Top 300+ Salesforce Development Interview Questions

1) OOP’S

1. What is Inheritance?
2. What is the use of virtual keyword for a class?
3. What the use is of extends keyword?
4. What is a constructor?
5. How is Constructor overloading?
6. What is the difference between static and non-static variables?
7. What are final variables?
8. What are transient variables?
9. What are final static variables?
10. What is difference between with sharing class and without sharing class?
11. What is system context and what is user context?
12. What is encapsulation?
13. How to do you restrict the access on the data in the class?
14. What is the use of override keyword?
15. What is wrapper class?
16. What is Type casting?
17. What is Type conversion?
18. How to call static methods in the Apex class?
19. In how many ways we can call Apex class?
20. What is interface?
21. What is abstract class?
22. Name some of the predefined interfaces?
23. How to make an apex class visible to user?

2) List & Set & Map

1. What is an array?
2. Elements in the array are referred using?
3. What are the drawbacks of array?
4. What is a List ?
5. What is the internal data structure?
6. Will List maintain the insertion order?
7. Are the duplicates are allowed in the list ?
8. How the elements in the list are referred ?
9. What is difference between add() and addAll() methods?
10. what is the difference between add(index,ele) and set(Index,ele)
11. How the size of a list?
12. How to sort the elements in the list in the ascending order?
13. How to sort the elements in the list in the descending order?
14. What is set?
15. What is the internal data structure?
16. Will set allow duplicates?
17. Will the set maintains insertion order?
18. How the elements in the set are referred ?
19. What is the use of contains(ele), ContainsAll(eles)
20. What is the use of retainAll(ele)
21. Can we sort the elements in the set ?
22. What is Map?
23. Can a key be duplicate?
24. Can a value be a duplicate?
25. What is keyset () in map?
26. What is values() on map?

3) SOQL & SOSL

1. What is SOQL?
2. What is the return type of SOQL?
3. What is dynamic soql?
4. PWhen do you use Database. Query()?
5. How many records can be fetched using SOQL?
6. What is LIMIT in SOQL?
7. What is OFFSET key in the SOQL?
8. What is the limit of OFFSET ?
9. What is ALL ROWS in SOQL?
10. How to fetch the records from Recycle bin using SOQL?
11. What are Parent to child SOQL query?
12. What is Child to Parent SOQL?
13. Name some date function in SOQL?
14. What are Aggregate functions?
15. What is the difference between count() and Count(fieldname) in SOQL?
16. What is Aggregate Result?
17. Where do you use AggregateResult?
18. What are the governing limits on SOQL?
19. How to reduce the no of SOQL in a transaction?
20. How to write SOQL using MAP?
21. What is the Advantage of writing SOQL using MAP?
22. What is SOSL?
23. What is the return type of SOSL?
24. How many records are fetched using SOSL?
25. Can we write Aggregate functions using SOSL?
26. How to lock the records from being edited by others using SOQL?
27. What are alias name in SOQL?
28. What is the use of Aggregate function SOQL queries in salesforce?
29. What is the use of group by clause in SOQL?
30. Can we write group by clause in SOSL?

4) DML

1. What are DML operations?
2. What are Atomic operations?
3. What are non-Atomic operations?
4. What is the difference between insert and Database.insert?
5. How to empty the recycle bin?
6. How to hard delete the data?
7. How many DML statements we can write in a single transaction?
8. How to avoid DML 151: Exception?
9. What are the best practices we should follow while writing DML?
10. What is Upsert operation?
11. What is the user external id in the Upsert operation?
12. Which fields can be external id fields?
13. How to undelete the data using DML?
14. What is merge statement in DML?
15. When we perform merge operation what will happen to the child records of the record which is deleted?

5) Future Methods

1. What are Asynchronous methods?
2. What are different types of Asynchronous methods we have in salesforce?
3. What is future method?
4. How to define future methods?
5. Which types of parameters we can pass in the future methods?
6.What is the syntax of future method ?
7. Can we pass SObjects as parameters in future methods ?
8. If you need to pass the sobject | List < Sobjects > as parameters how do you pass?
9. What are mixed DML Exception?
10. What are setup objects?
11. What are non-setup objects?
12. Can we call webservices from future methods?
13. What is the use of @future(callout=true)
14. How to track the status of the future methods that are running?
15. What is the use of AsyncApexjob object?
16. Can we call future methods from Batch Apex?
17. Can we call future methods from Triggers?
18.Can we call future methods from Schedule Apex?
19. How to call the web service callouts from Schedule Apex and Triggers?
20. Can we call asynchronous methods from Another Asynchronous method?
21. Name some methods which are not supported by future methods?
22. How many future methods we can call in a transaction?

6) Batch Apex

1. What are Governing Limits in salesforce?
2. Name some Governing limits in salesforce ?
3. How many DML statements can be written in a transaction?
4. What is the Governing limit of SOQL query?
5. On how many records we can perform DML operation in a transaction?
6. What are Asynchronous operations?
7. How to track the Asynchronous jobs in salesforce?
8. What is Batch Apex?
9. What is Database.Batchable interface?
10. What are the methods in the Database.Batchable interface?
11. What is Database. Query Locator?
12. How many records can be fetched using Database. Query Locator in start method?
13. When do you use Database. Query Locator as return type for start method?
14. What is Iterable < Sobject > interface?
15. When do you use Iterable as return type in start method?
16. How many records can be fetched using Iterable?
17. What is Iterator?
18. What is Database.BatchableContext?
19. What is the use of the Database.BatchableContext ?
20. What is the use of execute() method?
21. How many times execute() method will be called?
22. What is the scope parameter in execute() method?
23. What is the use of finish method?
24. What is the default size of the batch?
25. What is the minimum size of the batch?
26. What is the maximum size of the batch?
27. At a time how many jobs can be added to the queue?
28. What is the Flex concept in batch?
29. Can we call batch apex in another batch?
30. Is the state of the data is maintained between the batch apex execute methods?
31. What is Database.Stateful interface?
32. When do we use Database.Stateful interface?
33. If we use Database.stateful interface then state of the static variables is maintained?
34. Can we call web service callouts from the batch apex ?
35. What is the use of Database. Allow Callouts?
36. How many callouts we can call in each execute()?
37. How to call one batch apex in another batch apex?
38. Can we call future method in execute method of the batch apex?
39. Can a class have Both Database.Batchable and Schedule Apex on a same class?
40. Give some scenarios where you have batch apex and why you have used it?
41. When we have divided the job into five batches and if any one of the batch job fails what will happen to other jobs?

7) Schedule Apex

1. What is schedulable interface?
2. How many methods are there in the schedulable interface?
3. In how many ways we can schedule the apex class?
4. What is the difference between manual schedule and apex schedule?
5. What is cron Trigger?
6. How do you define cron expression?
7. Can we schedule the job for every hour?
8. Can we schedule the job for every minute?
9. How many jobs can be scheduled at a time?
10. Can we call the batch apex from the schedule apex?
11. Can we call the synchronous web service callouts from the schedule apex?
12. How to call asynchronous web service call from Schedule apex?
13. Give some scenarios where you have used schedule apex?
14. How to stop the schedule jobs using Apex?

8) Schema

1. What is schema?
2. What is sobjectType?
3. What is getSobjectType?
4. What is Schema.Describesobjectresult?
5. How to create a new Sobject Dynamically?
6. What is the use of get Global Describe();
7. How to fetch all the subjects in the salesforce ?
8. How to fetch fields from Given Sobject?
9.How to fetch picklist entries from the given picklist fields?
10. How to fetch the tabs info from Schema?
11. Where do we use the schema programming ?

9) FLOWS & PLUGINS

1. What is visual flow?
2. When do we use visual flows?
3.What are plugins ?
4. What is process.Plugin?
5. What is the use of invoke method ?
6. What is the use of describe method?
7. How to read the parameters from flow to plugin?
8. What is the use of Process.Described Result?
9. How to invoke the flows from Visualforce page?
10. How to pass the values from Visualforce page to flow /Plugin?

10) Triggers

1. What is workflow?
2. When workflow is invoked?
3. What is a Trigger?
4. What is the difference between Trigger and workflow?
5. What are Trigger events?
6. What are trigger context variables?
7. If we insert 100 records how many times the trigger is called?
8. What is Bulk Trigger?
9. What is the difference between the Trigger. New and Trigger .old in the Update triggers?
10. What is the difference between Trigger. New and Trigger.NewMap in update trigger?
11. When we perform the operation using before Trigger and after Trigger which you prefer?
12. Can we write SOQL query to fetch set the records which are in Trigger. New in before trigger?
13. Can we write DML on the List of records which are in Trigger. New in before triggers?
14. What are recursive triggers?
15. How to handle recursive Triggers?
16. How many triggers we can write on the same object with same trigger event?
17. What is order of execution of trigger?
18. Will the field update done on the workflow call the update Triggers?
19. Can we call the batch apex from the trigger?
20. Can we call the schedule apex from the trigger?
21. Can we call the future methods from the triggers?
22. Can we send an email using Trigger?
23. What are the good practices that you have to maintain while writing trigger?
24. How to disable the triggers for a particular user?
25. Are the triggers are fired while loading the data using dataloader?
26. How to run the triggers only when the data comes from external system?

11) Remote Actions

1. What is remote action?
2. How do you define the remote action methods?
3. How to invoke the remote action?

12) Custom Settings

1. How to fetch the data from sobject?
2. What is global data?
3. What is custom setting object?
4. How to fetch the data from custom setting object?
5. How many types of custom setting are there?
6. What List Custom Setting type?
7. How to fetch the data from the List Custom setting type ?
8. How to fetch the data from Hierarchy custom setting type ?
9. How do you personalize the data for a user or a organization?
10. What is the advantage of custom settings?
11. Can we write a SOQL query on the Custom Settings object?
12. Are the actions on the custom setting are counted against governing limits?
13. When we want disable all the validation rules for a specific user on the all the sobjects how can we achieve it?
14. When we want to deactivate a trigger for a specific user how to achieve it?

13) Test Classes

1. How to define test class?
2. What is @istest?
3. What is the use of @is Test(seeAllData=true)
4. How do you test Asynchronous jobs?
5. What is the use of Test.StartTest() and Test.StopTest()
6. What is Test.is Running User(userid)
7. What is minimum test coverage required to deploy the class?
8. What is the minimum test coverage required to deploy the Trigger?
9. Are the DML operations in the test classes are going to update the data in the sobject?
10. Should we write test class for Wrapper classes?
11. Should we write test classes for Visualforce pages?

14) Visualforce Basic level Questions

1. When do you use Visualforce page?
2. Which components we can use in visualforce pages ?
3. What will happen if we set the < apex: page readOnly="true" >
4. Which API version we are using in the VF page?
5. How to generate page in PDF format?
6. What is the use of renderAS attribute in < apex:page > component?
7. All the components are supported in the pdf format?
8. What all the content-types are supported in the VF page?
9. What is Standard Controller?
10. How many standard Controller we can define in the < apex:page >
11. What is controller in the VF page ?
12. When do you use controller?
13. How many controller we can define in the VF page?
14. Can a controller have constructor with parameters?
15. What are extensions in VF page?
16.When do you use extensions in VF page?
17. If we define Apex class as extensions then Apex class should have constructor with which parameter?
18. What is the difference between < apex:actionFunction >, < apex:action Support > ,RemoteAction?
19. What are basic rules that we have to check before we invoke a method from Visualforce page?
20.What is the difference between insert and Include and define ?
21. What is < apex:actionpooler? >
22.In action pooler interval is given in which format?
23.What is the difference between pageBlockTable ,dataTable, dataList, repeat ?
24. How many records we can display in the pageBlockTable?
25. If you want to display more than 1000 records using pageBlockTable how to achieve?
26. If you want to display more than 10,000 records using pageBlockTable how to implement it?
27. What is pagination?
28. In how many ways we can implement pagination?
29. What is the drawback pagination using SOQL?
30. What is the drawback of pagination using QueryMore?
31.What is advantage of pagination using StandardSetController?
32. Can we use < apex: repeat > in the JavaScript?
33. How to transfer the data from one VF page to another VF page?
34. What is PageReference?
35.What is action attribute in < apex:page >?
36.What is the execution order of VF page?
37. What is the difference between rendered, reRender, RenderAs ?
38.What is view state?
39. What is the governing limits in the view state?
40. Will the view state maintains static variables state?
41. Will the view state maintains the transient variables state?
42. How to overcome view state exception?

15) Scripting

1. When do you use scripting?
2. What all the different types of scripting supported in VF page?
3. What is ajax?
4. what is the use of connection.js?
5. How to generate session ld in javascript?
6. what is use of Sforce.connection.login?
7. How many records can be fetched using SOQL in the AJAX?
8. How to write DML using AJAX?
9. What is the difference between query and querymore?
10. What is the advantage of using AJAX?
11. Tell me one scenario where you have used AJAX and why you have used it?
12. What is reRender?

16) Jquery

1. What is jquery?
2. Did you work with any scripting framework?
3. How to use jquery in the Visualforce?
4. In how many ways we can include jquery in Visualforce page?
5. How to refer to visualforce components using jquery?
6. Name some functions in the jQuery?
7. What is auto complete functionality in jQuery?
8. What is toggle functionality?
9. Name one scenario where you have used jquery in your project?
10. Why did you prefer to use jquery than javascript in the above context ?
11. Did you create any custom components using Jquery?
12. How to use ajax with Jquery?

16) Proiect Scenario

1. Creation of Product line items page with AutoComplete with pdf generation using Ajax,Jquery,SOQL,pdf pages ?
2. Creation of reports using visualforce pages and aggregate functions in soql?
3. We have built opportunity and lead pages to meet our business requirements ?
4. Created custom buttons on the list view pages to perform mass operations?

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