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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
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
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Vikas Rajput
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.
ACCESS MODIFIERS
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
CATAGORY JEE
Vikas Rajput
Vikas Rajput
@vikasrajputin
Java: Beginner Guide to Multithreading

a thread...

Multithreading is a concept of applying multitasking in Java.

Java supports thread-based multitasking.

Java program can be divided into several threads and those threads can be executed in parallel to support multi-tasking.

Two ways to create a thread in Java:

1. By Implementing Runnable Interface
2. By extending the Thread class

Let's create a thread by implementing the "Runnable" interface:

Steps:
1. Implement Runnable Interface
2. Override the run() method, and put your code inside it.
3. Pass the instance of your class to the Thread class constructor.
4. Call the start() method to run your thread.


Let's create a thread by extending the "Thread" class:

Steps:
1. Extend your class with Thread class
2. Override the run() method, and put your code inside it.
3. Instantiate your class.
4. Call the start() method to run your thread.
MULTITHREADING

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MINUTE DETAILS ABOUT THE ATTACK ON SHAISTA KHAN AT LAL MAHAL

Remarkable Commando op

A long 🧵 but worth your time

Aurangzeb sent his maternal uncle Shaista Khan with powerful army over 1,50,000 on the request of Badibegum Sahiba, Adilshahi sultanate

1/


Shaista Khan entered Deccan to kill Chhatrapati Shivaji Maharaj & to destroy his empire. Shahista Khan captured a lot of province and fort of Chakan near Pune.

2/


Till 3 years he gave lot of troubles to the subjects of Chhatrapati Shivaji Maharaj and he personally made Lal Mahal his destination to live at , which was the property of Chhatrapati Shivaji Maharaj . Lal Mahal, where Chhatrapati Shivaji Maharaj spent his childhood.

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1. In the April 1663 Chhatrapati Shivaji Maharaj personally made a surprise attack on Shahista Khan in the Lal Mahal Pune.

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Will Buxton
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The Haas / Force India argument is fascinating, and the decision of the stewards may still have consequences. The first key finding is that the stewards ruled Racing Point Force India to be a valid constructor. That means that it builds its own cars.

Haas had argued that the cars had been designed by Force India, but as Haas knows only too well, "outsourcing" is legal. The stewards decided that "there is no regulatory support for the argument that Outsourcing of Listed Parts cannot come from a former or excluded team."

In determining this, the stewards also came to the following conclusion: "In relation to the submission by the Racing Point Force India F1 Team that it is not a new team, the Stewards decide that the Racing Point Force India F1 Team is indeed a new team."

This will have a big knock on effect for Haas in its continued arguments over the rights of RPFI as relates to its eligibility and rights under the complex payments structure. Haas has argued all along that RPFI should be treated as a new team and tread the same path that it did.

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👨‍💻 Last resume I sent to a startup one year ago, sharing with you to get ideas:

- Forget what you don't have, make your strength bold
- Pick one work experience and explain what you did in detail w/ bullet points
- Write it towards the role you apply
- Give social proof

/thread


"But I got no work experience..."

Make a open source lib, make a small side project for yourself, do freelance work, ask friends to work with them, no friends? Find friends on Github, and Twitter.

Bonus points:

- Show you care about the company: I used the company's brand font and gradient for in the resume for my name and "Thank You" note.
- Don't list 15 things and libraries you worked with, pick the most related ones to the role you're applying.
-🙅‍♂️"copy cover letter"

"I got no firends, no work"

One practical way is to reach out to conferences and offer to make their website for free. But make sure to do it good. You'll get:

- a project for portfolio
- new friends
- work experience
- learnt new stuff
- new thing for Twitter bio

If you don't even have the skills yet, why not try your chance for @LambdaSchool? No? @freeCodeCamp. Still not? Pick something from here and learn https://t.co/7NPS1zbLTi
You'll feel very overwhelmed, no escape, just acknowledge it and keep pushing.
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JUST IN: The U.S. National Climate Assessment is now public.

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Here are some of the main

This report is mandated by Congress and focused on the impacts of climate change in the U.S.

Basically: This is what our best scientists think will happen to us as a result of the actions our government is (not) taking to address the most important problem in human history.
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300 experts in 13 federal agencies volunteered their time to make sure you have this information.

Please share it widely.
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The top finding:

“Climate change is projected to significantly affect human health, the economy, and the environment in the United

To expand on that finding:

“In the absence of more significant global mitigation efforts, climate change is projected to impose substantial damages on the U.S. economy, human health, and the environment. ...”
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Conditions :
1)EMA 8 above EMA 34 and rising
2)Candle close above previous 5 candle high
3) RSI above 60
4) Volume above previous 5 candles
5) ADX above 30
1/n

Select Double Moving Average 8 and 34
2/n


Under Patterns select Close Above Prev Bars
3/n


Qualify the candle close
4/n


RSI above 60
5/n
SCREENERS , SCREENER , A SCANNER