JAVA

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JAVA

JAVA was developed by Sun Microsystems Inc in 1991, later acquired by Oracle Corporation. It was developed by James Gosling and Patrick Naughton. It is a simple programming language. Writing, compiling and debugging a program is easy in java.

Java is distributed and Multithreading

Also allows the use of multiple threads to get the most out of the cpu.

Java allows the creation of distributed applications between systems connected to each other through internet connection

Secure

The java buffer cannot be accessed so it is impossible to corrupt it.

Simple and Robust

It is an easy to read and write language, the way it was developed allows:

Memory allocation

Exception handling

Garbage collection

Early error detection

Programming Paradigm

Java is a language designed to use the object-oriented programming paradigm.

Object oriented programming is a way of organizing programs as collection of objects, each of which represents an instance of a class. 4 main concepts of Object Oriented programming are:

Inheritance

Apoya el concepto de clasificación jerárquica.

La herencia es el mecanismo por el cual un objeto adquiere las propiedades algunas / todas de otro objeto.

Polymorphism

This can be implemented by designing a generic interface, which provides generic methods for a certain class of action and there can be multiple classes, which provides the implementation of these generic methods.

In other words it means, one method with multiple implementation, for a certain class of action. And which implementation to be used is decided at runtime depending upon the situation (i.e., data type of the object)

Polymorphism means to process objects differently based on their data type.

Encapsulation

Encapsulation is: - Binding the data with the code that manipulates it. - It keeps the data and the code safe from external interference.

Everyone knows how to access it.

The idea of encapsulation is to keep classes separated and prevent them from having tightly coupled with each other.

There shouldn’t any side effects of the code, to the rest of the application.

Can be easily used regardless of implementation details.

Abstraction

Abstraction is a process where you show only “relevant” data and “hide” unnecessary details of an object from the user.

Java Terminology

Java Development Kit (JDK)

is a development toolkit that allows you to create, compile and run java programs.

Java Virtual Machine (JVM)

This java virtual machine allows to run the same code on different operating systems

ByteCode

The java compiler compiles the source code to bytecode.