Intellect Interview Questions and Answers

Collection framework is a unified architecture for representing and manipulating collections of objects in Java.

• Provides interfaces (List, Set, Map) and classes (ArrayList, HashSet, HashMap) for storing and manipulating groups of objects

• Includes algorithms for searching, sorting, and manipulating collections

• Allows for easy iteration over collections using iterators or enhanced for loops

OOPS concepts are the four main principles of Object-Oriented Programming: Inheritance, Encapsulation, Abstraction, and Polymorphism.

• Inheritance: Allows a class to inherit properties and behavior from another class.

• Encapsulation: Bundling data and methods that operate on the data into a single unit.

• Abstraction: Hiding the complex implementation details and showing only the necessary features of an object.

• Polymorphism: Ability of an object to take on many forms.

A functional interface is an interface that contains only one abstract method.

• Functional interfaces can have multiple default or static methods, but only one abstract method.

• Functional interfaces are used in lambda expressions and method references.

• Examples of functional interfaces in Java include Runnable, Callable, and Comparator.

Java is a high-level programming language known for its portability, security, and object-oriented features.

• Java is platform-independent, meaning it can run on any device with a Java Virtual Machine (JVM).

• It is known for its strong security features, such as automatic memory management and built-in exception handling.

• Java is an object-oriented language, allowing for modular and reusable code through classes and objects.

• Popular frameworks and libraries in Java include Spring, ...read more

Streams are sequences of data that allow for efficient processing of large amounts of data in a continuous manner.

• Streams are used for processing data in a continuous and efficient manner.

• They allow for reading and writing data in chunks rather than all at once.

• Examples include reading a file line by line, processing a live video feed, or receiving real-time data from a network connection.

Java 8 introduced several new features including lambda expressions, streams, and the new Date and Time API.

• Lambda expressions allow for more concise code and easier parallel programming.

• Streams provide a way to process collections of objects in a functional style.

• The new Date and Time API offers improved date and time handling compared to the old Date and Calendar classes.

The #include directive is used to include a file in the source code.

• It allows the programmer to use code from other files in their program.

• The included file is processed by the preprocessor before compilation.

• The syntax is #include or #include "filename".

• Examples of included files are header files like or user-defined header files.

A Left Join is a type of join operation in relational databases that returns all rows from the left table and the matched rows from the right table.

• Returns all rows from the left table, even if there are no matches in the right table

• If there are no matches, NULL values are used for the columns from the right table

• Useful for retrieving data from one table while including any matching data from another table