Reveision java

What is Java? _Java is a popular programming language, created in 1995. It is used for: Mobile applications (specially Android apps) Desktop applications Web applications Web servers and application servers Games Database connection And much, much more!_ ---------------------------------------------------------------------Why Use Java? _ Java works on different platforms (Windows, Mac, Linux, Raspberry Pi, etc.) It is one of the most popular programming languages in the world It has a large demand in the current job market It is easy to learn and simple to use It is open-source and free It is secure, fast and powerful It has huge community support (tens of millions of developers) Java is an object oriented language which gives a clear structure to programs and allows code to be reused, lowering development costs_ What is Variables ? _ String - stores text, such as "Hello". String values are surrounded by double quotes int - stores integers (whole numbers), without decimals, such as 123 or -123 float - stores floating point numbers, with decimals, such as 19.99 or -19.99 char - stores single characters, such as 'a' or 'B'. Char values are surrounded by single quotes boolean - stores values with two states: true or false_ What is data types? _1. A variable in Java must be a specified data type: Data Type Description byte Stores whole numbers from -128 to 127 short Stores whole numbers from -32,768 to 32,767 int Stores whole numbers from -2,147,483,648 to 2,147,483,647 long Stores whole numbers from -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807 float Stores fractional numbers. Sufficient for storing 6 to 7 decimal digits double Stores fractional numbers. Sufficient for storing 15 to 16 decimal digits boolean Stores true or false values char Stores a single character/letter or ASCII values _

Feb 22, 2025 - 05:34

What is Java?

_Java is a popular programming language, created in 1995.

It is used for:

Mobile applications (specially Android apps)
Desktop applications
Web applications
Web servers and application servers
Games
Database connection
And much, much more!_

---------------------------------------------------------------------Why Use Java?
_
Java works on different platforms (Windows, Mac, Linux, Raspberry Pi, etc.)
It is one of the most popular programming languages in the world
It has a large demand in the current job market
It is easy to learn and simple to use
It is open-source and free
It is secure, fast and powerful
It has huge community support (tens of millions of developers)

Java is an object oriented language which gives a clear structure to programs and allows code to be reused, lowering development costs_

What is Variables ?

_ String - stores text, such as "Hello". String values are surrounded by double quotes
int - stores
integers (whole numbers), without decimals, such as 123 or -123
float - stores floating point numbers, with decimals, such as 19.99 or -19.99
char - stores single characters, such as 'a' or 'B'. Char values are surrounded by single quotes

boolean - stores values with two states: true or false_

*What is data types?
*

_1. A variable in Java must be a specified data type:

Data Type Description
byte Stores whole numbers from -128 to 127
short Stores whole numbers from -32,768 to 32,767
int Stores whole numbers from -2,147,483,648 to 2,147,483,647
long Stores whole numbers from -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
float Stores fractional numbers. Sufficient for storing 6 to 7 decimal digits
double Stores fractional numbers. Sufficient for storing 15 to 16 decimal digits
boolean Stores true or false values
char Stores a single character/letter or ASCII values
_