public static final String DB_DRIVER = "com.mysql.jdbc.Driver";
public static final String DB_CONNECTION = "jdbc:mysql://localhost:3306/myDatabase";
public static final String DB_USER = "root";
public static final String DB_PASSWORD = "password";

try {
    Class.forName(Database.DB_DRIVER);
} catch (ClassNotFoundException e) {
    System.out.println(e);
}

Connection connection = null;
try {
    connection = DriverManager.getConnection(Database.DB_CONNECTION,
                Database.DB_USER,
                Database.DB_PASSWORD);
} catch (SQLException e) {
    System.out.println(e);
}

try {
    PreparedStatement preparedStatement = connection.prepareStatement("SELECT * FROM USERS WHERE USER_NAME = ?");
    preparedStatement.setString(1, "Alex");
    ResultSet rs = preparedStatement.executeQuery();
    while (rs.next()) {
        String result = rs.getString("USER_NAME")
        System.out.println(result);
    }
} catch (SQLException ex) {
    System.out.println(ex);
}