Persistent Systems Interview Questions, Process, and Tips

Q1. Internal Working of HashMap
Ans. 
HashMap is a data structure that stores key-value pairs and uses hashing to quickly retrieve values based on keys.
• HashMap internally uses an array of linked lists to store key-value pairs.

• When a key-value pair is added, the key is hashed to determine the index in the array where it will be stored.

• If multiple keys hash to the same index, a linked list is used to handle collisions.

• To retrieve a value, the key is hashed a...read more
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Q2. Core Java Questions
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Q1. Resume shortlist
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Q1. Mostly Questions come from real-time scenarios only, interviewer taken 1 hour of my time for interview
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Q2. How to change create date while uploading the record through data loader?
Ans. 
You can change the create date while uploading records through Data Loader by enabling the 'Allow Insert' option.
• Enable 'Allow Insert' option in Data Loader settings

• Map the 'Created Date' field in the mapping file to the desired date/time value

• Ensure the user has the necessary permissions to change the create date
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Q3. How wire method works, while importing data want to add record inside wire method in Jsfile how?
Ans. 
Wire method in Salesforce is used to fetch data from Apex controller to Lightning Web Component. Adding records inside wire method in JS file involves using imperative Apex to create records.
• Use @wire decorator in Lightning Web Component JS file to call an Apex method

• Inside the wire method, use imperative Apex to create records by calling the createRecord method from the Lightning Data Service

• Pass the record data as pa
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Q4. Write a trigger on account if account already having 1 contact then user can't able to create another
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Q5. How security works in apex, let's say user don't have access on Phone field and SELECT id, Name, Phone from Account WITH_SECURITY_ENFORCED how this query works?
Ans. 
In Apex, security is enforced by default. If a user doesn't have access to a field, they won't be able to query it.
• In Apex, security is enforced by default, meaning that users can only access data they have permission to see.

• If a user doesn't have access to the Phone field in the Account object, they won't be able to query it even with WITH_SECURITY_ENFORCED.

• The SELECT id, Name, Phone from Account WITH_SECURITY_ENFORCE...read more
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Q1. Questions about JAVA
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Q2. Ask to write SQL queries
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Q1. Basic HR questions
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Q2. Basic HR questions like relocation
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MCQ based on logical, quantitative, qualitative and english

Two easy questions based on string manipulation

Q1. Find count of each characters in string
Ans. 
The task is to count the occurrences of each character in a given string.
• Iterate through the string and use a hashmap to store the count of each character

• Convert the string to an array of characters for easier manipulation

• Handle edge cases like empty string or null input

• Consider using built-in functions like HashMap in Java or Counter in Python
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Q2. Find Freq of words in a sentence
Ans. 
Use a hashmap to store word frequencies in a sentence.
• Split the sentence into words using a space delimiter.

• Create a hashmap to store word frequencies.

• Iterate through the words and update the frequencies in the hashmap.

• Return the hashmap with word frequencies.
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Q1. What is your qualification?
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Q2. Explain about the projects that you completed while attending the college.
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Q1. Explaining the previous roles
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Q2. Technical about job and job description
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