\n<\/p>\n
1. What is Apex?<\/strong> <\/p>\n Apex is a programming language developed by Salesforce for writing custom code on the Salesforce platform.<\/p>\n 2. Different types of collections in Apex?<\/strong> <\/p>\n Apex supports three types of collections: Lists, Sets, and Maps.<\/p>\n 3. Tell me the difference between a List and a Set in Apex?<\/strong> <\/p>\n A List is an ordered collection that can contain duplicate values, while a Set is an unordered collection that does not allow duplicate values.<\/p>\n 4. What is a trigger in Apex?<\/strong> <\/p>\n A trigger is an Apex script that runs before or after specific data manipulation language (DML) events, like insert, update, delete, etc.<\/p>\n 5. Why we are using the \u201cwith sharing\u201d keyword in Apex class definition?<\/strong> <\/p>\n The \u201cwith sharing\u201d keyword enforces the sharing rules that apply to the current user.<\/p>\n 6. What is a governor limit in Apex?<\/strong> <\/p>\n Governor limits are runtime limits enforced by Salesforce to ensure the efficient and secure execution of Apex code.<\/p>\n 7. Name a few types of governor limits in Salesforce.<\/strong> <\/p>\n Some types of governor limits include limits on queries, DML operations, CPU usage, heap size, and callouts.<\/p>\n 8. How can you handle exceptions in Apex?<\/strong> <\/p>\n You can handle exceptions in Apex using try-catch blocks. Exceptions can be caught using catch blocks and appropriate error-handling logic can be applied.<\/p>\n 9. What is the difference between a Trigger and a Process Builder in Salesforce?<\/strong> <\/p>\n A trigger is an Apex script that runs on DML events, while Process Builder is a point-and-click automation tool to define processes without writing code.<\/p>\n 10. How do you prevent hitting governor limits in your code?<\/strong> <\/p>\n You can prevent hitting governor limits by optimizing your code, using bulk processing, and adhering to best practices. Governor limit monitoring is essential during development.<\/p>\n 11. What is the @AuraEnabled annotation used for?<\/strong> <\/p>\n The @AuraEnabled annotation exposes Apex methods to be called from Lightning Components.<\/p>\n 12. How can you make a class or method globally accessible in Apex?<\/strong> <\/p>\n You can use the \u201cglobal\u201d access modifier to make classes or methods accessible outside of your application or namespace.<\/p>\n 13. Explain the difference between a Trigger.old and Trigger.new in a trigger context.<\/strong> <\/p>\n Trigger.old represents the old version of records before they are updated, while Trigger.new represents the new version of records after they are updated.<\/p>\n 14. What is the purpose of using the \u201cTest\u201d class in Apex?<\/strong> <\/p>\n The \u201cTest\u201d class is used for writing test methods to ensure that your Apex code works as expected.<\/p>\n 15. How do you perform a callout to an external service in Apex?<\/strong> <\/p>\n You can perform callouts using the HTTP classes in Apex, such as Http and HttpRequest.<\/p>\n 16. What is a Batch Apex class?<\/strong> <\/p>\n Batch Apex allows you to process large amounts of data in smaller chunks to avoid governor limit issues.<\/p>\n 17. How can you implement a singleton pattern in Apex?<\/strong> <\/p>\n You can implement a singleton pattern by using a private constructor and a static instance variable in the class.<\/p>\n 18. Explain the difference between a before trigger and an after trigger.<\/strong> <\/p>\n A before trigger fires before the data is saved to the database, while an after trigger fires after the data has been saved.<\/p>\n 19. What is the purpose of using the \u201cDatabase\u201d class in Apex?<\/strong> <\/p>\n The \u201cDatabase\u201d class provides methods to perform DML operations, such as insert, update, delete, and upsert.<\/p>\n 20. How can you schedule an Apex class to run at a specific time?<\/strong> <\/p>\n You can use the Salesforce scheduler to execute an Apex class at a specified time using the \u201cScheduler\u201d class.<\/p>\n 21. What is a future method in Apex?<\/strong> <\/p>\n A future method is used to perform asynchronous processing and is annotated with the \u201c@future\u201d keyword.<\/p>\n 22. How can you prevent recursive triggers in Apex?<\/strong> <\/p>\n You can use a static variable or a static set to track whether the trigger has already run to prevent recursion.<\/p>\n 23. What is the purpose of the \u201cLimits\u201d class in Apex?<\/strong> <\/p>\n The \u201cLimits\u201d class provides methods to retrieve information about the current Apex execution context\u2019s governor limits.<\/p>\n 24. What is the difference between a PageReference and a PageReference object in Apex?<\/strong> <\/p>\n A PageReference is used to navigate to a Visualforce page, while a PageReference object is used to manipulate URLs in Apex.<\/p>\n 25. How can you debug Apex code in Salesforce?<\/strong> <\/p>\n You can use System.debug() statements to log debug information to the debug logs. Additionally, you can use the Developer Console or set up Debug Logs in Setup.<\/p>\n<\/p><\/div>\n