All the key concepts of Java like(Theoretical and Programatically)
Language Fundamentals
A Java Program
If Statements
Switch Statements
Loop Statements
Syntax Details
Primitive Datatypes
Variables
Expressions in Java
Strings
Arrays
Objects and Classes
Defining a Class
Creating an Object
Instance Data and Class Data
Methods
Constructors
Access Modifiers
Encapsulation
Exception Handling
Exceptions Overview
Catching Exceptions
The finally Block
Exception Methods
Declaring Exceptions
Defining and Throwing Exceptions
Errors and Runtime Exceptions
Inheritance in Java
Inheritance
Inheritance in Java
Casting
Method Overriding
Polymorphism
super
The Object Class
etc.
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