Core Java: Data Types,Printing,Comments, Wrapper, Package& Access Specifiers| Computer Science (2/4

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TOPICS TO BE DICUSSED
Identifiers, Variables and Constants
Data Types
Primitive
Non-Primitive
Printing Statement
Comments in Java
Wrapper class
JAVA Packages
Access Specifiers


Identifiers
An identifier is a name used for a variable, an interface, a function or a class. There are some set of rules in JAVA to use an identifier.
An identifier must start with an alphabet (uppercase/lowercase)or an underscore or ‘$’ dollar sign. After the first character, it can have numbers also.
It can not contain any white space.
Any reserved word can not be used and an identifier.
Identifiers are case sensitive that means ‘num1’ and ‘NUM1’ are different.
An identifier should be meaningful means always related to the value they are holding. Else they will be unhandled in complex programming.
Examples: $Income, Emp_Income, dob_as_1999 are some valid identifiers
variables vs constants
VARIABLE: A variable is a memory location which stores data temporarily. Temporarily means value hold by a variable can be change anytime before or during the program execution

CONSTANT: Constant is a variable whose value cannot be changed before or during the execution of the program. If you want to make a variable ‘constant’, add a specifier ‘final’ with the variable. Value of final variable can’t be changed.
CODE/Output – Constant Variable
CODE/OUTPUT- A VARIABLE
Data Types
Data types are used to specify the types of data holding by a variable. In JAVA, there are two types of data types.
Primitive Data Types
Non-Primitive Data Types

Primitive Data Type
Primitive data types are pre-defined in Java. That Means Pre-defined data type can hold data of particular length/size.
There are eight types of Primitive data types in JAVA.

Chapters:
0:00 Core Java
0:10 Topics
0:44 Identifiers
2:48 Variables VS Constants
3:32 Constant Variable
4:27 A Variable
5:00 Data Types
5:37 Primitive Data Types
5:52 Table of Data Type
6:14 Non-Primitive Data Types
6:32 String
6:37 Array
7:04 Printing Statement
7:43 Example of Printing Statement
8:04 Comments in Java
8:10 Multiline Comments
8:23 Single Line Comment
8:43 Wrapper Class
8:55 Table of Wrapper Class
9:03 Java Packages
10:21 Access Specifiers
10:36 Types of Access Specifiers
11:45 Questions
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