Apex Salesforce Questions and Answers for Viva

Answer-1: Apex is a strongly typed, object-oriented programming language used for developing applications on the Salesforce platform.

Answer-2: Apex is Salesforce-specific and integrates tightly with the Salesforce database and APIs, whereas Java is a general-purpose language.

Answer-3: Governor Limits are Salesforce-imposed runtime limits to ensure efficient resource usage and multi-tenancy.

Answer-4: The two types are before triggers (execute before a record is saved) and after triggers (execute after a record is saved).

Answer-5: A class in Apex is defined using the class keyword, e.g., public class MyClass { }.

Answer-6: Trigger Context Variables provide runtime information about a trigger, such as Trigger.new or Trigger.old.

Answer-7: SOQL (Salesforce Object Query Language) is used to retrieve data from Salesforce objects.

Answer-8: SOQL retrieves data from a single object, while SOSL searches across multiple objects.

Answer-9: Apex classes are used to create custom business logic, perform database operations, and integrate with external systems.

Answer-10: The @AuraEnabled annotation exposes Apex methods to Lightning components and enables data binding.

Answer-11: @future methods are used to perform asynchronous processing in Apex, like making callouts to external systems.

Answer-12: A batch class processes large volumes of data asynchronously in smaller, manageable chunks.

Answer-13: Exception handling is implemented using try-catch blocks, e.g., try { } catch (Exception e) { }.

Answer-14: A Map is a key-value pair data structure, e.g., Map mapName = new Map();.

Answer-15: Test classes are used to write unit tests to validate Apex code functionality and maintain code coverage.

Answer-16: Database.executeBatch is used to run a batch Apex job.

Answer-17: An interface defines methods that a class must implement but provides no implementation itself.

Answer-18: Visualforce controllers handle the logic behind Visualforce pages, including custom and standard controllers.

Answer-19: A Trigger is an Apex code block that executes before or after database operations like insert, update, delete, or merge.

Answer-20: Database.insert allows partial success with allOrNone control, while insert does not.

Answer-21: A List is an ordered collection of elements of the same data type.

Answer-22: Polymorphism in Apex is supported through method overriding and dynamic method invocation.

Answer-23: A static method belongs to the class, not an instance, and can be called using the class name.

Answer-24: public allows access within the application, while global makes it accessible outside the application as well.

Answer-25: Custom exceptions are user-defined exceptions that extend the Exception class.

Answer-26: System.runAs is used to execute code in the context of a specific user for testing purposes.

Answer-27: A wrapper class is a custom data structure that wraps multiple objects or data types.

Answer-28: The @isTest annotation is used to define classes and methods for testing purposes in Apex.

Answer-29: Database.rollback undoes database changes within a transaction.

Answer-30: Callouts are made using HTTP classes like HttpRequest and HttpResponse.

Answer-31: Custom metadata types define application configuration data that can be reused and packaged.

Answer-32: The Limits class provides methods to check governor limits, e.g., Limits.getQueries().

Answer-33: upsert inserts a new record or updates an existing one based on an external ID or ID field.

Answer-34: Asynchronous Apex executes code asynchronously, such as batch jobs, future methods, and scheduled jobs.

Answer-35: Schema.sObjectType provides metadata information about sObjects.

Answer-36: Custom settings store application data accessible across the organization.

Answer-37: A set is an unordered collection of unique elements.

Answer-38: These methods create a new governor limits context for testing specific code execution.

Answer-39: A future call is an asynchronous method invocation using the @future annotation.

Answer-40: A queueable job is an asynchronous job that is queued for execution, using the Queueable interface.

Answer-41: The transient keyword prevents variable values from being serialized during view state.

Answer-42: Workflows are declarative and limited, while Apex triggers are programmatic and flexible.

Answer-43: A Debug Log captures system execution details for debugging Apex code and configurations.

Answer-44: Bulk triggers process multiple records in a single transaction to handle bulk operations.

Answer-45: Sharing rules are enforced using the with sharing or without sharing keywords.

Answer-46: JSON.deserialize converts JSON strings into Apex objects.

Answer-47: LWC is a modern UI framework for building Salesforce components using HTML and JavaScript.

Answer-48: Custom labels store text values that can be accessed in Apex, Visualforce, or LWC for localization purposes.

Answer-49: Platform events enable event-driven communication between Salesforce and external systems.

Answer-50: Database.query executes dynamic SOQL queries in Apex code.