());
        }

        // Update an employee
        Employee updatedEmployee = new Employee(1, "Jane Doe", "Senior Software Engineer", 80000);
        try {
            employeeDAO.updateEmployee(updatedEmployee);
            System.out.println("Employee updated successfully.");
        } catch (SQLException e) {
            System.err.println("Error updating employee: " + e.getMessage());
        }

        // Delete an employee
        int employeeIdToDelete = 1;
        try {
            employeeDAO.deleteEmployee(employeeIdToDelete);
            System.out.println("Employee deleted successfully.");
        } catch (SQLException e) {
            System.err.println("Error deleting employee: " + e.getMessage());
        }
    }
}
```

This is a simple example of how to create a Java application that connects to a MySQL database and performs CRUD operations on an employee table. You can extend this code to implement more advanced features or build a user interface for easier interaction with the application.
MySQL 데이터베이스에 연결하고 사용자가 직원 테이블에 대해 CRUD 작업을 수행할 수 있는 Java 애플리케이션을 만들려면 다음 단계를 따르세요.

1. MySQL을 설치하고 데이터베이스 스키마를 생성합니다
2. 프로젝트에 MySQL용 JDBC 드라이버를 추가합니다
3. 데이터베이스 연결을 관리할 Java 클래스를 생성합니다
4. 직원 개체를 나타내는 Java 클래스를 생성합니다
5. CRUD 작업을 처리할 Java 클래스 생성
6. 애플리케이션과 상호 작용하는 사용자 인터페이스 또는 주요 메서드 구현

다음은 각 단계의 샘플 구현입니다.

1. MySQL 설치 및 데이터베이스 스키마 생성

MySQL을 설치한 후 다음 SQL 스크립트를 사용하여 새 데이터베이스와 `employees`라는 테이블을 생성합니다:

```sql
CREATE DATABASE company;

USE company;

CREATE TABLE employees (
  id INT AUTO_INCREMENT PRIMARY KEY,
  name VARCHAR(100) NOT NULL,
  position VARCHAR(100) NOT NULL,
  salary DECIMAL(10, 2) NOT NULL
);
```

2. 프로젝트에 MySQL용 JDBC 드라이버를 추가합니다

다음 Maven 종속성을 `pom.xml` 파일에 추가합니다:

```xml
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>8.0.26</version>
</dependency>
```

3. 데이터베이스 연결을 관리하는 Java 클래스 생성

```java
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

public class DatabaseConnection {
    private static final String URL = "jdbc:mysql://localhost:3306/company";
    private static final String USER = "root";
    private static final String PASSWORD = "your_password";

    public static Connection getConnection() throws SQLException {
        return DriverManager.getConnection(URL, USER, PASSWORD);
    }
}
```

"your_password"`를 실제 MySQL 루트 비밀번호로 바꿉니다.

4. Employee 객체를 나타내는 Java 클래스 만들기

```java
public class Employee {
    private int id;
    private String name;
    private String position;
    private double salary;

    public Employee(int id, String name, String position, double salary) {
        this.id = id;
        this.name = name;
        this.position = position;
        this.salary = salary;
    }

    // Getters and setters
}
```

5. CRUD 작업을 처리하는 Java 클래스 생성

```java
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

public class EmployeeDAO {
    public List<Employee> getAllEmployees() throws SQLException {
        List<Employee> employees = new ArrayList<>();
        String query = "SELECT * FROM employees";

        try (Connection connection = DatabaseConnection.getConnection();
             PreparedStatement statement = connection.prepareStatement(query);
             ResultSet resultSet = statement.executeQuery()) {

            while (resultSet.next()) {
                int id = resultSet.getInt("id");
                String name = resultSet.getString("name");
                String position = resultSet.getString("position");
                double salary = resultSet.getDouble("salary");

                employees.add(new Employee(id, name, position, salary));
            }
        }

        return employees;
    }

    public void addEmployee(Employee employee) throws SQLException {
        String query = "INSERT INTO employees (name, position, salary) VALUES (?, ?, ?)";

        try (Connection connection = DatabaseConnection.getConnection();
             PreparedStatement statement = connection.prepareStatement(query)) {

            statement.setString(1, employee.getName());
            statement.setString(2, employee.getPosition());
            statement.setDouble(3, employee.getSalary());

            statement.executeUpdate();
        }
    }

    public void updateEmployee(Employee employee) throws SQLException {
        String query = "UPDATE employees SET name = ?, position = ?, salary = ? WHERE id = ?";

        try (Connection connection = DatabaseConnection.getConnection();
             PreparedStatement statement = connection.prepareStatement(query)) {

            statement.setString(1, employee.getName());
            statement.setString(2, employee.getPosition());
            statement.setDouble(3, employee.getSalary());
            statement.setInt(4, employee.getId());

            statement.executeUpdate();
        }
    }

    public void deleteEmployee(int id) throws SQLException {
        String query = "DELETE FROM employees WHERE id = ?";

        try (Connection connection = DatabaseConnection.getConnection();
             PreparedStatement statement = connection.prepareStatement(query)) {

            statement.setInt(1, id);
            statement.executeUpdate();
        }
    }
}
```

6. 애플리케이션과 상호 작용하는 사용자 인터페이스 또는 주요 메소드를 구현합니다.

```java
import java.sql.SQLException;
import java.util.List;

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

        // Add an employee
        Employee newEmployee = new Employee(0, "John Doe", "Software Engineer", 60000);
        try {
            employeeDAO.addEmployee(newEmployee);
            System.out.println("Employee added successfully.");
        } catch (SQLException e) {
            System.err.println("Error adding employee: " + e.getMessage());
        }

        // Get all employees
        try {
            List<Employee> employees = employeeDAO.getAllEmployees();
            for (Employee employee : employees) {
                System.out.println(employee);
            }
        } catch (SQLException e) {
            System.err.println("Error fetching employees: " + e.getMessage());
        }

        // Update an employee
        Employee updatedEmployee = new Employee(1, "Jane Doe", "Senior Software Engineer", 80000);
        try {
            employeeDAO.updateEmployee(updatedEmployee);
            System.out.println("Employee updated successfully.");
        } catch (SQLException e) {
            System.err.println("Error updating employee: " + e.getMessage());
        }

        // Delete an employee
        int employeeIdToDelete = 1;
        try {
            employeeDAO.deleteEmployee(employeeIdToDelete);
            System.out.println("Employee deleted successfully.");
        } catch (SQLException e) {
            System.err.println("Error deleting employee: " + e.getMessage());
        }
    }
}
```

다음은 MySQL 데이터베이스에 연결하여 직원 테이블에서 CRUD 작업을 수행하는 Java 애플리케이션을 만드는 방법에 대한 간단한 예입니다. 이 코드를 확장하여 고급 기능을 구현하거나 애플리케이션과 더 쉽게 상호 작용할 수 있는 사용자 인터페이스를 구축할 수 있습니다.