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<Java>

introduction to Java

Java is a high-level, platform-independent programming language.

General-purpose, concurrent, object-oriented, class-based programming language.

Used for creating video game development, big data, AI, and more...

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//How it was born?

The Oak language was born in 1992, produced by Sun Microsystems and later called Java.Java was created to facilitate old-style programmers, linked in particular to languages ​​such as C++.The basic syntax has been kept almost identical to that of C++; But no features considered to be a source of unnecessary complexity have been introduced.

//The creator of java

James Gosling

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<01> Main features

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Robust and secure:Automatically manages memory.Offers a high level of security.Portability:Java code is "write once, run anywhere" (WORA).Works on different operating systems. Extensive standard library:Provides APIs for various functionalities.Simplifies application development. Versatile:Suitable for different types of applications.Used in various sectors, from web to mobile.

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<02> SYNTAX AND DATA

How is a code structured?

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Syntax declarations Declarations give the type to a variable and declare them within the program. variable types can be: int, boolean, string, float, char. The declaration consists of putting the type of variable you want to use and the name (any).String name;int year;boolean true;

Syntax Comments/* comment */ //comment

Syntax expressions A Java program is first and foremost composed of expressions like: • Constants; • Operators; • Variables.

Syntax method A method, when declared, is similar to a mathematical function: it has parameters and returns a value.int sum (int x, int y) { return x+y; }

Command syntax The commands can be: • Simple: a+1; • Compounds:if (a>1)b=b+1;

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Data types

Primitives: • They are fixed • An "instance" of primitive type is generated by a constant • You act on them with the operators • A variable "contains" a primitive type

Objects: • They are unlimited in number • An object "instance" is generated by a constructor • You act on them with methods • A variable "refers" to an object: it is a pointer

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<03> context

A Versatile and Widely Used Programming Language

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// Web application development

Java is an excellent choice for creating robust and scalable web application

// Desktop application development

Java is a great choice for creating desktop applications with graphical user interfaces (GUIs).

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// Mobile application development

Java has been used to develop native mobile applications for Android.

// Video game development

Java is used to create video games for PC, mobile devices, and consoles.

<java> examples

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// android applications

// minecraft

// Google Chrome

//netflix

// amazon services

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<04> Java and C++: same family

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//java and c++

• Java and C++ are both high-level;
• They are used to develop high-performance software;
• Different approaches to RAM memory;
• Both are widely used in the software industry and are supported by large developer communities.

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//what do they have in common?

• Similar syntax: Both languages ​​use a C-like syntax, with some specific differences.
• Compilation: Both languages ​​are compiled into machine code before execution.
• Memory Management: Both languages ​​offer precise control over memory management.

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