Johnson Controls Lead Engineer Interview Questions and Answers

I applied via Naukri.com and was interviewed before Jun 2023. There were 3 interview rounds.

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I applied via Approached by Company and was interviewed before Mar 2022. There were 3 interview rounds.

Round 1 - Resume Shortlist 

Pro Tip by AmbitionBox:

Keep your resume crisp and to the point. A recruiter looks at your resume for an average of 6 seconds, make sure to leave the best impression.

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I applied via Approached by Company and was interviewed in Sep 2017. There were 5 interview rounds.

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I applied via Referral and was interviewed in Mar 2023. There were 2 interview rounds.

Round 1 - Resume Shortlist 

Pro Tip by AmbitionBox:

Don’t add your photo or details such as gender, age, and address in your resume. These details do not add any value.

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Interview Preparation Tips

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I applied via Referral and was interviewed before May 2023. There was 1 interview round.

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I applied via Recruitment Consultant and was interviewed in Jul 2021. There was 1 interview round.

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I applied via Naukri.com and was interviewed in Dec 2020. There were 5 interview rounds.

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I applied via Naukri.com and was interviewed in Sep 2024. There was 1 interview round.

Round 1 - Technical 

(5 Questions)

Q1. Thread concurrency
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Q2. Sql for deleting dulicates and keeping one
Ans. 
Use SQL query with ROW_NUMBER() function to delete duplicates and keep one.
• Use ROW_NUMBER() function to assign a unique number to each row partitioned by the duplicate column(s)

• Delete rows where the row number is greater than 1
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Q3. Java stream for sorting emp object

Ans. 

Use Java Stream API to sort a list of employee objects based on a specific field.

• Use the sorted() method of Stream to sort the employee objects based on a Comparator.

• Define a Comparator based on the field you want to sort by.

• Example: List sortedList = employeeList.stream().sorted(Comparator.comparing(Employee::getSalary)).collect(Collectors.toList());

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Q4. Sql for getting the max salary

Ans. 

Use SQL query with MAX function to get the maximum salary from a table.

• Use SELECT MAX(salary) FROM employees;

• Make sure to replace 'employees' with the actual table name where salary information is stored.

• Ensure that the column name for salary is correct in the query.

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Q5. Completablefuture

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