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Learn Core Java, in 30 days as an Absolute Beginner

a roadmap...

 Core Java can be Overwhelming, in the beginning!

Let's see what are those topics you should cover and what you can skip in Core Java.
1. Theoretical Concepts (2 days)

- Features of Java
- JVM, JRE & JDK
- Memory areas in Java
- Basics of how Garbage Collection Works.
2. OOP Concepts (3 days)

- Objects and Classes
- Inheritance
- Polymorphism
- Encapsulation

This topic forms the basis of your Java learning. Spent enough time on this topic and understanding it using real-world examples and some practicals.
https://t.co/VFImq1o2uW
3. Primitives data types, Operators & Arrays (3 days)

- Various primitives/non-primitives data types, operators
- What is their use, How to use them
- Various sizes of data types
- Arrays, practice a few of its problems
- 2D/3D arrays and their use cases, practice a few problems
4. Packages and Access Modifiers (2 days)

- Default package, Normal package and its use case
- Various access modifiers and how they behave in different types of packages.
- Write a few programs to practice

https://t.co/kCrMArRhmC
5. Conditional Statements and Loops (2 days)

- While/Do While
- For loops
- If/else conditions
- Switch case
6. Objects, Classes & Interface (4 days)

- Objects
- Abstract Class/Concrete Class
- Constructors, Methods
- Interface
- What is Inheritance through classes and interfaces
- Method Overloading/Overriding
- static, final keywords
7. Basics of Multithreading (2 days)

- What is threads, How do create them.
- Thread class, hierarchy
- Learn to create simple threads using Thread class and using Runnable.
- Various methods of Thread class
- Write some program to practice

https://t.co/C7JfpMCgdV
8. Exception Handling (3 days)

- Problem solved by Exception Handling
- Exception Hierarchy
- Checked/Unchecked Exception
- How to create custom exception
- throw, throws, throwable, try-catch, finally
9. Collections (5 days)

- Basics of Collections
- Classes/Interface with its hierarchy in Collection framework.
- All about List, Set & Map, their differences, internal data structures and internal working.
- Collections util class
10. Lambda & Streams (3 days)

- What are lambda functions & why is it introduced
- Functional Interface and Functional Programming
- Write programs to practice
- Streams API and its methods.
- Stream pipelines and their methods

https://t.co/XqJlbBdpb6
Tips:

1. Skip these Topics:
- Advance Multithreading Concepts
- Swing/Applet
- Java. util package
- Java. io package

2. Prepare a daily plan, and spent 5-8 hrs daily to achieve this goal.

3. Don't fall into tutorial hell, write programs at every stage.
Conclusion:

Don't hardwire that these are the only topics you should know in Core Java, the rest is garbage.

No. That's not true!

But as an absolute beginner, you should at least know this much while the rest of the topics you will discover as and when you need.

More from Vikas Rajput

Vikas Rajput
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:
GETTERSANDSETTERS
Vikas Rajput
Vikas Rajput
@vikasrajputin
Java: Beginner Guide to Stream API

a thread...

Streams are a way to perform operations on the whole collection of data.

Stream never modifies the source data, it processes it and gives us the result without modifying the original data.

Let's see few popular ways to create stream:

1. Collection. stream()
2. Stream.of(T... values)
3. Arrays. stream()
4. Stream.builder()

Eg:️


Consider stream as a pipeline, where we perform mainly two different operations on the source data:

1. Intermediate Operations(IO)
2. Terminal Operations(TO)

Here's what the stream pipeline looks like:

Source -> Intermediate Operations -> Terminal Operations

Intermediate Operations(IO):

It returns another stream object, after this, we can either call another IO or TO.

Few methods in Stream API for Intermediate operations:
1. filter()
2. map()
3. sorted()

and many more...
STREAMAPI
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Vikas Rajput
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.
OOPS
Vikas Rajput
Vikas Rajput
@vikasrajputin
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
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Vikas Rajput
Vikas Rajput
@vikasrajputin
Ultimate Backend Development Roadmap in 2022:

📂Basics
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📂Any Language & Framework
📄Java + Spring
📄Python + Django
📄JS + Node
📂Git
📂SQL/NoSQL
📂Basic DevOps
📄CI/CD, Cloud Hosting (AWS, etc)
📄Docker, Kubernetes
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WEAPONS OF MAHADEV

Sarvaripati Shiva is one of the most fearsome manifestations of Mahadev. Assigned with destroying all of the universes at the end of time, Shiva is one of the most fearsome warriors. He is the Mrityunjaya.
Here are some weapons associated with him:


TRISHULA: the 3 pointed blades denote creation, maintenance, and destruction or the 3 Kalas – Past, Present and Future. They also represent 3 Gunas – Sattva, Rajas and Tamas).
Shiva’s trishul can only be stopped by Shiva himself.
@onlyonenetra @DetheEsha


Trishul is also said to represent Ida, Pingala, and Sushumna. These are the three basic nadis – the left, the right and the central – in the pranamaya kosha, or the energy body of the human system.
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PARASHU: axe with 4 cutting edges which Shiva gave to Parashurama. In his anger, Parashurama used the parashu to get rid of the all the Earth’s tyrannical kshatriya caste twenty-one times over.
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CHANDRAHASA SWORD: The divine sword Chandrahasa literally means ‘the laughter of the moon’. Ravana gave this sword to Indrajit on different occasions especially to fight against Devas.
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MAHARAJA CHHATRASAL BUNDELA was the great Bundela King who revolted against the Mughal ruler Aurangzeb.
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His ancesters were the vassals of Mughal Emperor. He drew inspiration from his father and revolted against the alien rule of Mughals. He was just 12 yrs old when his parents died in fight against the Mughal Army of Aurangzeb in 1661.

When his beloved father attained martyrdom in the year 166, the young Chatrasal was present in the last battle of his father against the Mughal and from these valiant campaigns,..

..he gathered the courage to free Bundelkhand from Aurangzeb’s rule.
He joined the Mughals initially, and was recommended by the Rajput King Mirza Jai Singh to be recruited in the Mughal Army in order to support their Deccan Campaigns.


But serving the alien rule of Mughals which brought chaos and misery to Bundelkhand was unacceptable for Chatrasal Bundela and his father’s incessant struggle against the Mughals kept the fire of independent Bundelkhand alive in his heart.
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1. @Pathik_Trader
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5. @Rishikesh_ADX

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1. Open

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