Mercedes-Benz Research and Development India Java Developer Interview Questions and Answers

Q1. Use of functional interface
Ans. 
Functional interfaces in Java are interfaces with only one abstract method, used for lambda expressions and method references.
• Functional interfaces can be used with lambda expressions and method references to provide implementation for the single abstract method.

• Examples of functional interfaces in Java include Runnable, Callable, and Comparator.

• Functional interfaces can also have default and static methods in addition
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Q2. Can you use same static method in two different interface
Ans. 
No, static methods cannot be overridden in interfaces.
• Static methods in interfaces are implicitly public and abstract, so they cannot be overridden.

• If two interfaces have the same static method signature, it will not cause any conflict.

• Implementing classes will have to provide their own implementation of the static method.
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Q1. I have added the questions below
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Q2. I have added thebelow
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Q1. Based on the resume
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Q1. Scenario based questions
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Q1. Package discussion
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Good coding questions related array and string

Q1. What is Custom exception?
Ans. 
Custom exception is a user-defined exception that extends the functionality of the built-in exceptions in Java.
• Custom exceptions are created by extending the Exception class or one of its subclasses.

• They allow developers to define their own exception types for specific scenarios.

• Custom exceptions can include additional methods and fields to provide more information about the exception.

• Example: public class CustomExcept...read more
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Q2. What is roles and responsibilities in your project?
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Q3. Find out duplicate element in array?
Ans. 
Use a HashSet to find duplicate elements in an array of strings.
• Create a HashSet to store unique elements.

• Iterate through the array and check if the element is already in the HashSet.

• If it is, then it is a duplicate element.

• Example: String[] array = {"apple", "banana", "apple", "orange"};
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Q1. Mostly questions were on core java and multitasking Difference between wait() and sleep()
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Q2. Synchronization, implementation of HashMap
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Q3. Array questions
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Theory plus coding questions

Q1. Core Java , spring boot questions, project
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Q2. Project challenges how resolved
Ans. 
Resolved project challenges through effective problem-solving techniques.
• Identified the root cause of the challenges

• Collaborated with team members to brainstorm solutions

• Implemented appropriate strategies to overcome obstacles

• Tested and validated the implemented solutions

• Documented the resolution process for future reference
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Q3. Difficult situation in project while working with team how resolved
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Q4. Core string concept in depth
Ans. 
Core string concepts include immutability, string manipulation, and string comparison.
• Strings in Java are immutable, meaning they cannot be changed once created.

• String manipulation can be done using various methods like concatenation, substring, and replace.

• String comparison can be done using equals() method for content comparison and == operator for reference comparison.
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Q5. Soft skills questions
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Aptitude, Reasoning and verbal.

OOPS based two simple coding question.

Q1. 1.Question related my college life.
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Q2. 2. What Difficulty I faced in my life and how I overcome it.
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