java - Object Oriented Design/How to set up class structure -

i new object oriented programming , curious know @ high level how solve problem.

if have list of different calendars i.e. work calendar, personal calendar, sports calendars, etc , each of them have there own respective events. assume have calendar class , nested class event class. since want display of events calendars on 1 list go on sorted array. lets wanted delete 1 of calendars work calendar how ensure work events deleted list/array. curious how class structure set @ high level. appreciated.

here how go it, highlighted parts pick on:

if have list of different calendars i.e. work calendar, personal calendar, sports calendars, etc , each of them have there own respective events. since want display of events calendars on 1 list go on sorted array. lets wanted delete 1 of calendars work calendar how ensure work events deleted list/array.

that gives me:

emum calendartype {     work,     personal,     sport, }  class event {     // event data, time, place, people, etc...     private calendar owner; }  class calendar {     private calendartype type; // or make string , rid of enum                                 // if people can make own types     private list<event> event;s } 

the part wanting have events in single list , delete them when calendar bit harder.

i think add method in calendarutils class:

public static void deleteevents(calendar c, list<event> events) {     // loop through events, each 1 calendar remove }