apex

Question 1

hosted

Answer 1

apex is saved, compiled, and executed on the server - the lightning platform

Question 2

object oriented

Answer 2

apex supports classes, interfaces, and inheritance

Question 3

strongly typed

Answer 3

apex validates references to objects at compile time

Question 4

multitenant aware

Answer 4

because apex runs in a multitenant platform, it guards closely against runaway code by enforcing limits, which prevent code from monopolizing shared resources

Question 5

integrated with the database

Answer 5

it is straightforward to access and manipulate records. apex provides direct access to records and their fields, and provides statements and query languages to manipulate those records.

Question 6

data focused

Answer 6

apex provides transactional access to the database, allowing you to rollback operations

Question 7

easy to use

Answer 7

apex is based on familiar java idioms

Question 8

easy to test

Answer 8

apex provides built-in support for unit test creation, execution, and code coverage. salesforce ensures that all custom apex code works as expected by executing all unit tests to any platform upgrades

Question 9

versioned

Answer 9

custom apex code can be saved against different versions of the API

Question 10

apex supports

Answer 10

• classes, interfaces, properties, and collections (including arrays)
• object and array notation
• expressions, variables, and constants
• conditionals and control flow

Question 11

UNLIKE other OOP languages, apex supports:

Answer 11

• cloud development as Apex is stored, compiled, and executed in the cloud
• triggers, which are similar to triggers in DB systems
• transactions and rollbacks
• the global access modifier, which is more permissive than the public modifier and allows access across namespaces and applications
• versioning of custom code

Question 12

case

Answer 12

apex is a case-insensitive language

Question 13

Apex data types

Answer 13

primitives: Integer, Double, Long, Date, Datetime, String, ID, Boolean, etc.

sObject: either as a generic sObject or as a specific sObject, such as an Account, Contact, or MyCustomObject__c

collection: list/array of primitives, sObjects, user defined objects, objects created from Apex classes, or collections; a set of primitives; a map from a primitive to primitive, sObject, or collection
enum: typed list of values

user-defined Apex classes

system-supplied apex classes

Question 14

the following DML statements are available

Answer 14

insert
update
upsert
delete
undelete
merge

Question 15

upsert

Answer 15

creates new records and updates sObject records within a single statement, using a specified field to determine the presence of existing objects, or the ID field if no field is specified

Question 16

merge

Answer 16

merges up to three records of the same sObject type into one of the records, deleting the others, and parenting any related records