Mysql Class

package de.proxysocke.net.joey.joeyvotesystem.Database;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.text.MessageFormat;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class MySQLManager {

	    public static String host = "localhost";
	    public static String port = "3306";
	    public static String database = "devserver";
	    public static String username = "devserver";
	    public static String password = "EvcJJlrBNf0JF251";
	    public static Connection con;

	    private static ExecutorService mservice = Executors.newCachedThreadPool();

	    public static void connect(){

	    	if(isConnectet() == false){

	    		try {

	    			String url = MessageFormat.format("jdbc:mysql://{0}:{1}/{2}", host, port, database);

					con = DriverManager.getConnection(url, username, password);

					System.out.println("[JoeyMySQLManager @JoeyVoteSystem] Verbindung wurde hergestellt");

				} catch (SQLException e) {

					e.printStackTrace();
				}

	    	}

	    }

	    public static void checkConnection(){

	    	if(!isConnectet()){

	    		connect();

	    	}

	    }


	    public static void disconect(){

	    	if(isConnectet() == true){

	    		try {
					con.close();
					System.out.println("[JoeyMySQLManager @JoeyVoteSystem] Verbindung wurde getrennt");
				} catch (SQLException e) {

					e.printStackTrace();
				}

	    	}

	    }

	    public static void UpdateAsync(final PreparedStatement statement){

	    	mservice.execute(()-> {
				try {
					update(statement);
				} catch (SQLException e) {

					e.printStackTrace();
				}
			});

	    }

		private static void update(PreparedStatement statement) throws SQLException{

	    	if(isConnectet() == true){

	    		statement.executeUpdate();
	    		statement.close();

	    	}

	    }

	    private static boolean isConnectet(){

	      if(con == null){

	    	  return false;

	      } else {

	    	  return true;

	      }

	    }

	    public static Connection getConnection(){

	    	return con;

	    }

    }