LTIMindtree Java Developer Interview Questions and Answers

Java is a statically typed, compiled language, while Python is dynamically typed and interpreted, each with unique strengths.

• Typing: Java is statically typed, meaning variable types are declared at compile-time (e.g., int num = 5;), while Python is dynamically typed (e.g., num = 5).

• Compilation: Java code is compiled into bytecode and runs on the Java Virtual Machine (JVM), whereas Python code is interpreted at run...read more

Encapsulation is a fundamental OOP principle that restricts direct access to an object's data and methods.

• Encapsulation combines data and methods into a single unit called a class.

• It restricts access to the internal state of an object using access modifiers (private, protected, public).

• Example: A class 'BankAccount' can have private fields like 'balance' and public methods like 'deposit()' and 'withdraw()' to mani...read more

OOP concepts in Java include Encapsulation, Inheritance, Polymorphism, and Abstraction, enabling modular and reusable code.

• Encapsulation: Bundling data and methods. Example: Using private variables with public getters/setters.

• Inheritance: Deriving new classes from existing ones. Example: class Dog extends Animal.

• Polymorphism: Methods can do different things based on the object. Example: method overriding in subcla...read more

Java is a versatile, object-oriented programming language used for building platform-independent applications.

• Object-Oriented: Java supports concepts like inheritance, encapsulation, and polymorphism. Example: Creating a class 'Animal' and subclasses 'Dog' and 'Cat'.

• Platform Independence: Java applications can run on any device with a Java Virtual Machine (JVM). Example: Write once, run anywhere.

• Rich API: Java pro...read more

In Java, 'final' is a keyword used to declare constants, prevent method overriding, and restrict inheritance.

• Final variables cannot be reassigned once initialized. Example: final int x = 10;

• Final methods cannot be overridden by subclasses. Example: final void display() {}

• Final classes cannot be subclassed. Example: final class Constants {}

The 4 pillars of data structure are arrays, linked lists, stacks, and queues.

• Arrays: Data structure that stores a collection of elements with a fixed size.

• Linked Lists: Data structure where each element points to the next element in the sequence.

• Stacks: Data structure that follows the Last In First Out (LIFO) principle.

• Queues: Data structure that follows the First In First Out (FIFO) principle.

SDLC stands for Software Development Life Cycle, which consists of different phases from planning to maintenance.

• 1. Planning phase involves defining project scope, requirements, and creating a project plan.

• 2. Analysis phase focuses on gathering and analyzing requirements to create a detailed system design.

• 3. Design phase involves creating a high-level design, detailed design, and architecture for the software.

• 4. I...read more

Callable is used to return a result and can throw checked exceptions, while Runnable is used for void operations.

• Callable can return a result and throw checked exceptions, while Runnable cannot.

• Callable is a functional interface with a method call() that returns a result, while Runnable is a functional interface with a method run() that does not return a result.

• Example: Callable<Integer> task = () -> { retur...read more