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Vastustruct Intern Interview Questions and Answers

Updated 3 Jul 2024

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Intern Interview Questions & Answers

user image Musaddiq Momin

posted on 3 Jul 2024

Interview experience
5
Excellent
Difficulty level
-
Process Duration
-
Result
-
Round 1 - Technical 

(1 Question)

  • Q1. Basics of staad pro and AutoCAD

Interview questions from similar companies

Interview experience
3
Average
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
Selected Selected

I applied via Approached by Company and was interviewed in Jul 2024. There were 2 interview rounds.

Round 1 - Case Study 

It was regarding the case study of Punjab National Bank and pnbmetlife.

Round 2 - Assignment 

It was regarding basic financial knowledge.

Interview Preparation Tips

Topics to prepare for Pie Infocomm Intern interview:
  • Basic financial knowledge
  • Fintech
Interview preparation tips for other job seekers - Either you have a very strong conceptual knowledge, companies will train you according to their need or a good internship and practical knowledge and skills.
Interview experience
3
Average
Difficulty level
-
Process Duration
-
Result
-
Round 1 - One-on-one 

(2 Questions)

  • Q1. Tell me somenthi g about
  • Ans. 

    I believe there might be a typo in the question. Could you please clarify?

    • Ask for clarification on the specific topic or information the interviewer is looking for.

    • Offer to provide more details or examples once the question is clarified.

  • Answered by AI
  • Q2. What is your name
Round 2 - One-on-one 

(2 Questions)

  • Q1. What is your name
  • Q2. What is your address
Round 3 - HR 

(2 Questions)

  • Q1. What is salary expect
  • Q2. What is job expect
Interview experience
4
Good
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
Selected Selected

I applied via Naukri.com and was interviewed before Jun 2023. There were 3 interview rounds.

Round 1 - Aptitude Test 

Math and basic general knowledge questions

Round 2 - One-on-one 

(2 Questions)

  • Q1. Proud moment which you have felt in life
  • Q2. What are your hobbies
Round 3 - Case Study 

Trending topics on current affairs

Interview experience
4
Good
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
Selected Selected

I applied via Referral and was interviewed in May 2024. There were 2 interview rounds.

Round 1 - Case Study 

Cost savings for a merged entity

Round 2 - One-on-one 

(2 Questions)

  • Q1. Previous work experience
  • Q2. Why do you want to join Accenture
Interview experience
5
Excellent
Difficulty level
-
Process Duration
-
Result
-
Round 1 - Technical 

(1 Question)

  • Q1. Projects Intro

Interview Preparation Tips

Interview preparation tips for other job seekers - Friendly
Interview experience
3
Average
Difficulty level
Hard
Process Duration
2-4 weeks
Result
Selected Selected

I appeared for an interview in Feb 2025, where I was asked the following questions.

  • Q1. Explain the difference between ArrayList and LinkedList in Java. When would you choose one over the other?
  • Ans. 

    ArrayList is a resizable array, while LinkedList is a doubly linked list. Choose based on performance needs.

    • ArrayList: Faster for random access (O(1)). Example: list.get(5);

    • LinkedList: Faster for insertions/deletions (O(1)) at both ends. Example: list.addFirst('A');

    • ArrayList: Uses less memory overhead compared to LinkedList.

    • LinkedList: Better for frequent insertions/deletions in the middle of the list.

    • ArrayList: Requir...

  • Answered by AI
  • Q2. What are the advantages and disadvantages of using Java’s synchronized keyword for thread synchronization? Can you explain how the ReentrantLock compares to synchronized?
  • Ans. 

    Java's synchronized keyword provides thread safety but has limitations compared to ReentrantLock.

    • Advantages of synchronized: Simple to use, built-in language feature.

    • Disadvantages of synchronized: Can lead to thread contention, no timeout options.

    • ReentrantLock allows more flexibility: supports tryLock(), lockInterruptibly().

    • ReentrantLock can be more efficient in high contention scenarios.

    • Example of synchronized: synchr...

  • Answered by AI
  • Q3. What is the difference between == and .equals() in Java? When should each be used, and what issues can arise from improper usage?
  • Ans. 

    == checks reference equality, while .equals() checks value equality in Java. Use .equals() for content comparison.

    • == compares object references (memory addresses). Example: String a = new String('test'); String b = new String('test'); a == b returns false.

    • .equals() compares actual content of objects. Example: a.equals(b) returns true.

    • Use == for primitive types (int, char, etc.) and .equals() for objects.

    • Improper use of...

  • Answered by AI
  • Q4. How does the Java garbage collector work? Can you describe the different types of garbage collection algorithms available in Java?
  • Ans. 

    Java's garbage collector automatically manages memory by reclaiming unused objects, improving performance and preventing memory leaks.

    • Garbage Collection (GC) is the process of automatically identifying and disposing of objects that are no longer needed.

    • Java uses several GC algorithms, including Serial, Parallel, CMS (Concurrent Mark-Sweep), and G1 (Garbage-First).

    • The Serial GC is a simple, single-threaded collector sui...

  • Answered by AI
  • Q5. What are the main features of Java 8? Can you explain how lambdas and the Stream API have changed the way Java applications are written?
  • Ans. 

    Java 8 introduced lambdas, Stream API, and other features that enhance functional programming and improve code readability.

    • Lambdas: Enable concise representation of functional interfaces. Example: (x, y) -> x + y.

    • Stream API: Allows processing sequences of elements (collections) in a functional style. Example: list.stream().filter(x -> x > 10).collect(Collectors.toList()).

    • Default Methods: Interfaces can have me...

  • Answered by AI
  • Q6. Describe the differences between checked and unchecked exceptions in Java. Provide examples and explain how to handle them properly.
  • Ans. 

    Checked exceptions must be declared or handled; unchecked exceptions do not require explicit handling.

    • Checked exceptions are subclasses of Exception but not of RuntimeException.

    • Example of checked exception: IOException, which must be caught or declared.

    • Unchecked exceptions are subclasses of RuntimeException.

    • Example of unchecked exception: NullPointerException, which does not need to be declared.

    • Checked exceptions are t...

  • Answered by AI
  • Q7. What is the Java Memory Model, and how does it affect multithreading and synchronization? How does volatile help ensure memory visibility?
  • Ans. 

    The Java Memory Model defines how threads interact through memory, ensuring visibility and ordering of shared variables.

    • The Java Memory Model (JMM) specifies how threads interact with memory, ensuring consistency and visibility of shared variables.

    • It defines rules for visibility, atomicity, and ordering of operations in a multithreaded environment.

    • Without proper synchronization, threads may see stale or inconsistent da...

  • Answered by AI
  • Q8. Can you explain the difference between method overloading and method overriding in Java? Provide examples where each should be used.
  • Ans. 

    Method overloading allows multiple methods with the same name but different parameters; overriding allows subclass methods to replace superclass methods.

    • Method Overloading: Same method name, different parameter types or counts.

    • Example of Overloading: 'int add(int a, int b)' and 'double add(double a, double b)'.

    • Use Overloading for convenience and readability when performing similar operations.

    • Method Overriding: Same met...

  • Answered by AI
  • Q9. What are functional interfaces in Java? How do they work with lambda expressions? Provide an example of a custom functional interface.
  • Ans. 

    Functional interfaces in Java are interfaces with a single abstract method, enabling lambda expressions for concise code.

    • A functional interface has exactly one abstract method.

    • They can have multiple default or static methods.

    • Common examples include Runnable, Callable, and Comparator.

    • Lambda expressions provide a clear and concise way to implement functional interfaces.

    • Example of a custom functional interface: @Functiona...

  • Answered by AI
  • Q10. What is a Java Stream, and how does it differ from an Iterator? Explain how Streams can be used to process collections efficiently.
  • Ans. 

    Java Streams provide a functional approach to processing sequences of elements, unlike Iterators which are imperative.

    • Streams are part of the Java 8+ API, enabling functional-style operations on collections.

    • Unlike Iterators, Streams do not store data; they process data on-the-fly.

    • Streams support operations like map, filter, and reduce, allowing for concise and readable code.

    • Example: List<String> names = Arrays.as...

  • Answered by AI
  • Q11. Explain the concept of immutability in Java. How does the String class achieve immutability, and what are the advantages of immutable objects?
  • Ans. 

    Immutability in Java means objects cannot be modified after creation, enhancing security and performance.

    • 1. Immutability: Once created, an object's state cannot be changed.

    • 2. String Class: Strings in Java are immutable; any modification creates a new String object.

    • 3. Example: String s1 = "Hello"; s1 = s1 + " World!"; // s1 now points to a new String object.

    • 4. Advantages: Thread-safe, easier to cache, and can be used as...

  • Answered by AI
  • Q12. What is the difference between final, finally, and finalize in Java? Provide examples to illustrate their usage.
  • Ans. 

    final, finally, and finalize serve different purposes in Java: variable declaration, exception handling, and garbage collection respectively.

    • final: Used to declare constants. Example: final int MAX_VALUE = 100;

    • finally: Block that executes after try-catch, regardless of exceptions. Example: try { ... } catch { ... } finally { ... }

    • finalize: Method called by the garbage collector before an object is removed. Example: pro

  • Answered by AI
  • Q13. Explain the Singleton design pattern in Java. How can you implement it safely to ensure thread safety?
  • Ans. 

    The Singleton pattern restricts instantiation of a class to one object, ensuring controlled access to that instance.

    • 1. The Singleton pattern ensures a class has only one instance and provides a global point of access to it.

    • 2. Common implementations include lazy initialization, eager initialization, and double-checked locking.

    • 3. Lazy initialization: Create the instance when it is needed, using synchronized method for th...

  • Answered by AI
  • Q14. What are Java annotations, and how are they used in frameworks like Spring? Explain the difference between built-in and custom annotations.
  • Ans. 

    Java annotations provide metadata for classes, methods, and fields, enhancing functionality in frameworks like Spring.

    • Annotations are metadata that provide information about the program but are not part of the program itself.

    • In Spring, annotations like @Component, @Service, and @Controller are used for defining beans and their roles.

    • Built-in annotations include @Override, @Deprecated, and @SuppressWarnings, which serve...

  • Answered by AI
  • Q15. How do Java Streams handle parallel processing? What are the potential pitfalls of using parallel streams, and how can they be mitigated?
  • Ans. 

    Java Streams enable parallel processing for efficient data handling but come with potential pitfalls that need careful management.

    • Java Streams can be processed in parallel using the 'parallelStream()' method, which divides the workload across multiple threads.

    • Parallel streams utilize the Fork/Join framework, allowing tasks to be split and executed concurrently, improving performance for large datasets.

    • Potential pitfall...

  • Answered by AI
  • Q16. Explain the difference between ArrayList and LinkedList in Java. ArrayList is implemented as a dynamic array, while LinkedList is a doubly linked list. ArrayList provides fast random access (O(1) complexi...
  • Q17. What are the advantages and disadvantages of using Java’s synchronized keyword for thread synchronization? The synchronized keyword ensures that only one thread can access a block of code at a time. It pr...
  • Q18. What is the difference between == and .equals() in Java? == checks for reference equality, meaning it compares memory addresses. equals() checks for value equality, which can be overridden in user-defined...
  • Ans. 

    == checks reference equality; .equals() checks value equality, can be overridden for custom comparison.

    • == compares memory addresses: new String("hello") == new String("hello") returns false.

    • .equals() compares actual content: "hello".equals("hello") returns true.

    • Override equals() when logical equality differs from reference equality, e.g., in custom classes.

    • When overriding equals(), also override hashCode() to maintain ...

  • Answered by AI
  • Q19. How does the Java garbage collector work? Garbage collection in Java automatically reclaims memory occupied by unused objects. The JVM has different types of GC algorithms, including Serial, Parallel, CMS...
  • Ans. 

    Java's garbage collector automatically manages memory, reclaiming space from unused objects through various algorithms.

    • Garbage collection in Java is automatic, freeing developers from manual memory management.

    • The JVM uses different GC algorithms: Serial, Parallel, CMS, and G1, each with unique characteristics.

    • Memory is divided into Young Generation (short-lived objects) and Old Generation (long-lived objects).

    • Minor GC ...

  • Answered by AI
  • Q20. What are the main features of Java 8? Java 8 introduced lambda expressions, enabling functional-style programming. The Stream API allows efficient data processing with map, filter, and reduce operations. ...
  • Ans. 

    Lambda expressions enhance Java code readability and maintainability by simplifying syntax and promoting functional programming.

    • Concise Syntax: Lambda expressions reduce boilerplate code. For example, instead of writing an anonymous class for a Runnable, you can use: `Runnable r = () -> System.out.println("Hello");`

    • Improved Readability: Code becomes more expressive. For instance, using `list.forEach(item -> Syste...

  • Answered by AI
Interview experience
5
Excellent
Difficulty level
-
Process Duration
Less than 2 weeks
Result
-

I applied via Job Portal

Round 1 - Resume Shortlist 
Pro Tip by AmbitionBox:
Keep your resume crisp and to the point. A recruiter looks at your resume for an average of 6 seconds, make sure to leave the best impression.
View all tips
Round 2 - Aptitude Test 

First round was based on logical questions and was taken on hacker earth

Round 3 - Technical 

(1 Question)

  • Q1. First question was based on rotating a matrix by 90 degrees
Interview experience
3
Average
Difficulty level
Hard
Process Duration
2-4 weeks
Result
Selected Selected

I appeared for an interview in Feb 2025, where I was asked the following questions.

  • Q1. Explain the difference between ArrayList and LinkedList in Java. When would you choose one over the other?
  • Ans. 

    ArrayList uses a dynamic array for storage, while LinkedList uses a doubly linked list structure.

    • ArrayList provides fast random access (O(1)) but slow insertions/deletions (O(n)). Example: accessing elements by index.

    • LinkedList allows fast insertions/deletions (O(1)) but slower random access (O(n)). Example: adding/removing elements at the beginning.

    • ArrayList is preferred when you need frequent access to elements and f...

  • Answered by AI
  • Q2. What are the advantages and disadvantages of using Java’s synchronized keyword for thread synchronization? Can you explain how the ReentrantLock compares to synchronized?
  • Ans. 

    Java's synchronized keyword offers thread safety but has limitations compared to ReentrantLock.

    • Advantages of synchronized: Simple to use and understand.

    • Disadvantages of synchronized: Can lead to thread contention and performance issues.

    • ReentrantLock allows more flexibility, such as tryLock() and timed lock attempts.

    • ReentrantLock supports fairness policies, which can help avoid starvation.

    • Synchronized blocks are tied to...

  • Answered by AI
  • Q3. What is the difference between == and .equals() in Java? When should each be used, and what issues can arise from improper usage?
  • Ans. 

    In Java, '==' checks reference equality, while '.equals()' checks value equality. Use them appropriately to avoid bugs.

    • == compares object references, checking if two references point to the same object in memory.

    • Example: String a = new String('test'); String b = new String('test'); a == b returns false.

    • .equals() compares the actual content of the objects, checking if they are logically equivalent.

    • Example: a.equals(b) r...

  • Answered by AI
  • Q4. How does the Java garbage collector work? Can you describe the different types of garbage collection algorithms available in Java?
  • Ans. 

    Java's garbage collector automatically manages memory by reclaiming unused objects, improving performance and preventing memory leaks.

    • Java uses automatic garbage collection to manage memory, freeing developers from manual memory management.

    • The main garbage collection algorithms in Java include: Serial GC, Parallel GC, Concurrent Mark-Sweep (CMS), and G1 GC.

    • Serial GC is a simple, single-threaded collector suitable for s...

  • Answered by AI
  • Q5. What are the main features of Java 8? Can you explain how lambdas and the Stream API have changed the way Java applications are written?
  • Ans. 

    Java 8 introduced lambdas, Stream API, and other features that enhance functional programming and simplify code.

    • Lambdas: Enable concise representation of functional interfaces. Example: (x, y) -> x + y.

    • Stream API: Facilitates functional-style operations on collections. Example: list.stream().filter(x -> x > 10).collect(Collectors.toList()).

    • Default Methods: Allow adding new methods to interfaces without breakin...

  • Answered by AI
  • Q6. Describe the differences between checked and unchecked exceptions in Java. Provide examples and explain how to handle them properly.
  • Ans. 

    Checked exceptions must be handled or declared, while unchecked exceptions do not require explicit handling.

    • Checked exceptions are subclasses of Exception (excluding RuntimeException). Example: IOException.

    • Unchecked exceptions are subclasses of RuntimeException. Example: NullPointerException.

    • Checked exceptions must be either caught using try-catch or declared in the method signature with throws.

    • Unchecked exceptions can...

  • Answered by AI
  • Q7. What is the Java Memory Model, and how does it affect multithreading and synchronization? How does volatile help ensure memory visibility?
  • Ans. 

    The Java Memory Model defines how threads interact through memory, ensuring visibility and ordering of shared variables.

    • The Java Memory Model (JMM) specifies how threads interact through memory and what behaviors are allowed.

    • It defines rules for visibility, atomicity, and ordering of operations in a multithreaded environment.

    • Without proper synchronization, threads may see stale data due to caching or compiler optimizat...

  • Answered by AI
  • Q8. Can you explain the difference between method overloading and method overriding in Java? Provide examples where each should be used.
  • Ans. 

    Method overloading allows multiple methods with the same name but different parameters; overriding replaces a superclass method in a subclass.

    • Method Overloading: Same method name, different parameters (type, number, or both).

    • Example of Overloading: 'int add(int a, int b)' and 'double add(double a, double b)'.

    • Use Overloading for convenience and readability when methods perform similar functions.

    • Method Overriding: Redefi...

  • Answered by AI
Interview experience
4
Good
Difficulty level
Hard
Process Duration
4-6 weeks
Result
Selected Selected

I appeared for an interview in Aug 2024.

Round 1 - Interview Questions 

(3 Questions)

  • Q1. What is a transaction in DBMS, what are ACID properties? Explain the difference between SQL and NoSQL databases. How would you optimize a slow running query?
  • Ans. 

    A transaction in DBMS is a unit of work that must be executed as a whole. ACID properties ensure data integrity. SQL is relational, NoSQL is non-relational.

    • A transaction in DBMS is a set of operations that must be executed as a single unit.

    • ACID properties (Atomicity, Consistency, Isolation, Durability) ensure data integrity in transactions.

    • SQL databases are relational and use structured query language, while NoSQL data...

  • Answered by AI
  • Q2. Define encapsulation and provide an example. Discuss the principles of inheritance and polymorphism.
  • Ans. 

    Encapsulation is the concept of bundling data and methods that operate on the data into a single unit. Inheritance allows a class to inherit attributes and methods from another class. Polymorphism allows objects of different classes to be treated as objects of a common superclass.

    • Encapsulation helps in data hiding and abstraction

    • Example: A class 'Car' encapsulates data like make, model, and methods like start(), stop()

    • ...

  • Answered by AI
  • Q3. Explain how to detect a cycle in a linked list.
  • Ans. 

    Use Floyd's Tortoise and Hare algorithm to detect a cycle in a linked list.

    • Start with two pointers, slow and fast, moving at different speeds.

    • If there is a cycle, the two pointers will eventually meet at some point.

    • If there is no cycle, the fast pointer will reach the end of the list.

    • Example: 1->2->3->4->5->2 (cycle at node 2), slow and fast pointers will meet at node 2.

  • Answered by AI

Interview Preparation Tips

Interview preparation tips for other job seekers - Be confident in interview. Explain your answers properly

Vastustruct Interview FAQs

How many rounds are there in Vastustruct Intern interview?
Vastustruct interview process usually has 1 rounds. The most common rounds in the Vastustruct interview process are Technical.

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Vastustruct Intern Interview Process

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4.3

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5.0

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4.3

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