Apex Code 33%

Question 1

What does it mean that Apex is an integrated language?

Answer 1

That DML SOQL, SOSL are all integrated and can be used in the code.

Question 2

What does it mean that Apex is a strongly typed language?

Answer 2

That variables must be declared with a datatype.

int a = 10;

Question 3

Apex or Point and Click:

1. Create Web services
2. Create email services
3. Perform complex validation over multiple objects
4. Create complex business processes that are not supported by workflow

Answer 3

1. Apex
2. Apex
3. Apex
4. Apex

Question 4

Apex or Point and Click:
Create custom transactional logic (logic that occurs over the entire transaction, not just with a single record or object)

Answer 4

Apex

Question 5

Apex or Point and Click:
Attach custom logic to another operation, such as saving a record, so that it occurs whenever the operation is executed, regardless of whether it originates in the UI, a VF page or from the Web Services API.

Answer 5

Apex

Question 6

True/False: All variables in Apex allow null as a value and are initialized to null if they are not assigned another value.

Answer 6

True.

Question 7

In Apex, all variables and expressions have a data type. What are the five kinds of data types in Apex?

Answer 7

1. Primitives (int, String)
2. sObject
3. Collections (Set, List, Map)
4. Objects created from user-defined or system-defined apex classes
5. Enums

Question 8

True/False: Lists:

1. Lists contain implicit keys, explicit values
2. Is not ordered
3. Values must be unique
4. Useful for storing the results of a DB query

Answer 8

1. True
2. False - Lists have ordered values
3. False
4. True

Question 9

True/False: Maps:

1. Maps contain key, value - pairs
2. Is not ordered
3. Values must be unique
4. Useful for caching records indexed by ID

Answer 9

1. True
2. True
3. False - Keys must be unique
4. True

Question 10

True/False: Sets:

1. Sets contain values
2. Is not ordered
3. Values must be unique
4. Useful as a lookup criteria for relationship-based SOQL query

Answer 10

1. True
2. True
3. True
4. True

Question 11

True/False: Lists can only contain Primitives and sObjects.

Answer 11

False.

Lists can contain Primitives, sObjects, objects created from Apex classes and collections.

Question 12

True/False: Sets can only contain sObjects.

Answer 12

False.

Sets can only contain primitives.

Question 13

True/False: the key, value pair of Maps can be:

1. Primitive to Primitive
2. Primitive to sObject
3. Primitive to Collection

Answer 13

1. True
2. True
3. True

Question 14

Apex classes: What is the difference between:

1. private myClass
2. public myClass
3. global myClass

Answer 14

1. Classes cannot be referenced by any Apex code outside of the class in which they are defined.
2. Classes can be called within the same org.
3. Classes can be called by all Apex code everywhere. (e.g. webservices)

Question 15

Apex classes: What is the difference between:

1. public virtual myClass
2. public abstract myClass

Answer 15

1. Apex supports virtual classes and methods. use "extend" to subclass a virtual class.
Note, methods derived from a virtual class can be overridden, but doesn't have to be.
2. Apex supports abstract classes. Methods are defined, but implemented in the subclass.
Note, methods derived from an abstract class must be overridden.

Question 16

Apex classes: What is the difference between:

1. public with sharing myClass
2. public without sharing myClass

Answer 16

1. With sharing or user context limits the code to access the records that the user executing the code has access to - respects the sharing model.
2. Without sharing or system context - default - allows the code to access all records. - ignores the sharing model.

Question 17

True/False: A class can only extend one other class, but can implement more than one interface.

Answer 17

True.

Question 18

True/False: User-defined methods can be polymorphic.

Answer 18

True.

A method named myMethod can be implemented two times with a different number of parameters.

Question 19

True/False: User-defined methods can be declared as static when defined in a Trigger.

Answer 19

False.

Question 20

True/False: In Apex, all classes and methods are final by default. By default, classes may not be extended to create sub-classes, and methods may not be overridden within sub-classes.

Answer 20

True.

Question 21

True/False: A class cannot have a more restrictive access modifier than one of its methods or attributes.

Answer 21

True.

Question 22

True/False:

1. Only classes that are extending from virtual or abstract classes can use super
2. You can only use super in methods that are designated with the override keyword.

Answer 22

1. True

2. True

Question 23

What does the final keyword mean?

Answer 23

Constants that are defined using the final keyword can be assigned at most once, either in the declaration itself or with a static initializer method if the constant is defined in a class.

Question 24

What is a statement in Apex?

Answer 24

Any coded instruction that performs an action. I.E. Loops, Locking, DML calls, Transaction Control etc.

Question 25

True/False: Classes with @isTest annotation can only contain test methods.

Answer 25

True

Question 26

What is the advantage of having a separate class for testing?

Answer 26

Classes defined with @isTest doesn't count against the limits. Note, you can also add the @isTest annotation to methods inside normal classes.

Question 27

True/False: If you update or delete a record in its before trigger, or delete a record in its after trigger, you will receive a runtime error.

Answer 27

True.

Question 28

Given the following scenario: You update account A, and the before update trigger of account A inserts contact B, and the after insert trigger of contact B queries for account A and updates it using the DML update statement or database method. What will happen?

Answer 28

runtime error. | You are indirectly updating account A in its before trigger.

Question 29

Mention 3 ways Apex can be invoked.

Answer 29

1. Anonymous block. 2. A trigger invoked for specified events. 3. Asynchronous Apex by executing a future method, scheduling an Apex class to run at specified intervals, or running a batch job. 4. Apex Web Services, which allow exposing your methods via SOAP and REST Web services. 5. Apex Email Service to process inbound email. 6. Visualforce controllers, which contain logic in Apex for Visualforce pages. 7. The Ajax toolkit to invoke Web service methods implemented in Apex.

Question 30

True/False: To handle incoming emails two tasks must be performed. 1. Create an Apex class that implements an interface for the Emails. 2. Setup and enable the interface through the Email Services Page.

Answer 30

True

Question 31

Which interface must be implemented when implementing an inbound email service?

Answer 31

Messaging.IndboundEmailHandler

Question 32

What can be the cause of the message: MASS_MAIL_LIMIT_EXCEEDED.

Answer 32

The limit is hit either by sending to many emails in one transaction or by sending to many emails during a day.

Question 33

What does the following two methods in the Messaging.sendEmailMessage do: 1. setDocumentAttachments 2. setFileAttachments

Answer 33

Both are options to add an attachment to emails generated by Apex code.

Question 34

True/False: VisualForce email templates can be used for mass email.

Answer 34

False.

Question 35

True/False: Salesforce.com can track the status of emails in HTML format, including when it wass sent, first opened and last opened.

Answer 35

True | Note, called Tracking HTML Email

Question 36

What does the following line do: | Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage();

Answer 36

Instantiates an email object for sending a single email message.

Question 37

What does the following line do: | Messaging.MassEmailMessage mail = new Messaging.MassEmailMessage();

Answer 37

Instantiates an email object for sending a mass email message.

Question 38

What are the parameters in the following method to send an email: Messaging.sendEmail( 1 - new messaging.Email[] {mail} , 2 -opt_allOrNone);

Answer 38

1. Either Messaging.SingleEmailMessage or Messaging.MassEmailMessage. 2. Specifies whether the operation allows partial success - if false and a record fails, the remainder of the DML operation can still succeed. Note, is optional, default is true.

Question 39

True/False: Emails are not sent until the Apex transaction is completed.

Answer 39

True

Question 40

True/False: Emails are always sent with the email of the current user as sent by.

Answer 40

False. 1. The users email address can be overwritten using the method: setSenderDisplayName(''); 2. The users email address can be hidden using the method: setUseSignature(false);

Question 41

Dynamic Apex enables developers to create more flexible application by providing them with the ability to do two things, which?

Answer 41

1. Access sObject and field describe information. | 2. Write dynamic SOQL or SOSL queries.

Question 42

True/False: sObjects describe information provides information about individual records of an object.

Answer 42

False. | It provides information about objects in an organization, not individual records.

Question 43

True/False: The limits methods return the specific limit for the context in which they are being executed.

Answer 43

True.

Question 44

There are two versions of Limit methods, describe them.

Answer 44

1. One to return the amount of the resource that has been used in the currec context. 2. One to return the total amount of the resource that is available for that context.

Question 45

True/False: In the following code the string MsgTxt is not written to the debug log. System.LoggingLevel level = LogginLevel.ERROR System.debug(logginlevel.INFO, 'MsgTxt');

Answer 45

True. Since the logging level is set to Error, only debug calls with the logginglevel ERROR is shown. However if the logging level was higher, I.E. FINER all debug calls lower than FINER would show in the logs.

Question 46

True/False: During deployment to production, Salesforce enforces the following rules. 1. 75% of Apex statements must be executed by tests. 2. Every Apex trigger must be have some test coverage, even though every line of every trigger does not have to be executed by a test. 3. Every Apex test must execute without throwing any uncaught exceptions or exceeding governors.

Answer 46

1. True 2. True 3. True

Question 47

True/False: Cascading delete operations do not cause triggers to execute - records that did not initiate a delete do not cause triggers to execute.

Answer 47

True.

Question 48

True/False: All fields can be updated by Triggers

Answer 48

False. | createdDate, lastUpdated, Id - some Fields on standard objects.

Question 49

The Trigger Context Variables Old and OldMap can only be used in Insert and Update Triggers.

Answer 49

False. | Update and Delete Triggers.

Question 50

What does theTrigger Context Variable Size contain?

Answer 50

The total number of records in a trigger invocation, both old and new.

Question 51

What does theTrigger Context Variable isExecuting return?

Answer 51

Returns true if the current context for the Apex code is a trigger, not a Visualforce page, a Web service, or an executeanonymous() API call

Question 52

True/False: To Avoid deadlocks first lock parents records, then children.

Answer 52

True.

Question 53

True/False: To Avoid deadlocks lock sObject records in order of ID when multiple records of the same type are being edited.

Answer 53

True.