Introduction to APEX Interview Questions and Answers
APEX is a proprietary programming language and is an object-oriented and strongly typed programming language. It was developed by Salesforce Inc., which is a Software Development Company and an American Cloud Computing company where its headquarters is based in San Francisco, California, USA. It was a publicly listed company in the USA and also listed under NYSE (New York Stock Exchange). APEX will allow the developers to execute the flow and the transaction control statements in the Salesforce platform server. All the Salesforce programmers are recommended to have knowledge of APEX. The Salesforce platform knowledge is needed for the development in the case of APEX programming.
APEX has a syntax that is similar to Java and works like stored procedures in a database. APEX is available with different kinds of editions of the Salesforce platform.
So if you have finally found your dream job in APEX but are wondering how to crack the APEX Interview and what could be the probable 2021 APEX Interview Questions, every interview is different, and the scope of a job is different too. Keeping this in mind, we have designed the most common APEX Interview Questions and answers to help you get success in your interview.
Below are the 10 important 2021 APEX Interview Questions and Answers that are frequently asked in an interview. These questions are divided into parts are as follows:
Part 1 – APEX Interview Questions (Basic)
This first part covers basic Interview Questions and Answers.
1. What is APEX, and what is it used for?
Answer:
APEX is an object-oriented programming language and is a proprietary language that is strongly typed and was developed by Salesforce. It will be used to develop the products in Salesforce to perform transaction control statements and flow execution operations. The APEX’s syntax is similar to Java and can be used in web service requests.
2. What are the features of APEX?
Answer:
The different features of APEX are strong and strict data integration to perform the execution of multiple queries and statements concurrently, strongly typed, which directly refers to the object schema to provide the value, easy to use syntax which was derived from the java kind of programming language, easy testing which will provide easier execution and test suite creation.
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Let us move to the next APEX Interview Questions.
3. What are the applications of APEX?
Answer:
The different types of applications of APEX are to create different types of services such as email, schedules, triggering etc., creating different web services with integration of multiple systems and different services, performing validations on multiple schema objects and customized validation rules, creating customized business processes for the unavailable features.
4. What is the architecture of APEX?
Answer:
These are the common APEX Interview Questions asked in an interview. The APEX architecture will involve an application server, data storage where the network will be connected to the internet, and the end-users and developer users will be involved in the different web server requests and compilation errors and validations. The platform application server compiles the source code into a sequence of instructions and will be interpreted by an Apex interpreter. The end-users will do the execution of the triggers. There will be no delay in the web service request to the application server platform.
5. What is APEX syntax?
Answer:
APEX syntax has different features, such as a variable declaration to store the memory’s different values. The queries will be like SOQL, which will be used to execute the queries, loop statements to perform the iterations in performing the operations, flow control statements can be used to control the flow execution whether to start or stop the execution process, DML statements can be used to manipulate the data by executing the queries.
Part 2 –APEX Interview Questions (Advanced)
Let us now have a look at the advanced Interview Questions.
6. What does the APEX development environment contain?
Answer:
The Salesforce APEX development environment has different features and processes to be followed to develop an application and set up successfully and edition as per the entity’s requirement. The code can be developed either in a local developer edition or a sandbox of Salesforce. As per the standards, the code will usually be developed in Sandbox and will be deployed into production. The different operations that will be performed during the development of the code are developing the code and its compilation process, debugging the code, testing the code and application, performing the SOQL query execution and its efficiency, colour coding, auto-alignment and auto-completion of the build process. The main step of executing the code in Salesforce will include the login action into Salesforce sandbox or console before performing these operations.
7. What are the different data types in APEX?
Answer:
The different types of data types available in the APEX language are Primitive Data Type (Integer, Long, Double, Date, DateTime, ID, or Boolean and String), Collections (Lists, Maps, and Sets) and Enum Classes, Interfaces and Objects. The Primitive data type Integer can be any value of a 32-bit number and will have some range similar to that of the Java programming language. A Boolean data type will have a true and false value. The Date data type can only store the date value but not the time. The Primitive data type Long can be any value of a 64-bit number and will have some range similar to that of the Java programming language. The String data type is a set of characters that will be initialized within single quotes. The data type Blob also exists, which stores a binary set of data. Enum is an abstract kind of data type.
8. What are the different Collections in APEX?
Answer:
The different collection data structures in APEX are Lists, Maps, and Sets. A-List can have any type of data stored in it, such as primitives, collections, different types of complex objects or schema objects. There will be different types of methods available in the lists to perform different operations, such as retrieving the size of the list, clearing the contents, getting the details of the list, and updating, delete, and adding the records or values into it. The same functionalities do also exist for Set and Maps but with different functionalities.
9. What is SOQL in APEX?
Answer:
These are the advanced APEX Interview Questions asked in an interview. SOQL is often called Salesforce Object Query Language, designed and developed to work with Salesforce Database.
10. What are the Security features in APEX?
Answer:
APEX’s different security rules are enforced while sharing the data or while running the code to protect the application features and code. There are different sharing security features also to be enforced, and different levels of security.
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