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Abstraction is the concept of hiding complex details and showing only the essential features of an object or system.
Abstraction allows us to focus on what an object does instead of how it does it
It helps in reducing complexity and improving efficiency
For example, a car is an abstraction of various components like engine, wheels, etc. We don't need to know the internal workings to drive it
Inheritance is a concept in object-oriented programming where a class inherits attributes and methods from another class.
Allows a class to inherit properties and behaviors from another class
Promotes code reusability and reduces redundancy
Creates a parent-child relationship between classes
Example: Class 'Car' can inherit from class 'Vehicle' to reuse common attributes like 'color' and 'speed'
Android states lifecycle includes onCreate, onStart, onResume, onPause, onStop, onDestroy.
onCreate - Activity is created
onStart - Activity is visible
onResume - Activity is interacting with user
onPause - Activity is partially visible
onStop - Activity is not visible
onDestroy - Activity is being destroyed
Polymorphism is the ability of a single function or method to operate on different types of data.
Polymorphism allows objects of different classes to be treated as objects of a common superclass.
There are two types of polymorphism: compile-time (method overloading) and runtime (method overriding).
Example of compile-time polymorphism: function overloading in Java.
Example of runtime polymorphism: method overriding in Java
Details about the last prject done
I applied via Naukri.com and was interviewed in Nov 2022. There were 2 interview rounds.
I applied via Company Website and was interviewed in Feb 2023. There were 2 interview rounds.
Deftsoft interview questions for popular designations
I applied via Walk-in and was interviewed before Sep 2020. There were 4 interview rounds.
I appeared for an interview before Jul 2020.
Yes, Infosys is listed on the Indian stock exchanges as well as on the NYSE.
Infosys is listed on the Bombay Stock Exchange (BSE) and National Stock Exchange of India (NSE)
It is also listed on the New York Stock Exchange (NYSE)
Infosys has a market capitalization of over $80 billion as of 2021
I applied via Company Website and was interviewed before Feb 2020. There was 1 interview round.
I applied via Naukri.com and was interviewed before May 2020. There were 3 interview rounds.
I applied via Campus Placement and was interviewed before Sep 2019. There were 5 interview rounds.
OOPs concepts in Java are the fundamental principles of object-oriented programming.
Encapsulation: wrapping data and code into a single unit
Inheritance: creating new classes from existing ones
Polymorphism: using a single interface to represent multiple types
Abstraction: hiding implementation details from the user
Examples: class, object, inheritance, polymorphism, encapsulation
Stack is a LIFO data structure while Queue is a FIFO data structure.
Stack follows Last In First Out (LIFO) principle while Queue follows First In First Out (FIFO) principle.
Stack has two main operations: push and pop while Queue has two main operations: enqueue and dequeue.
Stack is used in recursive function calls, undo/redo operations, and backtracking while Queue is used in breadth-first search, printing tasks in ord...
SQL query to find second highest salary in database
Use ORDER BY and LIMIT to get the second highest salary
Assume ties are allowed and use DISTINCT
Method overloading is having multiple methods with the same name but different parameters. Method overriding is having a method in a subclass with the same name and parameters as a method in its superclass.
Method overloading is done within the same class while method overriding is done in different classes (subclass and superclass).
Method overloading is achieved by changing the number of parameters or the data type of ...
The parent class of all classes in Java is the Object class.
All classes in Java implicitly extend the Object class.
The Object class provides basic methods such as toString(), equals(), and hashCode().
Any class can override these methods to provide custom implementations.
Example: public class MyClass extends Object { ... }
Example: Object obj = new MyClass();
SQL databases are relational and use structured query language, while NoSQL databases are non-relational and use various data models.
SQL databases are based on a fixed schema, while NoSQL databases are schema-less.
SQL databases use tables to store data, while NoSQL databases use various data models like key-value, document, columnar, or graph.
SQL databases are better suited for complex queries and structured data, whil...
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