Salesforce Developer Interview Questions and Answers

1. What is the Apex programming language provided Salesforce?

Salesforce Apex language is a programming language that can be used for many different things.
Environment. Apex is the first programming language that runs in the Cloud.
Apex is an object-oriented programming language that follows all the rules of object-oriented programming.
programming.

2. Features of the Salesforce Apex programming language.

Salesforce has built-in exception handling for its Data manipulation language (DML).
SOQL and SOSL are used to:
query and retrieve data.
Salesforce’s Apex has a built-in way to lock records. This keeps record updates from going wrong.
 Salesforce Apex programming language runs on multi-tenant Environment.
Metadata format is used to store Apex code.
It has the same syntax and variables as Java.
It lets you test units and run tests with code coverage.
If we want to add web and email services to your application.
It is used to handle complicated business tasks.
When you can add complex rules for application validation.
Using Salesforce Apex, you can add your own logic to things like saving a record.

3. How many ways can Apex Programming be written?

Here are some ways that Salesforce gives you to write apex code.

Navigation as usual.
Console for developers.
Use the Anonymous Window command:
Eclipse IDE.

4. How many ways can an Apex code be run?

The following formats can be used to run the Apex code.

Using Execute Anonymous Window
By using Triggers.
With the help of Visual Force Pages
When you use Batch Apex
Using Schedule Programming
When you use email services
By using API or Webservices.

5. How many types of data are there?

Datatype talks about the following things.

What kinds of information the variable can store.
How much space is needed to store the information?

Datatypes

Primitive Datatypes:
Integer, Long, string, Decimal, Double, Boolean, Date, DateTime, ID, and Blob.
Datatypes for SObjects:
Account, Contact, Lead, Opportunity, Case, Solution, Position C, Customer C, and so on.
User
Menu
Developer
Console
File
New
Apex
Class

6. What does Class mean?

A class is a physical entity or blueprint that has a group of variables, functions, procedures, and other parts.

properties, Constructors, etc.

Encapsulation is a part of OOP that can be done with classes.

Note:

The name of a class should always begin with a character.
The name of a class should be a single word.
We can’t make two classes in the application that both have the same name.
As a best practice, the first letter of a class name should be a capital letter.
Each class should be put together and saved in Force.com’s “Meta data Repository.”
platform.

7. What does it mean? We need a reference called a “Object” to be able to assign and get to the class members.

Which is a member of the class?

Note:

We can have just one object in a class or more than one.

Each thing should have its own name. (That is, we can’t give two things the same name.)

Each object stores the values for each member of the class.

Each object has its own place in memory.

8. What does Encapsulation mean?

Encapsulation is the process of putting code and data together into a single unit.It gives you security. Ex: Class

9. How does polymorphism work?

When the same job can be done in different ways, this is called polymorphism.

Polymorphism is achieved through method overloading and method overriding.

10. What is Inheritance?

Inheritance is the process by which one object takes on all of the properties and behaviors of its parent object. It

provides code reusability.

It is used to get polymorphism at runtime.

A class that is passed down from another class is called a Parent class, Base class, or Super class.

Derived class or child class is the name for a class that builds on a base class.

11. Describe Abstraction.

Abstraction is the process of hiding internal details while showing how something works.

We use an abstract class and an interface to separate things.

The Programming Elements can be hidden in different ways (Variables and Methods)

Keywords:

private
protected
public
global

12. what is this keyword?

This keyword used to stand for the instance of the class that was currently being used.

13. what does Final mean?

If you make a variable final, you can’t change its value (It will be constant). If a Class is marked as final, it can’t be inherited. Final variables can only be given a value once, either when the variable is declared or in the code that initializes it. If the implementation is perfect and doesn’t need any more changes, make that method final.

14. how does Super keyword work?

Classes that are extended from virtual or abstract classes can use the super keyword. When we use super, we can override the constructors and methods of the parent class.

The best ways to use Super keyword:

Classes that extend from virtual or abstract classes are the only ones that can use super. You can only use the keyword “override” in methods where you want to use “super.”

15. what is the keyword Virtual?

Classes that are virtual cannot be global.

16. what is the Abstract keyword in Apex?

The class is declared with the keyword “abstract” and is called a “abstract class.” If we don’t know how to implement a method right now but can do so later, we can make that method “abstract.” The “abstract” definition modifier says that this class has “abstract” methods, which are methods whose signatures are declared but whose bodies are not.

17. How do you define the term “With Sharing”?

If you define a class as shared, the current user’s sharing rules will be applied, and he or she will be able to access and modify objects and fields according to those rules.

18. definition of the term “Without Sharing”

Apex code may access all objects and fields regardless of the current user sharing rules, field level security, and Object permissions if the class is declared as without sharing and runs in system mode.

19. How do you define the Interface keyword?

The method signatures are included in an interface, but the implementation of any given method is left up to the caller.
A class must implement an interface in order to make use of it by supplying implementations for all of the interface’s functions.

20. what is Extends keyword?

Specifies a class that may be used to extend another.

21. What does the term “Implements” mean?

A class that prevents another class from functioning properly is declared using this keyword.

22. Please explain the return keyword.

This keyword triggers a method’s return value.

23. What is Exceptional Handling – Try, Catch, Finally, Throw?

Something goes wrong when running the software. The feces problem must be solved algorithmically.
The try keyword denotes a possible exception handling region of code.
Two such keywords are “catch” and “finally,” both of which are used to specify blocks of code that are guaranteed to run in the event of certain types of exceptions.
The throw keyword indicates an error has occurred and should be handled by throwing an exception.

24. Tell me about the Synchronous keyword.

You may think of Synchronous in the most basic sense as Sequential. The thread in a synchronous process waits for the task to finish before proceeding to the next job in the sequence. Everything gets done on a single thread.
Trigger is a frequent Synchronous apex example 25. What does the term “asynchronous” mean?
The thread in Asynchronous apex advances to the next job without waiting for the previous one to finish. All of the tasks are executed concurrently, but in separate “threads.” These processes operate autonomously in bursts of system availability.
The Future annotation is the most typical instance of this type.

26. When comparing static and non-static, what are the key differences?

All the variables and the procedures are non-static by design.
All non-static variables and methods are local to the same object.
By utilizing the “static” keyword, we may make some variables and methods permanent.
Static variables and methods have transaction-wide applicability.
The class name is all that’s needed to access static variables and methods; we can’t directly access them.
methods whose names are objects).
To access a property shared by several objects and not specific to any one, use a static variable.
object)
Examples include: o the names of companies, workers, students, etc.
Memory is allocated for the static variable just once, when the class is loaded.
Only the static method is allowed to utilize the static variable.
It improves the memory efficiency of your software.

27. The Setter Method: How Does It Work?

The name of the Apex variable will be updated with the value from the corresponding visual force page.

28. The Getter Method: How Does It Work?

When a page using the name variable is called, this method will return that value.

29. In Apex, what is the function of a Constructor?

Apex programming classes often have a particular function called the constructor that is called whenever a new object of that class is created. The following are characteristics of the constructor.
This Class’s methods will all have the same name.
A public access specifier is planned.
This method is called just once, upon object creation, and it’s used to initialize the class’s data members.

30. What are the various Collections in Apex?

List (sorted, with duplicates allowed)
Set (unsorted, no duplicates allowed) Map (key, value pairs)

31. In other words, what exactly is List collection?

The List Is Now in Order
Allowing duplicates on a list.
Using index, we can go to the items in the list.
List components may be sorted using the sort method (ascending by default).
List does not support the Contains function.
With DML commands (insert, update, remove, and select), we can manipulate list data.
restore)
List Methods:
1)add (Element Name>): To add an item to the collection, use add (Element Name>).
2)AddAll (From List>) : you may use AddAll (From List>) to include every item in the given set.
3)Add (Integer IndexPositin, elementName>), inserts the given element at the given index.
given index value inside the set.
4) The Integer Size() method produces an integer that represents the total number of items in the collection.
5) Boolean isEmpty(): This function checks whether the collection is empty and returns TRUE if it is.
when there is no more data to gather. Otherwise, it gives back the false value.
6) Get(IndexPosition>), retrieves the specified item from the collection at the specified index.
key placement.
7) Equals(ListCollection>), which is used to determine whether two collections are equivalent. With a result of TRUE,
when the two collections are same. If they are not, False is returned.
8) Discard (IndexNumber): This function is used to eliminate the item from the collection.
correspond to the given index point.
9) Clear (), and it is used to clear the whole collection.
10)Set (indexposition, NewValue>): This function allows us to replace the current value of an element’s name with a new one.
replacement for the current value at the given index.
SObjectType() is the eleventh function and it returns the collection’s Datatype.

32. What does “Set collection” mean?

The set is not sorted.
Set prohibits duplications.
You can’t use an index to get to the items of a set.
There is no sorting functionality for Set.
Set’s Contains method lets you locate a value inside the collection, however DML operations can’t be used on set records.
Set Methods:
1) Add(ElementName>), is used to add an item to the collection.
2) AddAll(CollectionName>): This function adds every item from the given collection to the target collection.
Class of Set Collections.
3) Integer Size (), returns an integer indicating the size of the collection in terms of the number of items it contains.
4) isEmpty(), returns a boolean value of TRUE if the collection is empty. Otherwise, it gives back the false value.
5) Contains(elementName>), returns TRUE if and only if the collection in question includes the specified element.
according to the given name.
6)Equals(SetCollectionName>) you may compare two objects in the Set collection using the Equals(SetCollectionName>) function. Also, this will
return TRUE if the two collections are identical. Otherwise, it gives back the false value.