Lwaits's List: SF How-To

• Apex Tutorials
• Force.com Apex Code Developer's Guide

• specify a version of the Salesforce API against which to save your Apex class or trigger.
• indicates not only the version of the Force.com Web services API to use, but which version of Apex as well.
• This version of the managed package will continue to be used by the class or trigger if later versions of the managed package are installed
• You cannot use any of the Apex reserved keywords when naming variables, methods or classes. These include words that are part of Apex and the Force.com platform, such as list, test, or account, as well as reserved keywords.
• Integer, Date, and Boolean, as well as more advanced types such as lists, maps, objects and sObjects
• you must declare the data type of a variable when you first refer to it
• ssign a value to a variable when you declare it. You can also assign values later. Use the following syntax when declaring variables:
• declared with a name and a data type.
• datatype <!--[CDATA[ ]]-->variable_name [ = <!--[CDATA[ ]]-->value];

  •  datatype  variable_name [ =  value];
• The following are examples of variable declarations:

  • Also note that all primitive variables are passed by value, while all non-primitive data types are passed by reference.

  • // The following variable has the data type of Integer with the name Count,       // and has the value of 0.      Integer Count = 0;// The following variable has the data type of Decimal with the name Total. Note       // that no value has been assigned to it.      Decimal Total;// The following variable is an account, which is also referred to as an sObject.      Account MyAcct = new Account();
• A block is a series of statements that are grouped together with curly braces and can be used in any place where a single statement would be allowed

  • if (true) {    System.debug(1);    System.debug(2);} else {    System.debug(3);    System.debug(4);}
• n cases where a block consists of only one statement, the curly braces can be left off. For example:

  • if (true)     System.debug(1);else     System.debug(2);
• A list is a collection of elements, such as Integers, Strings, objects, or other collections. Use a list when the sequence of elements is important. You can have duplicate elements in a list.
• The first index position in a list is always 0.
• xample creates a list of Integer, and assigns it to the variable My_List
• you must declare the data type of My_List as a list of Integer
• A set is a collection of unique, unordered elements.

  • data types, such as String, Integer, Date, and so on.
• he values for the set are passed in using the curly braces {}.
• Use a map when finding something by key matters
• A map is a collection of key-value pairs.
• f statement is a true-false test that enables your application to do different things based on a condition
• loops tell your application to do the same thing again and again based on a condition

  • Apex supports the following types of loops:Do-whileWhileForA Do-while
• For loops that use lists and SOQL queries as part of the condition.

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• Schedulable 

  To invoke Apex classes to run at specific times, first implement the Schedulable interface for the class, then specify the schedule using either the Schedule Apex page in the Salesforce user interface, or the System.schedule method.