RankManager.java

public class rankmanager implements Listener{
       
        //Fix your cases!
        main plugin;
        dbutils dbutils;
        ranktypes ranktypes = new ranktypes();
       
       
        public rankmanager(main plugin, dbutils dbutils){
                this.plugin = plugin;
                this.dbutils = dbutils;
        }
       		//Update to support UUID's ASAP! DOn't use string! (hint: player.getUniqueId().toString();)
       		//UUID's fit nicely in a VARCHAR(36)
                @SuppressWarnings("unused")
                public void setRank(String player, rankTypes rank) {
                        try {
                                dbutils.updateSQL("UPDATE player_account SET rank=" + rank.getId() + " WHERE player='" + player + "';");
                        } catch (SQLException e) {
                                e.printStackTrace();
                }
        }
}

RankTypes.java

public enum RankTypes{
        DEFAULT(0),
               
        PAID1(1),
        PAID2(2),
               
        HELPER(3),
        SRMOD(4),
        MOD(5),
               
        BUILDER(6),
        DEVELOPER(7),
        ADMIN(8),
        OWNER(9),
        FOUNDER(10);
        
        private int id;
                
        private RankTypes(int id) {
        	this.id = id;
        }

	public int getId() {
		return this.id;
	}
}