- JAVA OVERVIEW
- History of Java
- Tools you will need for java
- Java Environment Setup
- Popular Java Editors
- Java Basic Syntax/First-Program
- Java Identifiers
- Java Modifiers
- Java Arrays
- Java Enums
- Java Keywords
- Comments in Java
- Java - Objects and Classes
- Objects in Java
- Classes in Java
- Constructors
- Creating an Object
- Accessing Instance Variables and Methods
- Source file declaration rules
- Java Package
- Simple Case Study
- Basic Data Types
- Primitive Data Types
- Reference Data Types
- Java Literals
- Variable Types
- Local variables
- Instance variables
- Class or static variables
- Java Access Modifiers
- What is OOPS
- Inheritance concept
- Encapsulation
- What is Polymorphism
- Method Overloading
- Method Overriding
- Abstraction in Java
- Abstract class
- Interface in Java
- Method overloading in Java:
- What is Annonymous object?
- Java 8
What are Java Identifiers?
All the java components require names and these names used for classes, variables and methods, so that these are called identifiers.
In java, there are several points to remember about identifiers.
All these identifiers should begin with a letter (A to Z or a to z ), currency character ($) or an underscore (_).
After the first character identifiers can have any combination of characters. A keyword cannot be used as an identifier. Most importantly identifiers are case sensitive.
Examples of legal Java identifiers :-
abc
$salary
_value
__1_value
Examples of illegal Java identifiers :-
123abc
-salary
