10 Common Interview Questions to get into Accenture as a Java Developer

1. What are the key features of Java?
Answer:

Object-Oriented: Supports OOP principles like inheritance and polymorphism.
Platform Independent: Uses JVM to run the same code on different OS.
Robust and Secure: Exception handling and garbage collection.
Multithreaded: Supports concurrent execution using threads.
High Performance: Just-In-Time (JIT) compiler optimizes bytecode execution.
2. Explain the difference between JDK, JRE, and JVM.
Answer:

JDK (Java Development Kit): Full-featured software for development, includes JRE + compilers + tools.
JRE (Java Runtime Environment): Runtime environment to run Java apps, includes JVM + libraries.
JVM (Java Virtual Machine): Converts bytecode to machine code; ensures portability and security.
3. What is the difference between == and .equals() in Java?
Answer:

== compares references (memory addresses).
.equals() compares actual values (overridden in classes like String, Integer).
Example:

String s1 = new String("Hello");
String s2 = new String("Hello");
4. What are the four main OOP principles?
Answer:

Encapsulation: Binding data and methods (e.g., private variables + public getters/setters).
Inheritance: Code reuse from parent classes.
Polymorphism: Many forms – method overloading/overriding.
Abstraction: Hiding internal details, exposing only functionality (e.g., abstract classes, interfaces).
5. How does HashMap work in Java?
Answer:

Stores key-value pairs.
Uses hashCode() to find a bucket, and equals() to resolve collisions.
In Java 8+, uses a LinkedList or Tree for collision handling.
6. What’s the difference between ArrayList and LinkedList?
Answer:

ArrayList: Uses a dynamic array. Fast for random access, slow for inserts/removals.
LinkedList: Uses doubly linked list. Fast for inserts/removals, slow for access.
7. Explain exception handling in Java.
Answer:

Handled using try-catch-finally.
Checked exceptions (e.g., IOException) must be declared or handled.
Unchecked exceptions (e.g., NullPointerException) occur at runtime.
try {
int result = 10 / 0;
} catch (ArithmeticException e) {
} finally {
}
8. What is multithreading and how is it implemented in Java?
Answer:

Multithreading allows simultaneous execution of two or more threads.
You can extend Thread class or implement Runnable interface.
class MyThread extends Thread {
public void run() {
}
}
9. What is the use of Spring Boot in Java development?
Answer:

Simplifies Spring application setup with auto-configuration.
Provides an embedded server (like Tomcat), so no deployment hassles.
Uses annotations to reduce boilerplate.
10. What is a RESTful web service?
Answer:

REST stands for Representational State Transfer.
Uses HTTP methods (GET, POST, PUT, DELETE) for communication.
Example: A GET request to /users/1 fetches user with ID 1.

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[Anubhab_Mondal]

Very informative video dada..and ami recently Accenture internship peyechi, but akhono document verification e cholche.. don't know about kobe start hobe.
Btw tomar video follow kori, khub valo lage!!❤

[rupankardas]

Dada spoken English ta tomar moto ki vave sikbo ektu bolo plzzz

[chakrabarti]

Dada as a fresher campus placement chara kikore Accenture e pawa jabe clg e duto code good apti interview er porew unfortunately selection hyni ..onno kibhabe as a fresher entry newa jabe?