Associate System Analyst

Associate System Analyst Interview Questions and Answers for Freshers

Updated 7 Jul 2025

Asked in NSE.IT

6d ago

Q. What are the OOPS concepts ? Explain all the pillers of OOPS concepts.

Ans.

OOPS concepts are the fundamental principles of Object-Oriented Programming. There are four pillars of OOPS concepts.

  • Encapsulation - binding data and functions together in a single unit (class).

  • Abstraction - hiding implementation details and showing only necessary information to the user.

  • Inheritance - creating a new class from an existing class, inheriting properties and methods.

  • Polymorphism - ability of an object to take many forms, method overloading and overriding.

Asked in NSE.IT

4d ago

Q. What are collections in java ? Explain all the collections..

Ans.

Collections in Java are classes that implement data structures like lists, sets, maps, etc.

  • Collections are used to store and manipulate groups of objects

  • List interface is used to store ordered elements, ArrayList and LinkedList are implementations of List

  • Set interface is used to store unique elements, HashSet and TreeSet are implementations of Set

  • Map interface is used to store key-value pairs, HashMap and TreeMap are implementations of Map

  • Collections class provides utility me...read more

Asked in NSE.IT

2d ago

Q. What is multi-threading ? How to start a new thread ? What is synchronisation ?

Ans.

Multi-threading is a technique of executing multiple threads concurrently. New threads can be started using the Thread class. Synchronization is the process of controlling the access to shared resources by multiple threads.

  • Multi-threading allows multiple threads to run concurrently, improving performance.

  • New threads can be started by creating a new instance of the Thread class and calling its start() method.

  • Synchronization is used to prevent multiple threads from accessing sh...read more

Asked in NSE.IT

2d ago

Q. What are Joins? Explain all types of joins.

Ans.

Joins are used to combine data from two or more tables based on a related column.

  • Inner join returns only the matching rows from both tables.

  • Left join returns all rows from the left table and matching rows from the right table.

  • Right join returns all rows from the right table and matching rows from the left table.

  • Full outer join returns all rows from both tables.

  • Cross join returns the Cartesian product of both tables.

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Asked in NSE.IT

4d ago

Q. What are the types of JDBC statements?

Ans.

There are three types of JDBC statements: Statement, PreparedStatement, and CallableStatement.

  • Statement: used for executing a static SQL statement

  • PreparedStatement: used for executing a precompiled SQL statement with parameters

  • CallableStatement: used for executing a stored procedure or function

3d ago

Q. What is an IOC container?

Ans.

IOC container is a software component that manages the dependencies between objects.

  • IOC stands for Inversion of Control

  • It is used to achieve loose coupling between objects

  • It allows objects to be created and wired together at runtime

  • Examples include Spring Framework's ApplicationContext and Google Guice's Injector

  • IOC containers use dependency injection to provide objects with their dependencies

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Q. What is the difference between encapsulation and abstraction?

Ans.

Encapsulation is hiding the implementation details while abstraction is hiding the complexity of the system.

  • Encapsulation is achieved through access modifiers like private, protected, and public.

  • Abstraction is achieved through abstract classes and interfaces.

  • Encapsulation is used to protect the data from outside interference.

  • Abstraction is used to provide a simplified view of the system.

  • Encapsulation is a way to achieve information hiding.

  • Abstraction is a way to achieve modul...read more

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