public class TimeSpan {    Date date;    String start;    String end;}public class Table {    int tableid;    String type;    HashMap<Date,HashMap<String,String>> reserved;    public boolean isFitToRequest(Request ts){        return false;    }}public class Request {    String name;    String phone_number;    TimeSpan ts;    Date date;    int seats;        public boolean isFitToRequest(Table table){        return false;            }}public class Restaurant {    Rinfo rInfo;    TableManager tm;}class Rinfo{    String name;    String add;    String phoneno;}public class TableManager {   HashMap<Integer,Table> map_tablse;   ArrayList<Table> tables;   ArrayList<Request> waitingList;      private int numofTable;   private int numberofLarge;   private int numberofMedium;   private int numberofSmall;      public TableManager(){          }      public synchronized void reserveResult(Request r){       if(processRequest(r)){           System.out.println("Successed!");       }else{           System.out.println("You are on the waiting list");       }   }   private boolean processRequest(Request r){      for(Table table : tables){          if(r.isFitToRequest(table)){              update(table,r);              return true;          }          else               continue;      }      return false;   }      public void update(Table table, Request r){}      }