Viral Fission Java Developer Interview Questions and Answers

Q1. They asked some core Java Concepts,String,Java 8,SpringBoot Architecture,Stream API code
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Q1. Ask to write code for equal and hashcode in notepad
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Q2. Type of Collections and its internal working
Ans. 
Java collections are data structures that store and manipulate groups of objects.
• Types of collections include List, Set, Map, Queue, etc.

• Internal workings involve data structures like arrays, linked lists, hash tables, etc.

• Collections framework provides interfaces and classes for working with collections.
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Q3. Count number of occurrence of string from Array
Ans. 
Count occurrences of a specific string in an array of strings.
• Iterate through the array and use a HashMap to store the count of each string.

• Use the string as key and increment the count each time it is encountered.

• Return the count of the specific string at the end.
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Q4. Write a code using stream
Ans. 
Using stream to filter a list of strings
• Use the filter method to apply a predicate to each element in the stream

• Convert the stream back to a list using the collect method
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Quants,logical,verbal questions were asked in this round

Gd was held within 10 participants with a abstract topic

Q1. Tell me about yourself and your key strength and weakness
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Q2. The rest of the interview was entirely filled with technical questions
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Q3. Data structures questions were asked
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Q1. Java 8 features
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Q2. Junit code writing
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Q1. Reason for job change
Ans. 
Seeking new challenges and growth opportunities in a dynamic environment.
• Desire for professional growth

• Seeking new challenges

• Interested in a more dynamic work environment
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Q2. Past experience
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Q1. Microservices communication
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Q2. Hash map working
Ans. 
Hash map is a data structure that stores key-value pairs and allows for fast retrieval of values based on keys.
• Hash map uses hashing to map keys to their corresponding values.

• It allows for constant time complexity O(1) for insertion, deletion, and retrieval operations.

• Example: HashMap map = new HashMap<>(); map.put("key", 123); int value = map.get("key");
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Q1. Ask to write code for equal and hashcode in notepad
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Q2. Type of Collections and its internal working
Ans. 
Java collections are data structures that store and manipulate groups of objects.
• Types of collections include List, Set, Map, Queue, etc.

• Internal workings involve data structures like arrays, linked lists, hash tables, etc.

• Collections framework provides interfaces and classes for working with collections.

• Example: ArrayList internally uses an array to store elements.
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Q3. Count number of occurrence of string from Array
Ans. 
Count occurrences of a specific string in an array of strings.
• Iterate through the array and compare each element with the target string.

• Increment a counter each time the target string is found.

• Return the final count of occurrences.
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Q1. What is a wrapper class in java
Ans. 
Wrapper classes in Java are classes that allow primitive data types to be accessed as objects.
• Wrapper classes provide a way to convert primitive data types into objects.

• They are used when an object is required, such as in collections or generics.

• Examples include Integer for int, Double for double, Boolean for boolean, etc.
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Q2. Encapsulation with an example?
Ans. 
Encapsulation is the concept of bundling data and methods that operate on the data into a single unit.
• Encapsulation helps in hiding the internal state of an object and restricting access to it.

• It allows for better control over the data by preventing external code from directly modifying it.

• Example: A class 'Car' with private variables like 'model', 'year', and public methods like 'getYear()' and 'setModel()'.
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Q3. What is the difference between hashmap and hashset
Ans. 
HashMap is a key-value pair collection while HashSet is a collection of unique elements.
• HashMap stores key-value pairs while HashSet stores unique elements.

• HashMap allows duplicate values but keys must be unique, while HashSet does not allow duplicates.

• HashMap uses keys to retrieve values, while HashSet does not have keys and values are the same.

• Example: HashMap map = new HashMap<>(); HashSet set = new
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Q4. What is the usage of optinal class
Ans. 
Optional class is used to handle null values in Java, preventing NullPointerExceptions.
• Optional class was introduced in Java 8 to provide a more elegant way of handling null values.

• It encourages developers to explicitly handle the presence or absence of a value, rather than relying on null checks.

• Optional class has methods like isPresent(), get(), orElse(), etc. to work with optional values.

• Using Optional class can mak...read more
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Q1. Just basic question tell me about yourself
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Q1. Count duplicate from int array
Ans. 
Count duplicates in an int array
• Create a HashMap to store the count of each element in the array

• Iterate through the array and update the count in the HashMap

• Count the elements with count greater than 1 as duplicates
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