Mphasis Module Lead Interview Questions, Process, and Tips

Round duration - 60 minutes
Round difficulty - Medium

Technical interview round that lasted for about 60 minutes. Questions based on Java and Java Design patterns were asked.

Q1. How can you create a Singleton class in Java?
Ans. 
A Singleton class in Java ensures that only one instance of the class is created and provides a global point of access to it.
• Use a private static instance variable to hold the single instance of the class.

• Make the constructor private to prevent instantiation from outside the class.

• Provide a public static method to access the single instance, creating it if necessary.
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Q2. When can a Factory Pattern be used?
Ans. 
Factory Pattern can be used to create objects without exposing the instantiation logic to the client.
• Used when a class can't anticipate the class of objects it must create

• Helps in creating objects without specifying the exact class of object that will be created

• Encapsulates object creation logic in a separate class

• Promotes loose coupling between classes
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Q3. What is the difference between static and dynamic binding in object-oriented programming?
Ans. 
Static binding is resolved at compile time, while dynamic binding is resolved at runtime.
• Static binding is also known as early binding, while dynamic binding is known as late binding.

• Static binding is achieved using method overloading, while dynamic binding is achieved using method overriding.

• Example of static binding: function overloading in C++.

• Example of dynamic binding: method overriding in Java.
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Q4. What is the difference between an abstract class and an interface in Java?
Ans. 
Abstract class can have both abstract and non-abstract methods, while interface can only have abstract methods.
• Abstract class can have constructors, member variables, and methods with implementation.

• Interface can only have abstract methods and constants.

• A class can implement multiple interfaces but can only extend one abstract class.

• Example: Abstract class - Animal with abstract method 'eat', Interface - Flyable with m
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Round duration - 45 minutes
Round difficulty - Medium

Technical interview round that lasted for about 45 minutes. Questions based on SQL, DBMS and Entity Framework were asked.

Q1. What do you mean by an SQL injection attack?
Ans. 
SQL injection is a type of cyber attack where malicious SQL code is inserted into input fields to manipulate a database.
• SQL injection is a common web application security vulnerability.

• Attackers can inject malicious SQL code into input fields to access or manipulate database data.

• This can lead to unauthorized access, data leakage, data manipulation, and even complete database compromise.

• Example: Entering ' OR '1'='1' i
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Q2. What is a weak entity set?
Ans. 
A weak entity set is an entity set that does not have sufficient attributes to form a primary key on its own.
• Weak entity sets depend on another entity set (strong entity set) to form a primary key.

• They have a partial key which is a set of attributes that can uniquely identify entities within the weak entity set.

• Examples include 'Order Item' which depends on 'Order' entity set to uniquely identify each item.

• Another exam...read more
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Q3. What is the SQL query to fetch the first 5 characters of a string?
Ans. 
The SQL query to fetch the first 5 characters of a string is achieved using the SUBSTRING function.
• Use the SUBSTRING function in SQL to extract the first 5 characters of a string.

• The syntax is: SELECT SUBSTRING(column_name, 1, 5) FROM table_name;

• For example, SELECT SUBSTRING('Hello World', 1, 5) will return 'Hello'.
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Q4. What is the difference between clustered and non-clustered indexes in a database management system?
Ans. 
Clustered indexes physically order the data in the table, while non-clustered indexes do not.
• Clustered indexes determine the physical order of data in the table, while non-clustered indexes do not.

• Clustered indexes are faster for retrieval of data, as they eliminate the need for sorting, while non-clustered indexes require an additional lookup step.

• Tables can have only one clustered index, but multiple non-clustered in...read more
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Round duration - 40 minutes
Round difficulty - Easy

Technical interview round that lasted for about 45 minutes. Questions based on React js and Web APIs were asked.

Q1. What are synthetic events in React?
Ans. 
Synthetic events in React are cross-browser wrappers around the browser's native events.
• Synthetic events are created by React to normalize browser events and ensure consistent behavior across different browsers.

• They are instances of SyntheticEvent, which is a cross-browser wrapper around the browser's native event.

• Synthetic events have the same interface as native events but are implemented independently to work consis...read more
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Q2. Can you explain the lifecycle methods of React components?
Ans. 
React component lifecycle methods control the behavior of components during creation, updating, and destruction.
• Mounting: constructor, render, componentDidMount

• Updating: render, componentDidUpdate

• Unmounting: componentWillUnmount
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Q3. What are the main return types supported in Web API?
Ans. 
Main return types in Web API include HttpResponseMessage, IHttpActionResult, and void.
• HttpResponseMessage: Represents an HTTP response message.

• IHttpActionResult: Represents an HTTP response that can be returned from a controller action.

• void: Indicates that the action does not return a value.
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Q4. What is the difference between REST API and RESTful API?
Ans. 
REST API is an architectural style, while RESTful API is an API that follows the principles of REST.
• REST API is an architectural style that defines a set of constraints for creating web services.

• RESTful API is an API that follows the principles of REST, such as using HTTP methods and URIs to perform actions.

• REST API focuses on system design, while RESTful API focuses on the implementation of the API.

• An example of a RES...read more
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Round duration - 30 minutes
Round difficulty - Easy

Typical HR round where behavioral questions were asked.

Q1. Why do you want to join Mphasis?
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Q1. Basic Java questions from core java
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Q2. Questions from spring boot
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Q3. Questions from microservices
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Q4. Question on java8 like writing code to remove duplicates from arraylist
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Dsa, spring boot REST