Infosys Interview Questions

Abstract classes can have both abstract and concrete methods, and can maintain state (instance variables). Interfaces (prior to Java 8) could only have abstract methods and constants. A class can extend only one abstract class but can implement multiple interfaces.

1. Encapsulation: Wrapping data and methods into a single unit (class).
2. Abstraction: Hiding implementation details and showing only functionality.
3. Inheritance: Acquiring properties of one class into another.
4. Polymorphism: Ability to take multiple forms (overloading/overriding).

Primary Key: A unique identifier for a record in a table. It cannot be null.
Foreign Key: A field that links to the Primary Key of another table, establishing a relationship between the two tables.

void reverseString(char* str) {
    int n = strlen(str);
    for (int i = 0; i < n / 2; i++) {
        char temp = str[i];
        str[i] = str[n - i - 1];
        str[n - i - 1] = temp;
    }
}

The `final` keyword is used to restrict the user:
- Final Variable: Value cannot be changed (constant).
- Final Method: Cannot be overridden by subclasses.
- Final Class: Cannot be inherited.

A stored procedure is a prepared SQL code that you can save, so the code can be reused over and over again. It helps in reducing network traffic and improves performance.

Recursion is a process where a function calls itself directly or indirectly. It requires a base case to stop the infinite loop. Example: Factorial calculation, Fibonacci series.

C++ supports pointers, multiple inheritance, and is platform-dependent (compiled to machine code). Java does not support explicit pointers, supports only single inheritance (classes), and is platform-independent (compiled to bytecode runs on JVM).

Array: Fixed-size collection of elements stored in contiguous memory locations. Fast access (O(1)).
Linked List: Dynamic collection where elements (nodes) are stored in non-contiguous memory, linked by pointers. Efficient insertions/deletions.

SDLC (Software Development Life Cycle) is a process used by the software industry to design, develop and test high-quality software. Stages: Requirement Analysis, Design, Implementation (Coding), Testing, Deployment, Maintenance.

"Infosys is a global leader in consulting and digital services. I am impressed by its world-class training facility in Mysore and its focus on continuous learning. It provides a great platform for freshers to start their career."

"Yes, I can. During my college projects, we had tight deadlines which taught me how to prioritize tasks and manage time effectively. I believe pressure can sometimes be a good motivator to perform better."

"Short-term: To get placed in a reputed company like Infosys and learn the corporate work culture. Long-term: To become a subject matter expert in my domain and lead a team of developers."

Use the STAR method (Situation, Task, Action, Result). Example: "In my final year project, a team member fell ill... I took up extra responsibility... we successfully completed the project on time."

Always ask a question. "What technologies will I be working on?" "What does the typical career path look like for a fresher at Infosys?"