Web Development

What are the Differences between JavaScript and Java

Although the name JavaScript implies a close relationship with Java, JavaScript and Java are actually quite dissimilar. One significant distinction is the inclusion of object-oriented programming support.

While JavaScript is occasionally referred to as an object-oriented language, its object model is quite distinct from those of Java and C++.

The object-oriented software development paradigm is not supported by JavaScript. Strongly typed programming languages, such as Java, are what you’ll find. At compile time, all types and operand types are known, and compatibility is checked. There is no way to compile-time type check variables in JavaScript because they are not declared and are dynamically typed.

Other than the way they differ in data members and methods, the main difference between objects written in Java and JavaScript is that JavaScript objects have a dynamic collection of members and methods. An object created with JavaScript can have any number of data members and methods. For the most part, the syntax of Java’s statement expressions, assignment statements, and control clauses are identical to that of JavaScript.

Use of JavaScript

The original goal of JavaScript was to provide programming capability at both the server and the client ends of a Web connection. Since then, JavaScript has grown into a full-fledged programming language that can be used for a variety of application areas. This book focuses on client-side JavaScript.

Client-side JavaScript can serve as an alternative for some of what is done with server-side programming, in which computational capability resides on the server and is requested by the client.

Client-side JavaScript, on the other hand, is embedded in HTML documents (either physically or logically) and is interpreted by the browser. This transfer of load from the often-overloaded server to the normally underloaded client can obviously benefit all other clients.

Client-side JavaScript cannot replace all server-side computing. In particular, while server-side software supports file operations, database access, and networking, client-side JavaScript supports none of these.

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