Mphasis Java Developer Interview Questions and Answers for Experienced

All question related to core java

Q1. In how many ways can create an object
Ans. 
An object can be created in Java using new keyword, clone method, newInstance method, and deserialization.
• Using new keyword: ClassName obj = new ClassName();

• Using clone method: ClassName obj2 = (ClassName) obj1.clone();

• Using newInstance method: ClassName obj3 = (ClassName) Class.forName("ClassName").newInstance();

• Using deserialization: ObjectInputStream in = new ObjectInputStream(new FileInputStream("file.ser")); Class
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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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Balanced Bracket problem. {}[]()

Q1. Project Experience and Most Challenging work problem you faced?
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Q1. Questions related to Spring annotations, HashMap internal working, Design Patterns
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Q1. React lifecycle, screen share coding questions
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Q1. N/A, this never happens
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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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Q1. Abstract & Interface
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Q2. ArrayList/LinkedList
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Start Pattern logic/Design Pattern