Fujitsu Interview Questions, Process, and Tips

General aptitude and mcq based technical questions on data structure and algorithms

Q1. Explain oops concepts with example
Ans. 
OOPs concepts are fundamental principles of object-oriented programming like inheritance, encapsulation, polymorphism, and abstraction.
• Inheritance: Allows a class to inherit properties and behavior from another class. Example: Animal class can be inherited by Dog class.

• Encapsulation: Bundling data and methods that operate on the data into a single unit. Example: Using private variables and public methods in a class.

• Pol...read more
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Q2. Personal interview
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Q1. Tell me about yourself!
Ans. Tell about your education and familty background in brief. Tell about your technical skills. Tell your relevant experience. Highlight your strenghths. Be confident. Be honest.
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Q1. Overall technologies
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Q2. What is Aws, Cloud
Ans. 
AWS (Amazon Web Services) is a cloud computing platform that offers a wide range of services for businesses and individuals.
• AWS is a secure cloud services platform offered by Amazon.

• It provides a variety of services such as computing power, storage options, and networking capabilities.

• Users can access these services on a pay-as-you-go basis, allowing for scalability and cost-effectiveness.

• Examples of AWS services inclu...read more
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Q3. Cloud is nothing but pay as you go model.
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Round duration - 60 Minutes
Round difficulty - Medium

In this round, I was first asked a simple coding question related to Linked List and this was later followed by some questions from Java, Java Collections and OOPS.

Q1. 
Reverse Linked List Problem Statement
Given a singly linked list of integers, return the head of the reversed linked list.
Example:
Initial linked list: 1 -> 2 -> 3 -> 4 -> NULL
Reversed link...read more
Ans. 
Approach : Iterative(Using Stack) - 

1) Store the nodes(values and address) in the stack until all the values are entered.
2) Once all entries are done, Update the Head pointer to the last location(i.e the last value).
3) Start popping the nodes(value and address) and store them in the same order until the stack is empty.
4) Update the next pointer of last Node in the stack by NULL.

TC: O(n)
SC:O(n)
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Q2. How does ConcurrentHashMap work in Java?
Ans. 
According to ConcurrentHashMap Oracle docs,

The constructor of ConcurrentHashMap looks like this :

public ConcurrentHashMap (int initialCapacity, float loadFactor, int concurrencyLevel)

So the above line creates a new, empty map with the specified initial capacity, load factor and concurrency level.
where,
Important Parameters to consider from ConcurrentHashMap Constructor :

initialCapacity - the initial capacity. The implem...read more
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Q3. How many types of memory areas are allocated by the JVM?
Ans. 
1) Class(Method) Area: Class Area stores per-class structures such as the runtime constant pool, field, method data, and the code for methods.

2) Heap: It is the runtime data area in which the memory is allocated to the objects

3) Stack: Java Stack stores frames. It holds local variables and partial results, and plays a part in method invocation and return. Each thread has a private JVM stack, created at the same time as...read more
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Q4. Can you differentiate between ArrayList and Vector in Java?
Ans. 
Following are the differences between ArrayList and Vector in java :

1) Synchronization : Vector is synchronized, which means that only one thread can access the code at a time, however, ArrayList is not synchronized, which means that multiple threads can operate on ArrayList at the same time. 

2)Data Growth : Both ArrayList and Vector dynamically expand and shrink to make the most use of storage space, but the mann...read more
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Q5. What is the difference between HashSet and HashMap in Java?
Ans. 
Hash Set : 
1) It implements the Set Interface.
2) It does not allow duplicate values.
3) While adding an element it requires only one object as a parameter.
4) Internally, HashSet uses HashMap to add entries. The key K in a HashSet is the argument supplied in the add(Object) method. For each value supplied in the add(Object) method, Java assigns a dummy value.
5) It is slower than HashMap.


Hash Map : 
1) It impleme...read more
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Q6. What do you mean by data encapsulation?
Ans. 
1) Data Encapsulation is an Object-Oriented Programming concept of hiding the data attributes and their behaviors in a single unit.

2) It helps developers to follow modularity while developing software by ensuring that each object is independent of other objects by having its own methods, attributes, and functionalities.

3) It is used for the security of the private properties of an object and hence serves the purpose of
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Q7. Can static methods be overridden?
Ans. 
1) No. Declaration of static methods having the same signature can be done in the subclass but run time polymorphism can not take place in such cases.

2) Overriding or dynamic polymorphism occurs during the runtime, but the static methods are loaded and looked up at the compile time statically. Hence, these methods can't be overridden.
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Round duration - 50 Minutes
Round difficulty - Medium

This round had questions revolving around Spring Boot and Automation Testing frameworks like Selenium.

Q1. What are the basic annotations that Spring Boot offers?
Ans. 
The primary annotations that Spring Boot offers reside in its "org.springframework.boot.autoconfigure" and its sub-
packages. Here are a couple of basic ones :

@EnableAutoConfiguration – to make Spring Boot look for auto-configuration beans on its classpath and
automatically apply them.

@SpringBootApplication – used to denote the main class of a Boot Application. This annotation combines
@Configuration, @EnableAutoConfigura...read more
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Q2. Can you explain the @RestController annotation in Spring Boot?
Ans. 
It is a combination of @Controller and @ResponseBody, used for creating a restful controller. It converts the
response to JSON or XML. It ensures that data returned by each method will be written straight into the response
body instead of returning a template.
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Q3. What is dependency injection?
Ans. 
The process of injecting dependent bean objects into target bean objects is called dependency injection.

1) Setter Injection: The IOC container will inject the dependent bean object into the target bean object by calling the
setter method.

2) Constructor Injection: The IOC container will inject the dependent bean object into the target bean object by calling
the target bean constructor.

3) Field Injection: The IOC container...read more
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Q4. What does the @SpringBootApplication annotation do internally?
Ans. 
The @SpringBootApplication annotation is equivalent to using @Configuration, @EnableAutoConfiguration,
and @ComponentScan with their default attributes. Spring Boot enables the developer to use a single annotation
instead of using multiple. But, as we know, Spring provided loosely coupled features that we can use for each
annotation as per our project needs.
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Q5. What is the starter dependency of the Spring Boot module?
Ans. 
Spring boot provides numbers of starter dependency, here are the most commonly used -

1) Data JPA starter.
2) Test Starter.
3) Security starter.
4) Web starter.
5) Mail starter.
6) Thymeleaf starter.
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Q6. Explain the difference between findElement() and findElements() in Selenium.
Ans. 
findElement(): command is used for finding a particular element on a web page, it is used to return an object of the
first found element by the locator.

Eg: WebElement element = driver.findElement(By.id(example));

findElements(): command is used for finding all the elements in a web page specified by the locator value. The return
type of this command is the list of all the matching web elements.

Eg: List elementList = drive
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Q7. What are the different types of waits available in Selenium WebDriver?
Ans. 
There are two types of waits available in WebDriver :
Implicit Wait
Explicit Wait

Implicit Wait : Implicit waits are used to provide a default waiting time (say 30 seconds) between each consecutive test
step/command across the entire test script. Thus, the subsequent test step would only execute when the 30 seconds
have elapsed after executing the previous test step/command.


Explicit Wait : Explicit waits are used to halt th...read more
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Round duration - 30 Minutes
Round difficulty - Easy

This was a Technical Cum HR round where I was first asked some basic Java related concepts and then we discussed
about my expectations from the company , learnings and growth in the forthcomig years. I would suggest be honest and
try to communicate your thoughts properly in these type of rounds to maximise your chances of getting selected.