Apex Conditional Logic

Of course, like all programming languages, Apex includes syntax to implement conditional logic, otherwise known as IF – THEN – ELSE logic.

The basic format for this type of code is the following:

if (Boolean_expression)
 Statement;
 else
 Statement;

Note that the Boolean must be within parentheses, even if it is a simple expression, and you need to have semi-colons to indicate the end of each statement in the conditional logic.

The form shown above includes a single statement for each condition. Normally, you create multiple statements for a condition, requiring the use of curly braces to group the statements, as in the following:

if (Boolean_expression){
 statement;
 statement;
 statement;
 statement;}
else {
 statement;
 statement;}

You can nest if statements, giving syntax similar to the following:

if (Location.Name == 'Toronto'){
 Location.country__c = 'Canada';
       }
else if {(Location.Name == 'London'){
 Location.country__c = 'United Kingdom';
       }
else {
 Location.country__c = 'United States';
 }