Apex Data Types include:

• Primitive
• Enum
• sObject
• Collection

Primitive Data Types:

Include the following:

• Boolean
• Date
• Date/Time
• Time
• ID
• Integer
• Long
• Double
• Decimal
• String
• Blob
• Object

Enum Data Types

• Is an abstract data type that allows you to store the values of a finite set of identifiers
• Defined using the keyword ‘enum’
• Built-in enums viz. System.StatusCode returns API error codes
• Some enum methods:
  • Values() – returns a list of values for the enum
  • Name() – returns the name of the enum

sObject Data Types

• Represents Objects (Standard and Custom) in Salesforce.com
• Can be either strongly typed or loosely typed
• Initialized to null by default
• Can be instantiated with <name, value> pairs
• Possible to declare variables of generic sObject data types. e.g.
  • sObject obj = new Account(); //obj instantiation
  • Account acct = (Account)obj; // type-casting
  • sObject[] acc = new Account[0];
  • List<Account> accnt = List<Account> acc; //List of Accounts

Collection Data Types

Three different collections: List, Set, Map

• A List is an ordered collection of a single type
  • List<Integer> iList = new List<Integer>(); iList.add(1); iList.add(‘String’); // not allowed
  • Supports common methods like add, remove, clear, get, sort, isEmpty, size
• A Set is an un-ordered collection of unique data
  • Set<Integer> iSet = new Set<Integer>(); iSet.add(1); iSet.add(2); iSet.add(3); iSet.add(2); //not allowed
  • Supports common methods like add, remove, clear, get, sort, isEmpty, size, remove, removeAll, contains, containsAll
• A Map (Hash-Map) is an un-ordered collection of unique keys that map to single values
  • <Key, Value> pair
  • Keys and Values can be of any data type including other collections from the above list
  • Often used to map ID’s to sObjects
  • Supports common methods like add, remove, clear, get, sort, isEmpty, size, remove, removeAll, contains, containsAll, containsKey, keySet, values, put, putAll
  • Map<Integer, String> map = new Map<Integer, String>();  map.put(1, ‘One’); map.put(2, ‘Two’);

 
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