10+ Alf Electric Vehicles Interview Questions and Answers

Encapsulation and polymorphism examples, class types, and requirements for good code.

• Encapsulation: hiding implementation details, e.g. private variables in a class

• Polymorphism: using a single interface to represent multiple types, e.g. method overloading

• Class types: abstract, final, static, inner, anonymous, etc.

• Requirements for good code: readability, maintainability, efficiency, scalability, etc.

TRUNCATE removes all records from a table, while DELETE removes specific records based on a condition.

• TRUNCATE is faster than DELETE as it does not log individual row deletions.

• TRUNCATE resets the auto-increment value of the table, while DELETE does not.

• TRUNCATE cannot be rolled back, while DELETE can be rolled back if used within a transaction.

• TRUNCATE does not trigger any delete triggers on the table, while DELETE does.

To reverse a string in Python, we can use slicing or the built-in reversed() function.

• Using slicing: string[::-1]

• Using reversed() function: ''.join(reversed(string))

• Both methods return the reversed string

The four pillars of Object-Oriented Programming are encapsulation, inheritance, polymorphism, and abstraction.

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

• Inheritance: Allowing a new class to inherit properties and behavior from an existing class.

• Polymorphism: The ability for objects of different classes to respond to the same message in different ways.

• Abstraction: Hiding the complex implementation details and showing only the n...read more

Java doesn't support multiple inheritance to avoid the diamond problem.

• Multiple inheritance can lead to the diamond problem where a class inherits from two classes with a common parent.

• This can cause ambiguity in method calls and lead to code complexity.

• Java supports multiple interface inheritance to achieve similar functionality.

• For example, a class can implement multiple interfaces to inherit their methods.

• This allows for code reuse without the complexity of multiple inheri...read more

Program to reverse a string without using inbuilt methods

• Create an empty string to store the reversed string

• Iterate through the original string from end to start and append each character to the new string

• Return the reversed string

An operating system is a software that manages computer hardware and software resources and provides common services for computer programs.

• An OS acts as an interface between the user and the computer hardware.

• It manages memory, processes, and input/output devices.

• Examples of OS include Windows, macOS, Linux, and Android.

• View is a virtual table that displays data from one or more tables in a database.

• Tuples are rows in a table that contain data for each column.

Java strings are immutable to ensure security, thread safety, and performance optimization.

• Immutable strings prevent malicious code from modifying the string content.

• Immutable strings can be safely shared across multiple threads without synchronization issues.

• Immutable strings allow for efficient memory allocation and garbage collection.

• String pool in Java is possible because of immutability.

• Examples of immutable classes in Java include Integer, Float, and Boolean.

A compiler is a program that translates source code into machine code.

• Compilers are used to convert high-level programming languages into low-level machine code.

• They perform lexical analysis, syntax analysis, semantic analysis, and code generation.

• Examples of compilers include GCC, Clang, and Visual C++.

• Compilers can optimize code for performance and size.

• Class files are the compiled output of Java source code, containing bytecode that can be executed on the Java Virtual Mach...read more