Have you heard of Java and JavaScriptWould you say they are the same, or that they could be? This discussion even takes place in meetings of people who are knowledgeable about the world of computing and programming, even those who are new to the subject.
Rather One might ask what Java and JavaScript have in common, since, beyond being languages and being called "Java", they have nothing else in common..
Still, Let's see what each of them is., with its main characteristics yCourse a comparison to understand their differences.
What is Java and what are its features?
Java is a programming language general purpose originally intended for design applications for TV receivers and embedded devices, although we now find it behind everything. Its purpose is, therefore, generally concurrent.
It was also intended that each program would be written only once and then could be run anywherewithout having to recompile the code over and over again. It is currently among the most popular programming languages, being used extensively, especially when... develop client-server software.
It has a syntax largely derived from C and C++with few low-level units. The result of its use is a application that, compiled to bytecode, will run on any Java virtual machineregardless of the team's architecture.
What is JavaScript and what is it used for?
JavaScript is another programming language, in this case, interpreted and specificIt is born later and does so with the intention of to enable greater interactivity on websiteswhich, until now, were too flat and unattractive to the user.
Commonly It is used on the client sideIt is primarily implemented in web browsers (all currently support it) to improve the user interface and websites. There is also a server-side version. Its use is so widespread that it is undoubtedly the benchmark for this objective, being used to add interactivity on virtually all sites.
Also It integrates into various applications. like other programming languages, operating systems, or servers. Its syntax is quite similar to that of C, modifying names and conventions and adopting them from others as well, including Java.
Are Java and JavaScript the same thing? What are the differences?
As we already mentioned at the beginning, no, Java and JavaScript are not the sameBoth are languages, and the second "borrowed" its name from the first to capitalize on its fame, but nothing more. The truth is, they differ in many ways:
- Language type:
- JavaScript is interpretedThis means that programs developed in this language form text files that your computer and you yourself can read, integrating into the HTML pages and being interpreted by the browser.
- java is compiledThat is, the information comes together to create a special file that a computer can read and execute.
- Necessary resources:
- JavaScript only requires one text editor for the code and of a navigator where the results will be displayed.
- Java needs a virtual machine and a development kit, which consists of the tools that allow us to create programs and among which stand out "javac.exe", which is the compiler, "java.exe", the interpreter, and "javadoc.exe", which is the one that generates the class documentation.
- Depuration phases:
- JavaScript has a single-stage purification. For this reason, Errors are only detected during execution of the program (unless you use specific tools for it).
- Java does the same in two times. This means that In the first compilation phase, we will be able to detect errors without needing to run the software. If we have resolved these issues, any runtime errors that may appear will be logical in nature.
- Type of objects:
- JavaScript It is based on prototypesThus, in most cases it is necessary for it to simulate several of the characteristics of certain programming languages. The positive point is that its paradigms, of various kinds (dynamic, imperative, functional, and object-oriented) make it a highly versatile tool. The objects, being generalized, are duplicated and extended, sharing properties and methods.
- JavaScript has a imperative paradigm purely object-orientedThe defined classes will invoke objects.
- Typing or conversion of data from one type to another:
- JavaScript is weak in this aspect. Variables are capable of having data that changes type over and over againIt is flexible but encourages error.
- Java is very powerful. Each variable has a predetermined type; Once defined, they cannot be modified..
- Ambit:
- Java has a scope per blockEach variable leaves its block until it is defined, ceasing to be a class or instance variable. Defined variables cannot be modified.
- The one for JavaScript is by functionThe variable will be accessed within the declared function.
- Object encapsulation: This is a way of enclosing the elements (methods or attributes) of an object so that they can only be consulted when they are called, allowing you to decide which ones you have access to, or not.
- JavaScript does not include it.
- Yes, Java is highly effective.
- Namespace presence: It's an address that tells you where each class is.
- JavaScript it does not have namespaces.
- Java Use this method of work.
- Multithreading:
- Feature unsupported because of JavaScript and there is no provision either.
- Multithreading allows us to perform the running several programs simultaneously in Java.
- Support:
- JavaScript is exclusive to your usage and implementation in desktop applications and browsers.
- Java works both in browsers and in virtual machines of all kinds.
- Closures: They are a creation resulting from the declaration of a function within a variable.
- JavaScript It has always operated with closureswhich are one of its most characteristic aspects.
- Java has incorporated them very recently, in its version 8 at an unparalleled level.
- Multi-argument:
- JavaScript has the multi-argument as intrinsic feature of all its functions.
- In Java It is necessary to point this out to configure the functions with that feature.
- Standardization:
- JavaScript is a standard language by ECMA-262.
- Java is not, It belongs to a private company. which he will modify at will whenever he wishes.
- Disk writing:
- JavaScript He can't do itThis makes the user feel more secure, to the point of being considered a secure language for use on the network.
- Java is capable of perform file management.
- Other features:
- JavaScript is less complex, which of course makes it lighter, faster, and simpler.
- Java is more robust, capable, heavyweight, complex, and complete.
- Development: Although this point is absolutely unnecessary to understand what Java and JavaScript are and how they work, it should also be mentioned that they are not developed by the same corporation, not by a long shot.
- Java is a product of Sun Microsystems released in 1991.
- JavaScript was developed by Netscape in 1995.
The conclusion we can draw from all of the above is that their only similarity is that both are languages designed for developing software components. Otherwise, They don't work the same way, nor do they work in the same way, nor do they have the same purpose..
