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ITP Data Rep - Class3

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This document provides an overview of data representation, focusing on collections such as arrays, ArrayLists, and HashMaps. It discusses the creation and usage of these data structures in programming, particularly with a class named 'feelingobject' and examples of how to manipulate ArrayLists and HashMaps. Key comparisons between arrays and ArrayLists are made, along with insights into employing generics in ArrayLists and the utility of HashMaps for storing objects by key.

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Data Representation Day 3
2. Parse the data into useful Objects
Collections - Arrays, ArrayLists, Objects & Hashmaps
ITP Data Rep - Class3
WFF screenshot
API
Application Programming Interface
class FeelingObject { String feeling; String sentence; XML String gender; FeelingObject(); }
class FeelingObject { class FeelingObject { class FeelingObject { class FeelingObject { XML String feeling; String feeling; String feeling; String feeling; String sentence; String sentence; String sentence; String sentence; String gender; String gender; String gender; String gender; FeelingObject(); FeelingObject(); FeelingObject(); FeelingObject(); } } } }
class FeelingObject { class FeelingObject { class FeelingObject { class FeelingObject { String feeling; String feeling; String feeling; String feeling; String sentence; String sentence; String sentence; String sentence; String gender; String gender; String gender; String gender; FeelingObject(); FeelingObject(); FeelingObject(); FeelingObject(); } } } } class FeelingObject { class FeelingObject { class FeelingObject { class FeelingObject { String feeling; String feeling; String feeling; String feeling; String sentence; String sentence; String sentence; String sentence; String gender; String gender; String gender; String gender; FeelingObject(); FeelingObject(); FeelingObject(); FeelingObject(); } } } } class FeelingObject { class FeelingObject { class FeelingObject { class FeelingObject { XML String feeling; String feeling; String feeling; String feeling; String sentence; String sentence; String sentence; String sentence; String gender; String gender; String gender; String gender; FeelingObject(); FeelingObject(); FeelingObject(); FeelingObject(); } } } } class FeelingObject { class FeelingObject { class FeelingObject { class FeelingObject { String feeling; String feeling; String feeling; String feeling; String sentence; String sentence; String sentence; String sentence; String gender; String gender; String gender; String gender; FeelingObject(); FeelingObject(); FeelingObject(); FeelingObject(); } } } } class FeelingObject { class FeelingObject { class FeelingObject { class FeelingObject { String feeling; String feeling; String feeling; String feeling; String sentence; String sentence; String sentence; String sentence; String gender; String gender; String gender; String gender; FeelingObject(); FeelingObject(); FeelingObject(); FeelingObject(); } } } }
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Arrays vs. ArrayLists
Arrays vs. ArrayLists
Arrays fast easy to use good for known quantities
ArrayLists flexible full-featured good for changing quantities
Basic ArrayLists ArrayList myList = new ArrayList(); CheeseBurger cb = new CheeseBurger(); myList.add(cb);
Basic ArrayLists CheeseBurger cb = myList.get(0); cb.eat();
Basic ArrayLists CheeseBurger cb = myList.get(0); X cb.eat();
Basic ArrayLists CheeseBurger cb = (CheeseBurger) myList.get(0); cb.eat();
ArrayLists w/ Generics ArrayList<CheeseBurger> myList = new ArrayList(); CheeseBurger cb = new CheeseBurger(); myList.add(cb);
ArrayLists w/ Generics CheeseBurger cb = myList.get(0); √ cb.eat();
HashMaps
HashMaps Store objects by a key Helpful for keeping counts of categories Useful for keeping checklists
HashMaps HashMap<keyType, valueType> myMap = new HashMap(); CustomObject o = new CustomObject(); myMap.put(key, o); CustomObject o = myMap.get(key)

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ITP Data Rep - Class3

  • 2. 2. Parse the data into useful Objects
  • 3. Collections - Arrays, ArrayLists, Objects & Hashmaps
  • 6. API
  • 8. class FeelingObject { String feeling; String sentence; XML String gender; FeelingObject(); }
  • 9. class FeelingObject { class FeelingObject { class FeelingObject { class FeelingObject { XML String feeling; String feeling; String feeling; String feeling; String sentence; String sentence; String sentence; String sentence; String gender; String gender; String gender; String gender; FeelingObject(); FeelingObject(); FeelingObject(); FeelingObject(); } } } }
  • 10. class FeelingObject { class FeelingObject { class FeelingObject { class FeelingObject { String feeling; String feeling; String feeling; String feeling; String sentence; String sentence; String sentence; String sentence; String gender; String gender; String gender; String gender; FeelingObject(); FeelingObject(); FeelingObject(); FeelingObject(); } } } } class FeelingObject { class FeelingObject { class FeelingObject { class FeelingObject { String feeling; String feeling; String feeling; String feeling; String sentence; String sentence; String sentence; String sentence; String gender; String gender; String gender; String gender; FeelingObject(); FeelingObject(); FeelingObject(); FeelingObject(); } } } } class FeelingObject { class FeelingObject { class FeelingObject { class FeelingObject { XML String feeling; String feeling; String feeling; String feeling; String sentence; String sentence; String sentence; String sentence; String gender; String gender; String gender; String gender; FeelingObject(); FeelingObject(); FeelingObject(); FeelingObject(); } } } } class FeelingObject { class FeelingObject { class FeelingObject { class FeelingObject { String feeling; String feeling; String feeling; String feeling; String sentence; String sentence; String sentence; String sentence; String gender; String gender; String gender; String gender; FeelingObject(); FeelingObject(); FeelingObject(); FeelingObject(); } } } } class FeelingObject { class FeelingObject { class FeelingObject { class FeelingObject { String feeling; String feeling; String feeling; String feeling; String sentence; String sentence; String sentence; String sentence; String gender; String gender; String gender; String gender; FeelingObject(); FeelingObject(); FeelingObject(); FeelingObject(); } } } }
  • 11. class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class XML class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class
  • 12. class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class ArrayList feelingList = class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class class
  • 15. Arrays fast easy to use good for known quantities
  • 16. ArrayLists flexible full-featured good for changing quantities
  • 17. Basic ArrayLists ArrayList myList = new ArrayList(); CheeseBurger cb = new CheeseBurger(); myList.add(cb);
  • 18. Basic ArrayLists CheeseBurger cb = myList.get(0); cb.eat();
  • 19. Basic ArrayLists CheeseBurger cb = myList.get(0); X cb.eat();
  • 20. Basic ArrayLists CheeseBurger cb = (CheeseBurger) myList.get(0); cb.eat();
  • 21. ArrayLists w/ Generics ArrayList<CheeseBurger> myList = new ArrayList(); CheeseBurger cb = new CheeseBurger(); myList.add(cb);
  • 22. ArrayLists w/ Generics CheeseBurger cb = myList.get(0); √ cb.eat();
  • 24. HashMaps Store objects by a key Helpful for keeping counts of categories Useful for keeping checklists
  • 25. HashMaps HashMap<keyType, valueType> myMap = new HashMap(); CustomObject o = new CustomObject(); myMap.put(key, o); CustomObject o = myMap.get(key)

Editor's Notes