Java variable & interface types | functional and marker interface | Local and instance variable

We will discuss Types of variables and Types of interfaces in Java.
We will discuss class variables, instance variables, local variables.
We will discuss functional interface, normal interface and marker interface.

Introduction to Java, It is a programming language and platform, it is a high-level language and also object-oriented,
It was developed by James Gosling from sun microsystems in 1995

Platform: Any software or hardware environment in which the program runs. It does not require anything from the operating system it is also an individual platform
High-level: any language whose wordings are near to natural language, which means easy to understand.
Object Oriented: object-oriented is something like a collection of rules and regulations that can be followed by any programming language like Python Java,C# we use oop concepts for the reusability of code. In oop, we can not access or fetch data unless making the object.

Why java?
Because it has been tested refined extended and proven by a dedicated community of java developers architects and enthusiasts
Because
Simple Grammer
Portability
Garbage collection
Speed
Huge library
Why java was created?
Java was created with five main goals
• It should be object-oriented
• A single representation of program code be executed on multiple operating systems (Write once run anywhere)
• It should fully support network programming
• It should be easy to use.

Java is divided in to three categories
J2SE (Java 2 Standard Edition ) //Desktop based applications
J2EE ( Java 2 Enterprise Edition) //Web-based applications
J2ME (Java 2 Micro or Mobile Edition) // Android applications

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types of variables in java with examples
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example of interface in java
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local variable
class variable
parameter variable
instance variable
marker interface
functional interface
normal interface
interface

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