LTIMindtree Java Developer Interview Questions and Answers for Experienced

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

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

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

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

To make a class immutable in Java, we need to follow certain guidelines.

• Make the class final

• Make all fields private and final

• Do not provide setter methods

• If the field is mutable, return a clone of it instead of the original object

• Ensure that any mutable objects passed to the constructor are not modified outside the class

Autoboxing is the automatic conversion of primitive data types to their corresponding object wrapper classes.

• Autoboxing is useful when working with collections that require objects instead of primitives.

• Example: int i = 5; Integer j = i; //autoboxing

• Unboxing is the opposite of autoboxing, where an object of a wrapper class is converted back to its corresponding primitive type.

• Example: Integer j = 5; int i = j; //u...read more