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Vikas Rajput
@vikasrajputin 3 years, 9 months ago 511 views

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These 5 youtube channels will teach you programming more than a CS degree

🧵👇

1. FreeCodeCamp

https://t.co/RQae8ZU2wx

2. Programming with Mosh

https://t.co/NkaUHP5Waa

3. Derek Banas

https://t.co/yIe2G1wskd

4. Traversy Media

https://t.co/LQgK4nze2g

5. Durga Software Solution

https://t.co/UPfq95gHfi

6. Netninja

https://t.co/I4hk8kbFcI

7. Academind

https://t.co/GYh8fkO5EH

Before you go, do you know?
I've also started writing on LinkedIn.

I share some exclusive content there, which I never share here.

Follow me on Linkedin to stay updated with Backend content:
https://t.co/XgytLk3FWg

Namaste, I'm Vikas!

Every Mon, Wed & Friday - I tweet a thread on Backend Development.

Follow me @vikasrajputin to read all my future threads.

Like and RT the first tweet below to support my work. https://t.co/u6vE7NnsBp

These 5 youtube channels will teach you programming more than a CS degree

\U0001f9f5\U0001f447
— Vikas Rajput (@vikasrajputin) September 26, 2022

***7 youtube channels

Note:

- This thread is written from a programming perspective only

- Most CS degrees don't make you an employable programmer

- To become that, you should refer to these channels

- I've nothing against CS and don't want anyone to quit their degree after reading this thread.

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Vikas Rajput
@vikasrajputin

Five Different Ways to Create Objects in Java

a thread...

1. Using a new keyword.

It's the most popular one. We create an object by using a new operator followed by a constructor call.

Eg:

2. Using the newInstance() method of class "Class":

Eg:

3️. Using the newInstance() method in class "Constructor":

Eg:

Note:

Both the above ways (Shown in 2 and 3),
are known as reflective ways of creating objects.

Fun-fact:

Class's newInstance() method internally uses Constructor's newInstance() method.

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Vikas Rajput
@vikasrajputin

OOPs Concept in Java

a thread...

OOP Concepts are very common in Software Engineering.

All the OOP languages like Java, Python, C++, .Net, etc. have this concept.

In this thread, we'll try to understand it from Java's standpoint.

There are six different concepts in OOP:

1. Object
2. Class
3. Inheritance
4. Encapsulation
5. Abstraction
6. Polymorphism

Let's understand them one by one...

Object:

Look around you, whatever you see can be considered an Object.

For eg: The chair you are sitting on, the table, your computer, your house, windows, your pet, you yourself!

An object has Behaviour (things it does or performs) and Attributes (things that describe it).

Example:

Note: B = Behavior, A = Attribute

Chair:
B - Moves, Adjust Height, Recline, etc.
A - Built Material, Color, Make & Model, Brand, Price, etc.

You:
B - Eat, Play, Watch Netflix, Sleep, etc.
A - Height, Weight, Age, DOB, Name, SSN, etc.

Vikas Rajput
@vikasrajputin

Java: Why do we use getter and setter methods?

a thread...

In Java classes, we normally create the getter and setter methods to read and update class level fields respectively.

Let's find out why do we following this practice.

Consider a class "Account", having fields like accountName and accountBalance - to show the name and balance of the account.

As a common practice, both the variables are private and define the public getter and setter method to read and write their values.

Eg:

Using the above example, let's see different use-cases where having getter and setter methods can be game-changing.

1. Validation:

The public getter and setter method act as a single door to access the private fields.

Before updating the value we can run any validation in the setter method and accordingly allow field modification.

Eg:

Vikas Rajput
@vikasrajputin

Java: Acess Modifiers

a thread...

(Cheatsheet Included)

What is an access modifier?

Access Modifiers are a way of providing limited visibility to methods, variables, classes.

Different access modifiers provide different visibility due to which our program because less prone to unwanted changes.

Java has four access modifiers, let's see each one by one

public:
It's the least restrictive access modifier when any class, method, or variable is defined as public then it is accessible from anywhere.

protected:
Protected methods & variables can be accessed within the same package and also accessible to all child classes.

default:
When no access modifier is specified then java treats it as default. With default methods & variables are accessible within the same package.

private:
It's the most restrictive access modifier, when given to any methods & variable it is only accessible within the same class.

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