38 Advanced Salesforce Apex Interview Questions And Answers For Experienced 2019 from Codingcompiler. Test your Salesforce Apex knowledge by answering these tricky interview questions on Apex. Let’s start learning Salesforce Apex interview questions and prepare for Salesforce interviews. All the best for your future and happy learning.
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Visualforce Interview Questions And Answers 2018. Here Coding compiler presenting a list of 45 Visualforce Interview Questions. We hope that these Salesforce Visualforce interview questions will help you to crack your nex Visualforce job interview. All the best for your future and happy learning.
Question # 1. What is Visualforce?
Answer # Visualforce is tag based markup language to develop customized user interface in salesforce.
Question # 2. What is visualforce controller in salesforce? What are they?
Answer # Visualforce controller is a set of instructions that specify what happens, when user interacts with components on visualforce pages, such buttons & links.
There are three types of controllers. They are.
Standard Controller, Custom controller & Controller extensions.
Question # 3. What is Standard Controller?
Answer # Standard controller provides the salesforce in built functionality to interact with visualforce pages. You can use the standard actions like Save, Edit, Cancel & delete by using standard controllers.
Syntax : <apex:page standardController=”Account”>
Question # 4. What is Standard List Controller?
Answer # Standard List Controller allows to display list of records in visualvalfoce page. Standard list controller provides additional pagination actions (First, Lat, Next & Previous) compared to standard controller.
Syntax: <apex:page standardController=”Account” recordSetVar=”accounts”>
defining this controller is similar to standard controller. But need to add one more attribute recordSetVar
Question # 5. What is Custom Controller?
Answer # Custom controller is an apex class that implements customized logic to visualfore pages.
We can override or create new functionality by using custom controllers.
Syntax: <apex:page controller=”Account” >
Question # 6. Can we use standardController & controller attributes at a time?
Answer # No, We cannot reference both attributes at a time.
See below syntax to under stand
<apex:page standardController=”ControllerName” extensions=”Class1, Class2,..”> Correct
<apex:page Controller=”MYControllerName” extensions=”Class1, Class2,..”> Correct syntax
<apex:page standardController=”MYControllerName” Controller=”MyController”> Wrong
Visualforce Interview Questions And Answers
Question # 7. What are the tasks of standard controller?
Answer # Standard controllers provides ability to access and interact with structured business data contained in records displays in the proper user interface.
Standard controller tasks: controlling data, controlling actions and controlling navigation.
8. How can you create visualforce page in salesforce?
We can create visualforce pages in two ways.
1. From the setup menu go to Setup-> develop -> Build->Pages-> click on new button to create a page & enter name & code for visualforce page.
2. From the vsualforce editor. Enter /apex/pagename at the url & create new page in visualforce editor.
Question # 9. What is <apex:page> tag in visualforce markup?
Answer # This tag represents a single visualforce page. Every page must start & end with this tag.
<apex:page>
<!– Body of the page –>
</apex:page>
Visualforce Interview Questions And Answers
Question # 10. How can we enable visualforce editor?
Answer # We need to check the “development mode” check box at user level to enable visualforce editor.
To enable this, go to user details page check the development mode check box.
Question # 11. What are expressions used in pages to bind in controllers?
Answer # Using methods we can bind.
Getter:Will return value from controller to vf page
Setter:Will pass value from vf page to controller
Action:Will redirect to another page.
Visualforce Interview Questions And Answers
Question # 12. What is the purpose of controllers?
Answer # Controllers provide the data and actions that are available to a Visualforce page.
Question # 13. Which objects have associated standard controllers?
Answer # All standard and custom objects that can be accessed via the API have associated controllers
Question # 14. What is included with each standard controller?
Answer # Data: the fields for the associated object record that are API accessible, including the related records (5 up/1 down). Actions: save, delete, view, edit, cancel.
Visualforce Interview Questions And Answers
Question # 15. When do you need to go beyond a standard controller and code custom Apex?
Answer # If you need data beyond the limits of what is available in the standard controller or actions that go beyond the provided standard actions.
Question # 16. Compare and contrast custom controllers and controller extensions. How are they the same? How are they different?
Answer # Both allow for custom code to be used, allowing for custom data sets and custom actions. Extensions leverage the existing data and actions within a standard or custom controller.
Custom controllers must contain all data and actions that need to be executed by the page. Extensions that extend standard controller allow for the pages which use those extensions to be used in custom buttons, standard button overrides, and over declarative features.
Visualforce Interview Questions And Answers
Question # 17. What identifies a controller as being an extension?
Answer # The controller must declare a constructor which takes another controller explicitly. For example: public myControllerExtension(ApexPages.StandardController stdController) {this.acct = (Account)stdController.getRecord(); }
Question # 18. Why are properties helpful in controllers?
Answer # Properties can automatically create standard getters and setters while still allowing for their customizations. They save you from both writing the tedious code and reading the clutter when reviewing code.
Question # 19. In what order do methods fire within a controller?
Answer # The only rule is that setters fire before action methods. Aside from that, there is no guaranteed order.
Visualforce Interview Questions And Answers
Question # 20. What are some Apex classes that are commonly used within controllers?
Answer # StandardController, SelectOption, PageReference, Message, etc.
Question # 21. How are wizard controllers different from other controllers?
Answer # The two main issues is that they must handle multiple pages and they must maintain the state across those pages.
Question # 22. What are the effects of using the transient key word?
Answer # The transient key word prevents the data from being saved into the view state. This should be used for very temporary variables.
Question # 23. When is a component controller required for custom components?
Answer # A component controller is required when business logic is required to decide how to render the component.
Visualforce Interview Questions And Answers
Question # 24. What kind of content can be included in a Visualforce page?
Answer # Any content that can be rendered in a browser (HTML, JavaScript, etc.).
Question # 25. What do {!expressions} refer to when used in Visualforce components?
Answer # Expressions refer to either data or actions that are made available to the page from the controller
Question # 26. What are the ways that Visualpages can be incorporated into the rest of your user interface?
Answer # Basically, via links, buttons, tabs, and inline frames.
Question # 27. Is it always necessary to know Apex to create Visualforce pages? When does it become necessary?
Answer # No, it is not always necessary. You can use standard controllers and VF component tags to accomplish quite a bit. Apex becomes necessary when you need either a custom set of data or custom actions to be available from the page.
Visualforce Interview Questions And Answers
Question # 28. What are attributes? What is the syntax for including them?
Answer # Attributes are modifiers to the main tag that belong after the tag name in the start tag. The syntax is attributeName=“attributeValue”
Question # 29. What are three types of bindings used in Visualforce? What does each refer to?
Answer # Data bindings refer to the data set in the controller.
Action bindings refer to action methods in the controller.
Component bindings refer to other Visualforce components
Visualforce Interview Questions And Answers
Question # 30. What is the main difference between using dataTable vs. pageBlockTable tags?
Answer # PageBlock: For default salesforce standard format.
dataTable:To design customformats
Question # 31. Which tag is used with both radio buttons and picklists to create the selectable values?
Answer # <Apex:selectoption> tag
Question # 32. How many controllers can a page have? Where is the controller for a page assigned?
Answer # One main controller (of course, it could have extensions or custom components could have controllers, etc.). The controller is assigned in the <apex:page> tag.
Visualforce Interview Questions And Answers
Question # 33. There are a series of layout components that all help recreate the traditional Salesforce page layout style very easily. What name do they share?
Answer # pageBlock.
Question # 34. Which tags should be used to automatically bring in the Salesforce label and default widget for a field?
Answer # pageblock
Question # 35. What are static resources?
Answer # Static resources are a new type of storage in Salesforce specifically designed for use in Visualforce pages. They are ways to store images, flash files, stylesheets, and other web resources on the Salesforce servers that can be cached for better page performance.
Visualforce Interview Questions And Answers
Question # 36. What are some examples of JavaScript Events?
Answer # Onmouseover, onclieck etc.
Question # 37. What is AJAX typically used for in Visualforce
Answer # AJAX is primarily used for partial page updates in Visualforce. In s-controls, the AJAX toolkit was the soap (XML over HTTP) client that gave you access to the force.com Web Services API.
Question # 38. What is the purpose of <script> tags?
Answer # Script tags allow you to create JavaScript (or other types) functions that can be used within your pages
Question # 39. What are the different AJAX action tags? What does each do?
Answer #
actionStatus: used to display start and stop statuses of AJAX requests.
actionSupport: used to call a second component when an event happens to the first component.
actionPoller: similar to actionSupport, but the event is based on a timer instead of a user action.
actionFunction: provides support for invoking a controller action from JavaScript code using an AJAX request by defining a new JavaScript function.
actionRegion: used to demarcate which parts of the page the server should reprocess.
Visualforce Interview Questions And Answers
Question # 40. How can you create partial page refreshes?
Answer # Basically, you need to define the section of the page that is going to refresh (typically with a panel of sorts), and then define the event that will cause the refresh. The method changes depending on if the area being refreshed is the same as the one handling the event. It also depends on if you are just processing something on the server, or if you need the UI to change.
Question # 41. Which tag is used with both radio buttons and picklists to create the selectable values?
Answer # <apex:selectOption>
Question # 42. What is the purpose of creating attributes on components?
Answer # By allowing the component to take parameters via an attribute, you can make the component more flexible and reusable
Question # 43.What are the Global Key words?
Answer # We have global keywords like component,User,url,current page etc., to access various values from components on page, from user object or from url or from current page fields. To access value from each source, we have different global keywords. One such keyword is explained in above question(!$component)
Various global keywords are:
i. URL
ii. USER
iii. PROFILE
iv. Resource
v. Component
vi. Current page
vii. Page reference etc.
Visualforce Interview Questions And Answers
Question # 44.How can you access visualforce components values into a JavaScript?
Answer # Using Component global variable, we can access visualforce components in javascript. Let us suppose, we want to use id of an apex field with id=”afield”.
So, we can use the {!$Component.afield} syntax to use properties of the field in javascript.
Let us suppose, we want to store the field’s value in java script, then we can use like below:
<script>
Var a =’ document.getElementById(‘{!$component.afield}’).value’;
</script>
Question # 45.What are the Gov Limits in Salesforce.com?
Answer # Because Apex runs in a multitenant environment, the Apex runtime engine strictly enforces a number of limits to ensure that runaway scripts do not monopolize shared resources.
These limits, or governors, track and enforce the statistics outlined in the following table. If a script ever exceeds a limit, the associated governor issues a runtime exception that cannot be handled.
Sources: Salesforce Tutorial | Salesforce Blogspot
Salesforce Developer Interview Questions And Answers For Experienced 2018. Here in this blog post Coding compiler presenting a list of 54 Salesforce interview questions for developers. We hope that these Salesforce technical questions will help you to know what kind of questions will be asked during Salesforce interview. Let’s read Salesforce scenario based interview questions to crack your next Salesforce job interview. All the best and happy learning.
Question # 1. What is App in Salesforce?
Answer # An app is a group of tabs that work as a unit to provide functionality. Users can switch between apps using the Force.com app drop-down menu at the top-right corner of every page.
You can customize existing apps to match the way you work or build new apps by grouping standard and custom tabs.
Navigation to create an app in Salesforce: Setup ->Build ->Create->App-> Click on new and create your application according to your requirements.
Question # 2. What is the object in Salesforce?
Answer # Custom objects are database tables that allow you to store data specific to your organization in salesforce.com. You can use custom objects to extend salesforce.com functionality or to build new application functionality.
Once you have created a custom object, you can create a custom tab, custom related lists, reports, and dashboards for users to interact with the custom object data. You can also access custom object data through the Force.com API.
Navigation to create the object in sales force: Setup->Build->Create->Object-> Click on the new object and create object according to your requirement.
Question # 3. How many relationships included in SFDC & What are they?
Answer # We are having four types of relationships, they are
Lookup Relationship
Master-Detail Relationship
Many To Many
Hierarchy Relationship
Question # 4. What is a “Lookup Relationship”?
Answer # This type of relationship links two objects together,
Up to 25 allowed for object
Salesforce Interview Questions and Answers
Question # 5. What is “Master-Detail Relationship”?
Answer # Master Detail relationship is the Parent child relationship. In which Master represents Parent and detail represents Child. If Parent is deleted then Child also gets deleted. Rollup summary fields can only be created on Master records which will calculate the SUM, AVG, MIN of the Child records.
Up to 2 allowed to object.
Question # 6. How can I create Many – to – Many relationships?
Answer # Lookup and Master detail relationships are one to many relationships. We can create many – to – Many relationship by using junction object. Junction object is a custom object with two master detail relationships.
Question # 7. A custom object contains some records, now my requirement is to create the field in this object with the master-detail relationship. Can we create master-detail relationship in this case?
Answer # No, directly we cannot create master details relationship if custom object contains existing records.
Following are the steps to create to create master-detail relationship when records are available in custom object.
First create field with lookup relationship.
And then associate look field with parent record for every record.
Next change the data type of the field from look up to Master detail.
Question # 8. List examples of custom field types?
A) Text, Pick list, Pick list (multi select), Date, Email, Date/Time, Date, Currency, Checkbox, Number, Percent, Phone, URL, Text Area, Geolocation, lookup relationship, master detail relationship etc…..
Question # 9. What is TAB in Salesforce?
Answer # Tab is a user interface component to user creates to display custom object data.
There are three type of tabs.
Question # 10. Can a user create insert their own custom logo, while creating their own custom applications?
Answer # Yes user can upload their custom logo in documents and then they choose that logo for organization.
Salesforce Interview Questions and Answers
Question # 11. List things that can be customized on page layouts?
Answer # We can customize different things on page layout like, Fields, Buttons, Custom Links and Related Lists. We can also create sections.
Question # 12. What is a “Self Relationship”?
Answer # Self Relationship is a lookup relationship to the same object. Suppose let’s take an object “Merchandise”. Here we can create relationship in between the Account to Account (same object) object. That is called “Self Relationship”.
Question # 13. What are the main things need to consider in the “Master-Detail Relationship”?
Answer # Record level access is determined by the parent, Mandatory on child for reference of parent, cascade delete (if you delete the parent, it can cascade delete the child).
Question # 14. What is the difference between trigger and workflow?
Answer # Workflow – Workflow is automated process that fired an action based on Evaluation criteria and rule criteria.
We can access a workflow across the object.
We cannot perform DML operation on workflow
We cannot query from database
Trigger – Trigger is a piece of code that executes before or after a record is inserted or updated.
We can access the trigger across the object and related to that objects
We can use 20 DML operations in one trigger.
We can use 20 SOQL’s from data base in one trigger.
Question # 15. What is Wrapper class?
Answer # A Wrapper class is a class whose instances are collection of other objects.
It is used to display different objects on a Visual Force page in same table.
Question # 16. What is Difference between SOQL and SOSL?
Answer # SOQL(Salesforce Object Query Language)
Using SOQL we can Search only on one object at a time.
We can query on all fields of any datatype
We can use SOQL in Triggers and classes.
We can perform DML operation on query results.
SOSL(Salesforce object Search Language)
Using SOSL we can search on many objects at a time.
We can query only on fields whose data type is text,phone and Email.
We can use in calsses but not in Triggers.
We cannot perform DML operation on search result
Question # 17. What is difference insert() and database .insert() ?
Answer # Using insert method we can insert the records but if any error occurs in any record system will throw an error insertion fail and none of the records are inserted.
If we want to execute partially success of bulk insert operation we will use database .insert.
Question # 18. What are Static Resources?
Answer # Using Static Resources we can upload images, zip files, jar files, java script and CSS files that can be referred in a visual force page.
The maximum size of Static Resources for an organization is 250mB.
Salesforce Interview Questions and Answers
Question # 19. How to call javascript using Static Resource in Visual Force page?
Answer # Add java script file in Static Resource setup -> develop -> Static Resources -> click on ‘New’ -> Name: filename and add file from local desktop and save.
We can use that file as follows in Visual Force page
<apex: includescript values=” {! $Resource.fileName}”/>
Question # 20. What is sharing rule?
Answer # If we want to give the access to other users we use sharing rules.
Question # 21. How many ways we can share a record?
Answer # Role Hierarchy:
If we add a user to a role, the user is above in the role hierarchy will have read access.
Setup -> manage users -> roles -> setup roles -> click on ‘add role’ -> provide name and save.
OWD: Defines the base line setting for the organization.
Defines the level of access to the user can see the other user’s record
OWD can be Private, Public Read Only, Public Read and Write.
Setup -> Security Controls -> sharing settings -> Click on ‘Edit’
Manual Sharing: Manual Sharing is sharing a single record to single user or group of users.
We can see this button detail page of the record and this is visible only when OWD setting is private.
Criteria Based Sharing rules: If we want to share records based on condition like share records to group of users
Whose criteria are country is India.
Setup -> security controls -> sharing settings -> select the object and provide name and
Conditions and save
Apex sharing:
Share object is available for every object(For Account object share object is AccountShare ). If we want to share the records using apex we have to create a record to the share object.
Salesforce Interview Questions and Answers
Question # 22. What are the actions in workflow?
Answer #
1. Email Alert
2. Task
3. Field Update
4. Outbound Message
Question # 23. How many ways we can made field is required?
Answer #
1. While creation of field
2. Validation rules
3. Page Layout level
Question # 24. What is difference between Role and Profile?
Answer #
Role is Record level access and it is not mandatory for all users.
Profile is object level and field level access and it is mandatory for all users.
Question # 25. What is the maximum size of the PDF generated on visualforce attribute renderAs?
Answer # 15MB
Question # 26. How many controllers can be used in a visual force page?
Answer # Salesforce comes under SAAS so, we can use one controller and as many extension controllers.
Salesforce Interview Questions and Answers
Question # 27. What is difference between Action support and Action function?
Answer #
Action function: Invoke the controller method from java script using AJAX and we can use action function from different places on visual force page.
Action support: Invoke the controller method using AJAX when even occurs on page like onMouseOver, onClick, ect… and we can use action support for particular single apex component.
Question # 28. How many ways we can call the Apex class?
Answer #
Question # 29. How to create Master Details relationship between existing records?
Answer # Directly we can’t create Master Detail relationship between existing records, first we have to create Lookup relationship and provide valid lookup fields and it shouldn’t null.
Salesforce Interview Questions and Answers
Question # 30. What is permission set?
Answer # Permission sets extend user’s functional access without changing user’s profile.
Ex: A user has only read access through profile on custom object, administrator want to give access Edit and create operations to him without changing the profile. Administrator creates the permission set having edit and creates operation on custom object and assign to that user.
Question # 31. What is manual sharing?
Answer # Manual sharing is to share a record to a particular user manually.
Go to detail page of record and click on manual sharing button and assign that record to other user with Read or Read/Write access.
Manual Sharing button enables only when OWD is private to that object.
Question # 32. How we can change the Grant access using role hierarchy for standard objects?
Answer # Not possible.
Salesforce Interview Questions and Answers
Question # 33. What is the use of “Transfer Record” in profile?
Answer # If user have only Read access on particular record but he wants to change the owner name of that record, then in profile level Transfer Record enables he can able to change the owner.
Question # 34. What is Field dependency?
Answer # According to the field selection on one field filter the pick list values on other field.
Question # 35. Is check box performs like controlling field?
Answer # Yes possible. Controlling field should be Check box or pick list.
Question # 36. How many field dependencies we can use in Visual Force page?
Answer # Maximum we can use 10 field dependencies in VF page.
Question # 37. What is Roll-up summary?
Answer # Roll-up displays the count of child records and calculate the sum, min and max of fields of the child records.
Salesforce Interview Questions and Answers
Question # 38. How to create Roll-up summary field on lookup relation?
Answer # Not possible. Roll-up summary is enabled for only Master –Detail relationship.
Question # 39. What are the Record Types?
Answer # Record Types are restrict the pick list values and assign to the different page layouts for different Record Types.
Question # 40. What is Audit Trail?
Answer # Audit Trail provides the information or track all the recent setup changes that an administrator done to the organization.
This can store the last 6 months data.
Salesforce Interview Questions and Answers
Question # 41. What are the Report Types?
Answer # 4 Types of report in Salesforce
Tabular Reports: We can only displays the grand total in the table form.
Summary Reports: It is a detail form of report in which the grouping done based on Columns.
Matrix Reports: It is a detail form of report in which the grouping done based on both Rows and Columns.
Joined Reports: We can join the two or more reports in the single report displayed in the form of blocks.
Question # 42. What is Dashboard?
Answer # Dashboard is a pictorial representation of report. We can add up to 20 reports in single dashboard.
Question # 43. What is the default timeout period while calling webservice from Apex.
Annswer # 10Sec
Question # 44. We have a “Time Based Workflow” and there is Action scheduled to be executed. If we Deactivate the workflow, Scheduled actions will be removed from queue or not?
Answer # Action will be performed even if we are deactivated the workflow.
Salesforce Interview Questions and Answers
Question # 45. How to delete “Time based workflow” if there is already an action scheduled?
Answer # We can’t delete the “Time based workflow” if any pending actions in the queue.
Question # 46. How to update the record using After Trigger context?
Answer # Not possible. You will get error like “Record is Read only”.
Question # 47. What is the difference between “Export” and “Export All” in Data Loader in Salesforce?
Answer # Export is export all the data from Salesforce.com excluding the recycle bin’s data.
Export All is export all the data from Salesforce including the recycle bin’s data.
Question # 48. What is the use of “ALL ROWS” in SOQL?
Answer # ALL ROWS is used for retrieving the records from recycle bin.
Ex: SELECT Id from Campaign ALL ROWS
-> “ALL ROWS” is not work in developer console.
Salesforce Interview Questions and Answers
Question # 49. What is the use of “FOR UPDATE” in SOQL?
Answer # FOR UPDATE is used to lock the records.
Ex: Campaign cam = [SELECT id FROM Campaign LIMIT 1 FOR UPDATE];
Question # 50. What is the use of “savepoint” in apex?
Answer # This is will use for to roll back the changes.
Question # 51. How to call Apex class using java script?
Answer # Check the below code.
Apex Class:
global class ClassName{
webService static String methodName(String camName) {
Campaign cam = new Campaign(name = camName);
return cam.name;
}
}
Java Script:
var Campaign = sforce.sObject(“Campaign”);
var String = sforce.apex.exceute(“ClassName”,”methodName”,{name=”ABC”});
Salesforce Interview Questions and Answers
Question # 52. How to run trigger in asynchronously?
Answer # If you use @FUTURE annotation trigger run asynchronously.
Question # 53. We are not providing some of fields in .csv file which are required in page layout level. What happens if we try to insert records into Salesforce through data loader?
Answer # All records are inserted in Salesforce successfully.
Salesforce Interview Questions and Answers
Question # 54. We are not providing some of fields in .csv file which are required in Filed level. What happens if we try to insert records into Salesforce through data loader?
Answer # Except those records remaining records will be inserted in to Salesforce. Source: Salesforce Tutorial
