#5 Variables in Java

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In this lecture we will learn:
- Working of Java code
- How is data stored in a database?
- What are variables?
- Syntax of variables

#1
-As a Java developer you write a Java code that will be having .java extension and that gets compiled by javac.
- When you compile that code what you get in output is a byte code that has .class file.
- Whenever you run .class file in the JVM, it means that it's a part of JRE that has JVM as well as libraries and a lot of classes, and JRE is installed on the OS.
- So, you need a hardware or machine having OS and then OS will have JRE and it has JVM. As a developer, one more tool is required known as JDK.
When you will install the new JDK, you will get updated JRE and JVM with it.
- We are using JDK version 17 in this course because of its long-term support.
- We develop software to solve real-world problems using the virtual world.
e.g., Amazon

#2
- Whenever we build a project or an application what we are doing is we are processing the data.
- Data may come from the user and then we do processing on it. A database is used to store the data and processing done on it.
- Database is permanent or persistent storage which means data will remain there if the machine gets shut down.

#3 Variables:-
- Variable is used to store the data temporarily while processing.
- Variable is a type of box in which you store data and a type is attached to it such as type can be number, text, image, etc. Thus, a box is known as a variable and a name and value are present with it.
- A variable is a container that holds the value while the Java program is executed.
- Java is a strongly-typed language as it demands the declaration of every variable with a data type.

- Syntax of creating a variable:
datatype variable name = value;
int num1= 3;
- Here, (=) is the assignment operator that takes the right-hand side value and assigns it to the left-hand side.

- println is used to go or print on the new line.
- In Java, every statement ends with a semicolon except blocks.

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[sofiavillaverde]

Your content is better than most professors I’ve had in college! Great explanation and content!

[codenissi]

That is a fantastic explanation, happy I got this course and had understanding about java.

[kirankumarsb]

Great work sir,
It will helpful for infinity of students ✨.

[basudevpaul]

Enjoy your Content, Your content is great kudos 👏👏👏👏

[slejmww]

Your content is well explained here, I never understood Java until I have watched your videos.

thanks so much for this great explanation.

[theamritjha]

Thanku for this type of content sir ❤️🙏

[rajumallick]

00:03 Java development process and required tools.
01:39 Software is built to solve real-world problems using virtual solutions
03:13 Data can be stored temporarily in variables during processing.
04:33 Java variables are used to store data
06:03 Integers are used to store whole numbers, including negative values
07:27 Using 'print Ln' in Java to print on new lines
08:53 Create variables and assign values in Java
10:18 We can create variables to store and manipulate values.

[pinkprint]

I'm so glad I've found your videos! Super interesting! Thank you so much!

[simonason]

For anyone who have the issue "Error: Could not find or load main class Hello
Caused by:
I solved this by:
1 Save my project,
2 Type "javac Hello.java" in terminal "push" "enter",
3 Type "java "(classname)" in terminal "push" "enter"

This made it calculate for me. I have no coding experience or how you use the symbole language so I hope you can follow the steps.

[NaveenMaddela-yrgb]

U r a gem dude, u should be in IIT's.
Remembering all the stuff from college days.
U r better then many lectures & professors ( It's not mean they are not worthy, but u r next level in explanation)

It's very easy to understand and remember more stuff in simple way.

[rupeshkumar]

Sir whick jvm are you using to run java

[suraprashanthreddysura]

what is happening when we are not storing values in the variable, where the data is storing now? like S.O.P(2+3) do 2 require space and do 3 require space and the 5 require space if yes then where it is actually getting stored.

[andreasds]

Guys when I try it and use javac it makes and new byte bode instead of saving in the first file and when I want to run it error happens

[Ali-qylk]

"Could not find or load main class Hello" - Any fix for this?

[naseddinoufallah]

Hi, i want code ehere is code i can see that can you show me

[mohdfaizaanuddin]

= is a Assignment operator

Assignment operator takes value from Right Hand side and it will assign it to the left hand side.

Syntax of Declaring a Variable

Variabletype variablename = value

2) Every Statement must end with a Semi colon.

[manojKumar-siml]

println() is method right and we are sending operations as arguments to that method.

How println() taking those as arguments.

Ex: whether it taking as string, its taking as string you need to mention those in "" right.

[TheKenWiley]

I do not have JavaC show up when I type java -version. How do I get that installed in my system?
Everytime I try to run anything, like the basic sample above, I get "missing package" and/or "system" not resolved errors.
What is missing? Libraries not found? How do I correct this?

[shreyashlawate]

sir when I do changes in my code and compile it it shows the old result not the new why it is happening?? like when we added 3+5 and 8+7 it gives output only 8

[challacharan]

even though i changed the "Hello World" with (3 + 5) i could not get 8 instead again i am getting Hello World in terminal
(ANY SOLUTION FOR THIS PLEASE REPLY QUICK)