The Difference Between the Java & Javascript

Introduction

With the release of the Java 8, it’s time to revisit the differences between Java and JavaScript. In this post, we’ll take a look at the syntax, semantics, and differences in the way these two languages handle types.

Java is a statically typed language, meaning that variables must be declared with a specific type before they can be used. JavaScript is a dynamically typed language, meaning that variables can be used without being declared with a type.

Java is a class-based language, meaning that code is organized into classes and objects. JavaScript is a prototype-based language, meaning that code is organized into prototypes.

Java is a compiled language, meaning that code is converted into machine code that can be executed by a computer. JavaScript is an interpreted language, meaning that code is executed by a JavaScript engine.

Java is an object-oriented language, meaning that code is organized into objects. JavaScript is a multi-paradigm language, meaning that it supports object-oriented, functional, and imperative programming paradigms.

Syntax

Java uses a traditional block-style syntax, meaning that code is organized into blocks delimited by curly braces. JavaScript uses a C-style syntax, meaning that code is organized into functions.

JavaScript has a more permissive syntax than Java.JavaScript allows undeclared variables, whereas Java requires all variables to be declared before they can be used.

JavaScript also allows functions to be defined inside of other functions, whereas Java requires all functions to be declared at the top level.

Types

Java is a statically typed language, meaning that all variables must be declared with a type before they can be used.

Java has a rich type system that includes primitive types, reference types, and array types.

Java also supports type inference, meaning that the type of a variable can be inferred from the type of the expression that is assigned to the variable.

JavaScript is a dynamically typed language, meaning that variables can be used without being declared with a type.

JavaScript has a limited type system that includes primitive types, reference types, and object types.

JavaScript does not support type inference, meaning that the type of a variable must be explicitly declared.

Differences

One of the most significant differences between Java and JavaScript is that Java is a statically typed language and JavaScript is a dynamically typed language.

Another significant difference is that Java is a class-based language and JavaScript is a prototype-based language.

Java is a compiled language and JavaScript is an interpreted language.

Finally, Java is an object-oriented language and JavaScript is a multi-paradigm language.