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Apex Interview Questions and Answers
This page contains a carefully selected collection of Apex Interview Questions and Answers designed for students, Salesforce beginners, software developers, and experienced professionals preparing for Salesforce developer interviews. The questions cover both theoretical concepts and practical programming examples commonly asked during technical interviews.
Apex is Salesforce's strongly typed, object-oriented programming language used to build business logic on the Salesforce Platform. It enables developers to create triggers, classes, asynchronous jobs, REST services, integrations, and custom automation while working securely with Salesforce data.
This interview guide covers beginner, intermediate, advanced, and scenario-based Apex interview questions including Apex syntax, triggers, SOQL, SOSL, governor limits, collections, asynchronous Apex, exception handling, testing, batch processing, integrations, and best practices followed by Salesforce developers.
Why Learn Apex?
Apex is one of the most important technologies for Salesforce developers. Organizations around the world use Salesforce to manage customer relationships, automate business processes, and build cloud applications. Strong Apex knowledge is essential for creating custom business logic and enterprise-level Salesforce solutions.
Interviewers frequently evaluate a candidate's understanding of Apex programming, triggers, SOQL, governor limits, asynchronous processing, integrations, and testing. Practicing these interview questions helps improve both conceptual understanding and coding confidence.
Topics Covered
- Apex Language Basics
- Classes and Objects
- Triggers
- SOQL & SOSL
- Collections
- Governor Limits
- Exception Handling
- Batch Apex
- Queueable & Future Methods
- REST & SOAP Integrations
- Unit Testing
- Performance Optimization
Apex is object-oriented, strongly typed, multitenant aware, integrated directly with the database, and provides built-in support for transactional triggers as well as complex asynchronous processing loops.
Account acc = new Account(Name = 'Acme Corp');
insert acc;
Governor limits are runtime limits enforced by the Salesforce multitenant engine to prevent shared execution threads from monopolizing system resources.
// Bulkified query and list insert
List<Contact> contactsToInsert = new List<Contact>();
for (Account acc : [SELECT Id FROM Account LIMIT 100]) {
contactsToInsert.add(
new Contact(
LastName = 'Doe',
AccountId = acc.Id
)
);
}
insert contactsToInsert;
SOQL (Salesforce Object Query Language) is used to read data structures and records from individual object structures.
List<Opportunity> opps = [
SELECT Id, Name, Amount, StageName
FROM Opportunity
WHERE CloseDate = TODAY
];
SOSL (Salesforce Object Search Language) is used to scan text patterns across multiple index tables at once.
List<List<SObject>> searchList = [
FIND 'Acme*'
IN ALL FIELDS
RETURNING
Account(Name),
Contact(FirstName, LastName)
];
SOQL retrieves exact records from a single object index, whereas SOSL performs multi-object keyword searches efficiently across text columns.
// SOQL (Exact retrieval)
Account acc = [
SELECT Id
FROM Account
WHERE Name = 'Acme'
LIMIT 1
];
// SOSL (Fuzzy search)
List<List<SObject>> results = [
FIND 'Acme'
IN NAME FIELDS
RETURNING Account(Id, Name)
];
A trigger is Apex code that runs dynamically before or after specific DML operations, such as record insertions, edits, or removals.
trigger AccountTrigger on Account (before insert, before update) {
for (Account acc : Trigger.new) {
if (acc.Industry == null) {
acc.Industry.addError('Industry is required.');
}
}
}
Data Manipulation Language statements modify records in the Salesforce database (e.g., insert, update, delete, undelete, upsert).
List<Account> newAccs = new List<Account>{
new Account(Name = 'Tech Corp'),
new Account(Name = 'Media Group')
};
insert newAccs;
A class is a structural template or object-oriented blueprint containing processing methods and properties.
public class Vehicle {
private String model;
public Vehicle(String modelName) {
this.model = modelName;
}
}
Apex provides four levels of visibility control: public, private, protected, and global.
global class GlobalService {
public static void performTask() {
// Shared across namespaces and API integrations
}
}
A static variable is scoped to the class itself rather than individual instances, and persists across execution contexts.
public class Counter {
public static Integer staticCount = 0; // Class-level shared state
public Integer instanceCount = 0; // Object-level individual state
}
A constructor is a special class method called automatically during object instantiation to initialize state.
public class Employee {
public String name;
public Employee(String empName) {
this.name = empName;
}
}
Batch Apex processes massive datasets asynchronously by splitting operations into smaller, manageable transaction blocks called chunks.
public class AccountUpdateBatch implements Database.Batchable<SObject> {
public Database.QueryLocator start(Database.BatchableContext bc) {
return Database.getQueryLocator(
'SELECT Id FROM Account'
);
}
public void execute(
Database.BatchableContext bc,
List<Account> scope
) {
// Process each chunk safely
}
public void finish(Database.BatchableContext bc) {
// Post-processing logic
}
}
A future method (annotated with @future) executes asynchronously in its own thread block when resources become available.
public class AsyncHelper {
@future
public static void callExternalWebService(String payload) {
// Async processing
}
}
A test class contains verification logic to test Apex code functionality, and is required to hit a minimum 75% code coverage threshold for production deployments.
@isTest
private class AccountServiceTest {
@isTest
static void testAccountCreation() {
Account acc = new Account(Name = 'Test Acc');
insert acc;
System.assertNotEquals(
null,
acc.Id,
'Account ID should be generated'
);
}
}
Bulkification is the practice of designing code to handle sets of records efficiently in a single operation, rather than processing individual records one-by-one inside loop blocks.
// BAD (Trigger with nested query)
// for (Account a : Trigger.new) {
// List<Contact> c = [
// SELECT Id
// FROM Contact
// WHERE AccountId = :a.Id
// ];
// }
// GOOD (Bulkified query mapping)
Set<Id> accIds = new Set<Id>();
for (Account a : Trigger.new) {
accIds.add(a.Id);
}
List<Contact> contacts = [
SELECT Id, LastName
FROM Contact
WHERE AccountId IN :accIds
];
A wrapper class is a custom container object used to bind multiple distinct data types or sObjects together into a single logical structure.
public class TableWrapper {
public Account accRecord { get; set; }
public Boolean isSelected { get; set; }
public TableWrapper(Account a) {
this.accRecord = a;
this.isSelected = false;
}
}
A map is an un-ordered collection that stores data in key-value pairs, where each key uniquely maps to a single corresponding value.
Map<Id, Account> accountMap =
new Map<Id, Account>([
SELECT Id, Name
FROM Account
LIMIT 10
]);
Account target =
accountMap.get('0018000000GvNX0AAN');
A set is an unordered collection of elements that enforces uniqueness, preventing duplicate entries from being added to the collection.
Set<String> uniqueCodes =
new Set<String>{
'US',
'UK',
'CA',
'US'
};
System.debug(uniqueCodes.size()); // Outputs 3
A list is an ordered collection of elements indexed by position. It can contain duplicate values and functions like a standard dynamic array.
List<String> names = new List<String>();
names.add('Akash');
names.add('Rahul');
String first = names.get(0);
Queueable Apex is an asynchronous design pattern that builds upon future methods, allowing you to monitor job status and chain sequential asynchronous execution flows.
public class AsyncProcessor implements Queueable {
public void execute(QueueableContext context) {
// Chainable async operation
System.enqueueJob(new SecondaryProcessor());
}
}
An sObject is a generic data type that can represent any standard or custom Salesforce object record in memory.
sObject genericRecord =
new Account(Name = 'Generic Corp');
String objName =
genericRecord
.getSObjectType()
.getDescribe()
.getName();
Schema Builder is a visual design utility inside Salesforce used to manage data models, define objects, and establish relationship connections. At the code level, you describe these schemas programmatically.
Map<String, Schema.SObjectType> gd =
Schema.getGlobalDescribe();
Schema.DescribeSObjectResult descResult =
gd.get('Account').getDescribe();
The with sharing keyword enforces the organization-wide defaults and sharing rules of the running user for all database queries and transactions in that class.
public with sharing class SecureRecordController {
// Respects sharing rules
// of current logged-in user
}
The without sharing keyword executes class logic in system mode, ignoring the current user's sharing rules and record permissions.
public without sharing class AdminDataOverrider {
// Skips sharing rules
// and operates with system-level access
}
The upsert command checks if a record exists based on an ID or unique external ID field; it updates the record if found, or inserts a new record if it is not.
Account acc = new Account(
Name = 'Upsert Corp',
External_ID__c = 'EXT-101'
);
upsert acc External_ID__c;
The Database class provides system methods for database manipulation, supporting partial successes via the allOrNone parameter option.
Database.SaveResult[] srList =
Database.insert(accountList, false);
// false allows partial success
Trigger context variables (e.g., Trigger.new, Trigger.oldMap, Trigger.isInsert) provide operational state and data from the triggering transaction.
trigger ContactTrigger on Contact (before update) {
for (Contact newCon : Trigger.new) {
Contact oldCon =
Trigger.oldMap.get(newCon.Id);
if (newCon.Email != oldCon.Email) {
System.debug(
'Email changed from '
+ oldCon.Email
);
}
}
}
A callout executes HTTP requests from Apex to integrate and exchange payload data with external web services.
Http http = new Http();
HttpRequest request = new HttpRequest();
request.setEndpoint(
'https://api.example.com/data'
);
request.setMethod('GET');
HttpResponse response =
http.send(request);
Exception handling uses try-catch-finally blocks to intercept runtime errors, handle failures gracefully, and execute mandatory cleanup actions.
try {
insert new Lead(LastName = 'Smith');
}
catch (DmlException e) {
System.debug(
'DML failed: ' + e.getMessage()
);
}
finally {
System.debug(
'Transaction finished processing.'
);
}
Apex methods annotated with @AuraEnabled allow client-side Lightning Web Components (LWC) to call server-side actions, retrieve database records, or trigger business logic.
public class ContactController {
@AuraEnabled(cacheable=true)
public static List<Contact> getContactList() {
return [
SELECT Id, FirstName, LastName
FROM Contact
LIMIT 10
];
}
}
Platform Events support an event-driven architecture, enabling applications to run independently by publishing and subscribing to real-time notification streams.
Order_Event__e eventObj =
new Order_Event__e(
Order_Id__c = 'ORD-009',
Status__c = 'Shipped'
);
Database.SaveResult sr =
EventBus.publish(eventObj);
A Mixed DML error occurs when you try to modify a setup object (like User) and a non-setup object (like Account) in the same transaction context.
User u = [
SELECT Id
FROM User
WHERE Alias = 'admin'
];
System.runAs(u) {
// Update User (Setup Object)
}
// Update Account (Non-Setup Object)
// outside block
The Apex Scheduler executes specific classes at scheduled intervals by implementing the Schedulable interface.
public class CleanupScheduler
implements Schedulable {
public void execute(SchedulableContext sc) {
// Delete orphaned logs dynamically
}
}
Custom Metadata Types are application configurations that can be packaged and deployed between environments. They are read from cache without consuming SOQL query limits.
App_Setting__mdt setting =
App_Setting__mdt.getInstance(
'Global_Config'
);
Boolean featureEnabled =
setting.Is_Active__c;
Field-Level Security (FLS) manages user access to specific fields on objects. It should be validated dynamically in Apex before querying or mutating field data.
if (
Schema.sObjectType.Contact
.fields.Email.isAccessible()
) {
// Query/Read field safely
}
Dynamic SOQL allows you to construct and execute SOQL query strings at runtime using the Database.query() method.
String dynamicField = 'Phone, Email';
String queryStr =
'SELECT Id, '
+ dynamicField
+ ' FROM Lead LIMIT 5';
List<Lead> leads =
Database.query(queryStr);
A Savepoint defines a specific state in a transaction that you can roll back to in case of errors, without reverting the entire transaction.
Savepoint sp =
Database.setSavepoint();
try {
insert new Account(
Name = 'Success'
);
insert new Contact();
// Fails due to missing LastName
}
catch (Exception e) {
Database.rollback(sp);
// Reverts transaction
}
Custom Settings are application configurations cached in memory. They provide fast read access without using SOQL query limits.
Discount_Setting__c discount =
Discount_Setting__c.getInstance();
Decimal rate =
discount.Global_Rate__c;
CRUD permissions control user access to entire objects, while FLS permissions control user access to specific fields on those objects.
if (
Schema.sObjectType.Account.isCreateable()
&&
Schema.sObjectType.Account
.fields.Rating.isCreateable()
) {
insert new Account(
Name = 'Protected Inc',
Rating = 'Hot'
);
}
List<Account> accs = [
SELECT Id, Name
FROM Account
];
Account acc =
new Account(Name='Test');
insert acc;
acc.Name = 'Updated';
update acc;
delete acc;
@future
public static void asyncMethod() {
// Long running asynchronous process
}
global class MyBatch
implements Database.Batchable<SObject> {
global Database.QueryLocator start(
Database.BatchableContext BC
) {
return Database.getQueryLocator(
'SELECT Id FROM Account'
);
}
global void execute(
Database.BatchableContext BC,
List<Account> scope
) {
// Batch chunks executed here
}
global void finish(
Database.BatchableContext BC
) {
// Cleanup actions
}
}
trigger AccountTrigger on Account (
before insert
) {
for (Account acc : Trigger.new) {
// Before insert logic
}
}
public class MyQueue
implements Queueable {
public void execute(
QueueableContext context
) {
// Async processing
}
}
String q =
'SELECT Id FROM Account';
List<Account> accs =
Database.query(q);
try {
// Execution with risk
}
catch (DmlException e) {
System.debug(
'Exception: ' + e.getMessage()
);
}
Apex is object-oriented, strongly typed, multitenant aware, integrated directly with the database, and provides built-in support for transactional triggers as well as complex asynchronous processing loops.
Account acc = new Account(Name = 'Acme Corp');
insert acc;
Governor limits are runtime limits enforced by the Salesforce multitenant engine to prevent shared execution threads from monopolizing system resources.
// Bulkified query and list insert
List<Contact> contactsToInsert = new List<Contact>();
for (Account acc : [SELECT Id FROM Account LIMIT 100]) {
contactsToInsert.add(
new Contact(
LastName = 'Doe',
AccountId = acc.Id
)
);
}
insert contactsToInsert;
SOQL (Salesforce Object Query Language) is used to read data structures and records from individual object structures.
List<Opportunity> opps = [
SELECT Id, Name, Amount, StageName
FROM Opportunity
WHERE CloseDate = TODAY
];
SOSL (Salesforce Object Search Language) is used to scan text patterns across multiple index tables at once.
List<List<SObject>> searchList = [
FIND 'Acme*'
IN ALL FIELDS
RETURNING
Account(Name),
Contact(FirstName, LastName)
];
SOQL retrieves exact records from a single object index, whereas SOSL performs multi-object keyword searches efficiently across text columns.
// SOQL (Exact retrieval)
Account acc = [
SELECT Id
FROM Account
WHERE Name = 'Acme'
LIMIT 1
];
// SOSL (Fuzzy search)
List<List<SObject>> results = [
FIND 'Acme'
IN NAME FIELDS
RETURNING Account(Id, Name)
];
A trigger is Apex code that runs dynamically before or after specific DML operations, such as record insertions, edits, or removals.
trigger AccountTrigger on Account (before insert, before update) {
for (Account acc : Trigger.new) {
if (acc.Industry == null) {
acc.Industry.addError('Industry is required.');
}
}
}
Data Manipulation Language statements modify records in the Salesforce database (e.g., insert, update, delete, undelete, upsert).
List<Account> newAccs = new List<Account>{
new Account(Name = 'Tech Corp'),
new Account(Name = 'Media Group')
};
insert newAccs;
A class is a structural template or object-oriented blueprint containing processing methods and properties.
public class Vehicle {
private String model;
public Vehicle(String modelName) {
this.model = modelName;
}
}
Apex provides four levels of visibility control: public, private, protected, and global.
global class GlobalService {
public static void performTask() {
// Shared across namespaces and API integrations
}
}
A static variable is scoped to the class itself rather than individual instances, and persists across execution contexts.
public class Counter {
public static Integer staticCount = 0; // Class-level shared state
public Integer instanceCount = 0; // Object-level individual state
}
A constructor is a special class method called automatically during object instantiation to initialize state.
public class Employee {
public String name;
public Employee(String empName) {
this.name = empName;
}
}
Batch Apex processes massive datasets asynchronously by splitting operations into smaller, manageable transaction blocks called chunks.
public class AccountUpdateBatch implements Database.Batchable<SObject> {
public Database.QueryLocator start(Database.BatchableContext bc) {
return Database.getQueryLocator(
'SELECT Id FROM Account'
);
}
public void execute(
Database.BatchableContext bc,
List<Account> scope
) {
// Process each chunk safely
}
public void finish(Database.BatchableContext bc) {
// Post-processing logic
}
}
A future method (annotated with @future) executes asynchronously in its own thread block when resources become available.
public class AsyncHelper {
@future
public static void callExternalWebService(String payload) {
// Async processing
}
}
A test class contains verification logic to test Apex code functionality, and is required to hit a minimum 75% code coverage threshold for production deployments.
@isTest
private class AccountServiceTest {
@isTest
static void testAccountCreation() {
Account acc = new Account(Name = 'Test Acc');
insert acc;
System.assertNotEquals(
null,
acc.Id,
'Account ID should be generated'
);
}
}
Bulkification is the practice of designing code to handle sets of records efficiently in a single operation, rather than processing individual records one-by-one inside loop blocks.
// BAD (Trigger with nested query)
// for (Account a : Trigger.new) {
// List<Contact> c = [
// SELECT Id
// FROM Contact
// WHERE AccountId = :a.Id
// ];
// }
// GOOD (Bulkified query mapping)
Set<Id> accIds = new Set<Id>();
for (Account a : Trigger.new) {
accIds.add(a.Id);
}
List<Contact> contacts = [
SELECT Id, LastName
FROM Contact
WHERE AccountId IN :accIds
];
A wrapper class is a custom container object used to bind multiple distinct data types or sObjects together into a single logical structure.
public class TableWrapper {
public Account accRecord { get; set; }
public Boolean isSelected { get; set; }
public TableWrapper(Account a) {
this.accRecord = a;
this.isSelected = false;
}
}
A map is an un-ordered collection that stores data in key-value pairs, where each key uniquely maps to a single corresponding value.
Map<Id, Account> accountMap =
new Map<Id, Account>([
SELECT Id, Name
FROM Account
LIMIT 10
]);
Account target =
accountMap.get('0018000000GvNX0AAN');
A set is an unordered collection of elements that enforces uniqueness, preventing duplicate entries from being added to the collection.
Set<String> uniqueCodes =
new Set<String>{
'US',
'UK',
'CA',
'US'
};
System.debug(uniqueCodes.size()); // Outputs 3
A list is an ordered collection of elements indexed by position. It can contain duplicate values and functions like a standard dynamic array.
List<String> names = new List<String>();
names.add('Akash');
names.add('Rahul');
String first = names.get(0);
Queueable Apex is an asynchronous design pattern that builds upon future methods, allowing you to monitor job status and chain sequential asynchronous execution flows.
public class AsyncProcessor implements Queueable {
public void execute(QueueableContext context) {
// Chainable async operation
System.enqueueJob(new SecondaryProcessor());
}
}
An sObject is a generic data type that can represent any standard or custom Salesforce object record in memory.
sObject genericRecord =
new Account(Name = 'Generic Corp');
String objName =
genericRecord
.getSObjectType()
.getDescribe()
.getName();
Schema Builder is a visual design utility inside Salesforce used to manage data models, define objects, and establish relationship connections. At the code level, you describe these schemas programmatically.
Map<String, Schema.SObjectType> gd =
Schema.getGlobalDescribe();
Schema.DescribeSObjectResult descResult =
gd.get('Account').getDescribe();
The with sharing keyword enforces the organization-wide defaults and sharing rules of the running user for all database queries and transactions in that class.
public with sharing class SecureRecordController {
// Respects sharing rules
// of current logged-in user
}
The without sharing keyword executes class logic in system mode, ignoring the current user's sharing rules and record permissions.
public without sharing class AdminDataOverrider {
// Skips sharing rules
// and operates with system-level access
}
The upsert command checks if a record exists based on an ID or unique external ID field; it updates the record if found, or inserts a new record if it is not.
Account acc = new Account(
Name = 'Upsert Corp',
External_ID__c = 'EXT-101'
);
upsert acc External_ID__c;
The Database class provides system methods for database manipulation, supporting partial successes via the allOrNone parameter option.
Database.SaveResult[] srList =
Database.insert(accountList, false);
// false allows partial success
Trigger context variables (e.g., Trigger.new, Trigger.oldMap, Trigger.isInsert) provide operational state and data from the triggering transaction.
trigger ContactTrigger on Contact (before update) {
for (Contact newCon : Trigger.new) {
Contact oldCon =
Trigger.oldMap.get(newCon.Id);
if (newCon.Email != oldCon.Email) {
System.debug(
'Email changed from '
+ oldCon.Email
);
}
}
}
A callout executes HTTP requests from Apex to integrate and exchange payload data with external web services.
Http http = new Http();
HttpRequest request = new HttpRequest();
request.setEndpoint(
'https://api.example.com/data'
);
request.setMethod('GET');
HttpResponse response =
http.send(request);
Exception handling uses try-catch-finally blocks to intercept runtime errors, handle failures gracefully, and execute mandatory cleanup actions.
try {
insert new Lead(LastName = 'Smith');
}
catch (DmlException e) {
System.debug(
'DML failed: ' + e.getMessage()
);
}
finally {
System.debug(
'Transaction finished processing.'
);
}
Apex methods annotated with @AuraEnabled allow client-side Lightning Web Components (LWC) to call server-side actions, retrieve database records, or trigger business logic.
public class ContactController {
@AuraEnabled(cacheable=true)
public static List<Contact> getContactList() {
return [
SELECT Id, FirstName, LastName
FROM Contact
LIMIT 10
];
}
}
Platform Events support an event-driven architecture, enabling applications to run independently by publishing and subscribing to real-time notification streams.
Order_Event__e eventObj =
new Order_Event__e(
Order_Id__c = 'ORD-009',
Status__c = 'Shipped'
);
Database.SaveResult sr =
EventBus.publish(eventObj);
A Mixed DML error occurs when you try to modify a setup object (like User) and a non-setup object (like Account) in the same transaction context.
User u = [
SELECT Id
FROM User
WHERE Alias = 'admin'
];
System.runAs(u) {
// Update User (Setup Object)
}
// Update Account (Non-Setup Object)
// outside block
The Apex Scheduler executes specific classes at scheduled intervals by implementing the Schedulable interface.
public class CleanupScheduler
implements Schedulable {
public void execute(SchedulableContext sc) {
// Delete orphaned logs dynamically
}
}
Custom Metadata Types are application configurations that can be packaged and deployed between environments. They are read from cache without consuming SOQL query limits.
App_Setting__mdt setting =
App_Setting__mdt.getInstance(
'Global_Config'
);
Boolean featureEnabled =
setting.Is_Active__c;
Field-Level Security (FLS) manages user access to specific fields on objects. It should be validated dynamically in Apex before querying or mutating field data.
if (
Schema.sObjectType.Contact
.fields.Email.isAccessible()
) {
// Query/Read field safely
}
Dynamic SOQL allows you to construct and execute SOQL query strings at runtime using the Database.query() method.
String dynamicField = 'Phone, Email';
String queryStr =
'SELECT Id, '
+ dynamicField
+ ' FROM Lead LIMIT 5';
List<Lead> leads =
Database.query(queryStr);
A Savepoint defines a specific state in a transaction that you can roll back to in case of errors, without reverting the entire transaction.
Savepoint sp =
Database.setSavepoint();
try {
insert new Account(
Name = 'Success'
);
insert new Contact();
// Fails due to missing LastName
}
catch (Exception e) {
Database.rollback(sp);
// Reverts transaction
}
Custom Settings are application configurations cached in memory. They provide fast read access without using SOQL query limits.
Discount_Setting__c discount =
Discount_Setting__c.getInstance();
Decimal rate =
discount.Global_Rate__c;
CRUD permissions control user access to entire objects, while FLS permissions control user access to specific fields on those objects.
if (
Schema.sObjectType.Account.isCreateable()
&&
Schema.sObjectType.Account
.fields.Rating.isCreateable()
) {
insert new Account(
Name = 'Protected Inc',
Rating = 'Hot'
);
}
List<Account> accs = [
SELECT Id, Name
FROM Account
];
Account acc =
new Account(Name='Test');
insert acc;
acc.Name = 'Updated';
update acc;
delete acc;
@future
public static void asyncMethod() {
// Long running asynchronous process
}
global class MyBatch
implements Database.Batchable<SObject> {
global Database.QueryLocator start(
Database.BatchableContext BC
) {
return Database.getQueryLocator(
'SELECT Id FROM Account'
);
}
global void execute(
Database.BatchableContext BC,
List<Account> scope
) {
// Batch chunks executed here
}
global void finish(
Database.BatchableContext BC
) {
// Cleanup actions
}
}
trigger AccountTrigger on Account (
before insert
) {
for (Account acc : Trigger.new) {
// Before insert logic
}
}
public class MyQueue
implements Queueable {
public void execute(
QueueableContext context
) {
// Async processing
}
}
String q =
'SELECT Id FROM Account';
List<Account> accs =
Database.query(q);
try {
// Execution with risk
}
catch (DmlException e) {
System.debug(
'Exception: ' + e.getMessage()
);
}
Continue Your Salesforce Interview Preparation
Salesforce professionals are often expected to have knowledge beyond Apex programming. Interviewers may also ask questions about Salesforce administration, Lightning components, SOQL, Visualforce, integrations, Java fundamentals, SQL, and general programming concepts. Practicing related technologies will improve your confidence and increase your chances of clearing technical interviews.
Tips to Crack an Apex Developer Interview
Employers hiring Salesforce developers usually look for candidates who understand both Apex programming and the Salesforce platform. Along with theoretical knowledge, you should be able to explain governor limits, write optimized SOQL queries, use bulk processing, handle triggers correctly, and build scalable applications using Apex best practices.
Practice writing Apex classes, triggers, test classes, batch jobs, scheduled jobs, asynchronous Apex, REST integrations, and Lightning controllers. Hands-on experience with real Salesforce projects can significantly improve your interview performance.
Recommended Apex Learning Path
- Salesforce Platform Fundamentals
- Objects and Relationships
- SOQL & SOSL Queries
- Apex Classes
- Apex Triggers
- Collections
- Governor Limits
- Exception Handling
- Batch Apex
- Future Methods & Queueables
- REST & SOAP Integrations
- Test Classes & Code Coverage
About This Apex Interview Guide
This Apex Interview Questions and Answers guide has been created to help beginners, Salesforce administrators, developers, and experienced professionals prepare for technical interviews. The questions cover both theoretical concepts and practical programming topics that are frequently asked by companies hiring Salesforce developers.
The content is updated regularly according to current Salesforce releases and interview trends. Continue practicing real coding exercises, Trailhead modules, and Salesforce development projects to strengthen your understanding and perform confidently during technical interviews.