#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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