public class Main {

private static final String URL = "jdbc:mysql://localhost:3306/mydbtest?useSSL=false";
private static final String LOGIN = "root";
private static final String PASSWORD = "root";

public static void main(String[] args) {
    Connection connection = null;
    try {

        connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydbtest?useSSL=false", "root", "root");
        if(!connection.isClosed()){
            System.out.println("TRUE");
        }
    } catch (SQLException e) {
        System.err.println("Невозможно подлючиться к БД!");
    }

}