使用Java连接MySQL数据库可以通过以下步骤实现增、删、查操作：

1、导入相关的依赖库。需要引入MySQL数据库的驱动库，可以在项目的build.gradle（或pom.xml）文件中添加如下依赖：

// build.gradledependencies {implementation 'mysql:mysql-connector-java:8.0.26'}

2、创建数据库连接。使用Java中的java.sql.Connection接口来建立和数据库之间的连接，可以使用MySQL提供的com.mysql.cj.jdbc.Driver类来注册数据库驱动。

import java.sql.Connection;import java.sql.DriverManager;public class DatabaseConnection {private static final String URL = "jdbc:mysql://localhost:3306/database_name";private static final String USERNAME = "username";private static final String PASSWORD = "password";public static Connection getConnection() {Connection connection = null;try {Class.forName("com.mysql.cj.jdbc.Driver");connection = DriverManager.getConnection(URL, USERNAME, PASSWORD);System.out.println("Connected to the database successfully.");} catch (Exception e) {e.printStackTrace();}return connection;}}

3、实现增、删、查操作。根据需要实现相应的方法，可以使用java.sql.Statement或java.sql.PreparedStatement来执行SQL语句。

import java.sql.Connection;import java.sql.ResultSet;import java.sql.SQLException;import java.sql.Statement;public class DatabaseOperations {private static final String TABLE_NAME = "table_name";public static void insertData(String data) {try {Connection connection = DatabaseConnection.getConnection();Statement statement = connection.createStatement();String sql = "INSERT INTO " + TABLE_NAME + " (column_name) VALUES ('" + data + "')";statement.executeUpdate(sql);System.out.println("Data inserted successfully.");} catch (SQLException e) {e.printStackTrace();}}public static void deleteData(int id) {try {Connection connection = DatabaseConnection.getConnection();Statement statement = connection.createStatement();String sql = "DELETE FROM " + TABLE_NAME + " WHERE id = " + id;statement.executeUpdate(sql);System.out.println("Data deleted successfully.");} catch (SQLException e) {e.printStackTrace();}}public static void retrieveData() {try {Connection connection = DatabaseConnection.getConnection();Statement statement = connection.createStatement();String sql = "SELECT * FROM " + TABLE_NAME;ResultSet resultSet = statement.executeQuery(sql);while (resultSet.next()) {int id = resultSet.getInt("id");String data = resultSet.getString("column_name");System.out.println("ID: " + id + ", Data: " + data);}} catch (SQLException e) {e.printStackTrace();}}}

在上述代码中，TABLE_NAME是数据库表的名称，column_name是要进行操作的具体列名。

注意：在实际开发中，需要根据具体情况进行异常处理和资源释放，例如在finally块中关闭连接、释放资源。

以上就是使用Java连接MySQL数据库实现增、删、查操作的基本步骤。可以根据具体需求进行修改和扩展。