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Capgemini Java Developer Interview Questions and Answers
96 Interview questions
ConcurrentHashMap is a thread-safe variant of HashMap that allows concurrent access and updates without locking the entire map.
Thread Safety: ConcurrentHashMap allows multiple threads to read and write concurrently without locking the entire map, improving performance.
Segmented Locking: It divides the map into segments, allowing threads to lock only a segment when updating, which reduces contention.
Null Values: Un...
Dependency Injection is a design pattern that allows a program to achieve Inversion of Control by injecting dependencies into a class.
Promotes loose coupling between classes, making code easier to manage and test.
Facilitates easier unit testing by allowing mock dependencies to be injected.
Commonly used in frameworks like Spring, where beans are injected into classes.
Example: Instead of a class creating its own dep...
Java 8 provides streams to filter even numbers from an array and calculate their sum efficiently.
Use Streams: Java 8 introduced streams, which allow for functional-style operations on collections.
Filter Even Numbers: Use the filter method to select even numbers from the array. Example: `array.stream().filter(n -> n % 2 == 0)`.
Calculate Sum: Use the mapToInt method to convert the filtered even numbers to an inte...
OOP concepts include Encapsulation, Inheritance, Polymorphism, and Abstraction, forming the foundation of object-oriented programming.
Encapsulation: Bundling data and methods in a class. Example: A class 'Car' with attributes like 'speed' and methods like 'accelerate()'.
Inheritance: Mechanism to create a new class from an existing class. Example: 'ElectricCar' inherits from 'Car'.
Polymorphism: Ability to take many...
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Inheritance allows a class to inherit properties and methods from another class, promoting code reusability.
Inheritance is a fundamental concept in OOP (Object-Oriented Programming).
It allows a new class (subclass) to inherit attributes and methods from an existing class (superclass).
Example: If 'Animal' is a superclass, 'Dog' can be a subclass that inherits characteristics of 'Animal'.
Subclasses can also override...
Exception handling in Java manages runtime errors to maintain normal program flow.
Java uses try, catch, and finally blocks for exception handling.
Example: try { int result = 10 / 0; } catch (ArithmeticException e) { System.out.println(e.getMessage()); }
The 'finally' block executes regardless of an exception occurring.
Custom exceptions can be created by extending the Exception class.
Checked exceptions must be decla...
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.
Code to find the second largest element in an array
Iterate through the array and keep track of the largest and second largest elements
Initialize variables to store the largest and second largest elements
Compare each element with the largest and second largest elements and update accordingly
A controller is a component in the Model-View-Controller (MVC) design pattern that handles user input and updates the model and view accordingly.
Controls the flow of the application
Interacts with the model to update data
Receives input from the user and processes it
Updates the view based on changes in the model
Examples: Spring MVC Controller, JavaFX Controller
Code to print unique elements from an array of strings
Create a HashSet to store unique elements
Iterate through the array and add elements to the HashSet
Print out the elements in the HashSet to get unique elements
Capgemini Java Developer Interview Experiences
71 interviews found
Anonymous
Selected
I applied via Approached by Company and was interviewed in Dec 2024. There was 1 interview round.
(8 Questions)
- Q1. What improvements to interfaces were introduced in Java 8 that were missing in Java 7, specifically regarding static and default methods?
- Ans.
Java 8 introduced static and default methods in interfaces, allowing for method implementation and code reusability.
Java 8 introduced static methods in interfaces, allowing for method implementation directly in the interface itself.
Default methods were also introduced in Java 8, enabling interfaces to have method implementations without affecting implementing classes.
Static methods in interfaces can be called using the...
- Q2. Explain internal working of HashMap ? How to synchronize it ?
- Ans.
HashMap is a data structure that stores key-value pairs and uses hashing to efficiently retrieve values.
HashMap 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 synchronize a HashMap, you can use the synchronizedMap() m...
- Q3. Given a list of employees with their ratings, how can you sort the employees based on their ratings using the Java 8 Streaming API?
- Q4. Will the program compile if the parent class throws a runtime exception while the child class throws an arithmetic exception?
- Ans.
No, the program will not compile if the parent class throws a runtime exception while the child class throws an arithmetic exception.
In Java, if a parent class method throws a checked exception, the child class method can only throw the same exception or its subclasses.
ArithmeticException is an unchecked exception, so if the parent class throws a checked exception and the child class throws an unchecked exception, the ...
- Q5. In a Spring Boot application with two databases, how can you configure JDBC to specify which database to use?
- Ans.
Configure JDBC in Spring Boot to specify which database to use
Define multiple DataSource beans in the configuration class
Use @Primary annotation to specify the primary DataSource
Use @Qualifier annotation to specify the secondary DataSource
Inject the DataSource beans where needed in the application
- Q6. How to use a jetty server in your spring boot application ?
- Q7. Difference between @RequestParam and @PathVariable ?
- Q8. How would you handle a scenario where one microservice is awaiting a response from another microservice that is taking an extended time to respond?
- Ans.
I would implement timeout mechanisms and retries to handle the scenario of one microservice awaiting a response from another microservice taking an extended time.
Implement timeout mechanisms in the calling microservice to limit the waiting time for a response.
Set up retry logic to automatically resend the request to the slow microservice if no response is received within the specified timeout period.
Use circuit breaker...
Interview Preparation Tips
I applied via Naukri.com and was interviewed in Dec 2024. There was 1 interview round.
(8 Questions)
- Q1. SOLID principles in java. Any features in java8 which are there which follows SOLID principle
- Ans.
SOLID principles in Java focus on object-oriented design principles. Java 8 features like lambdas and streams adhere to these principles.
S - Single Responsibility Principle: Java 8 lambdas allow for defining single-purpose functions.
O - Open/Closed Principle: Java 8 streams enable extending behavior without modifying existing code.
L - Liskov Substitution Principle: Java 8 interfaces support polymorphism and substitutio...
- Q2. Singleton class in Java. How to write a code in java to make a class singleton
- Q3. What is a controller.
- Q4. Write a code so that unique elements from an array can be printed
- Ans.
Code to print unique elements from an array of strings
Create a HashSet to store unique elements
Iterate through the array and add elements to the HashSet
Print out the elements in the HashSet to get unique elements
- Q5. Write a code to find the second largest element in an array
- Ans.
Code to find the second largest element in an array
Iterate through the array and keep track of the largest and second largest elements
Initialize variables to store the largest and second largest elements
Compare each element with the largest and second largest elements and update accordingly
- Q6. What is hash collision. From which class is hashCode() and equals() method from
- Ans.
Hash collision occurs when two different inputs produce the same hash value. hashCode() and equals() methods are from Object class.
Hash collision can occur when two different objects have the same hash code value.
hashCode() method is used to get the hash code value of an object.
equals() method is used to compare two objects for equality.
- Q7. Explain circuit breaker, and how to practically implement it
- Ans.
Circuit breaker is a design pattern used to prevent cascading failures in distributed systems.
Circuit breaker monitors for failures and trips when a threshold is reached
It then redirects calls to a fallback mechanism to prevent further failures
Once the system stabilizes, the circuit breaker can be reset to allow normal operation
- Q8. Exception handling in springboot. How to implement controllerAdvice
Interview Preparation Tips
About basic test of knowledge on english & general knowledge
(4 Questions)
- Q1. Questions based on arrays
- Q2. Questions based on strings
- Q3. OOPS concept and threading
- Q4. Multithreading and some coding on array and strings
(2 Questions)
- Q1. About company policies etc
- Q2. About CTC
I applied via Naukri.com and was interviewed in Oct 2024. There was 1 interview round.
(5 Questions)
- Q1. Coding questions on java8
- Q2. Regarding microservices
- Q3. Internal working of circuit breaker
- Ans.
Circuit breaker is a design pattern used in software development to prevent system failures by temporarily stopping requests to a failing service.
Circuit breaker monitors the number of failures and opens when a threshold is reached.
When the circuit is open, requests are not sent to the failing service, preventing further failures.
After a specified time, the circuit breaker closes and allows requests to be sent again.
Ex...
- Q4. Frequency of occurrence of words
- Ans.
Frequency of occurrence of words in a given text can be calculated by counting each word and storing it in a data structure.
Split the text into words using whitespace as delimiter
Create a map to store word frequencies
Iterate through the words and update the frequency count in the map
Return the map with word frequencies
- Q5. How spring boot will work two databases
Interview Preparation Tips
Skills evaluated in this interview
Sonunigam Bar
(2 Questions)
- Q1. Explain your project Architecture
- Q2. What is Spring Security
(2 Questions)
- Q1. How to handel global exception in spring boot
- Q2. What is circuit breaker pattern
Skills evaluated in this interview
Paarul Shree
(2 Questions)
- Q1. D/F Map & FlatMap
- Q2. FunctionalInterface, SOLID, Multithreading
I applied via Approached by Company and was interviewed in Jul 2024. There was 1 interview round.
(8 Questions)
- Q1. What is static binding and dynamic binding?
- Q2. What is functional interface?
- Q3. Type of indexes in sql
- Q4. Take 2 arrays, merge them and get back an array
- Q5. Take your name as string, remove vowels and get back your name
- Q6. Sql query to get even row data
- Q7. Auto boxing and auto unboxing
- Q8. Constants in sql
- Ans.
Constants in SQL are values that remain the same throughout the execution of a query or program.
Constants can be defined using the 'CONST' keyword in SQL.
They are used to store values that do not change during the execution of a query.
Constants can be used in WHERE clauses, JOIN conditions, and other parts of a SQL query.
Example: CONST MAX_VALUE = 100;
Interview Preparation Tips
Skills evaluated in this interview
(1 Question)
- Q1. What is Functional Programming in Java 8? How to achieve pagination in Springboot? How to implement load balancing in springboot microservices? Stream API all coding questions.
Selected
I appeared for an interview in May 2025, where I was asked the following questions.
- Q1. Java development
- Q2. Full satck java
Ankit Assasin
Selected
I applied via Naukri.com and was interviewed in Apr 2024. There was 1 interview round.
(2 Questions)
- Q1. ArrayList
(); al.add(new Employee(1,"Amanda",25000,"IT")); al.add(new Employee(2,"Berlin",35000,"HR")); al.add(new Employee(3,"Caroline",40000,"IT)); al.add(new Employee(4,"Damodar",30000,"HR")); using ... - Q2. //design patterns //markers interface // example of functional interface . can you override Default method. Can you directly or do you need object. give some examples of functional interface //one try ...
- Ans.
The interview questions cover a wide range of topics including design patterns, exception handling, Hibernate, MongoDB, Java collections, Spring framework, and microservices.
Design patterns like markers interface, functional interface, and Singleton pattern are important in Java development.
Understanding exception handling with try-catch-finally blocks is crucial for handling errors in Java applications.
Knowing the dif...
Interview Preparation Tips
Skills evaluated in this interview
Capgemini Interview FAQs
Some of the top questions asked at the Capgemini Java Developer interview -
The duration of Capgemini Java Developer interview process can vary, but typically it takes about less than 2 weeks to complete.
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