Do these 3 things before closing this tab:
1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsJava and JavaScript are separate programming languages, not two names for the same thing. JavaScript’s core language is standardized as ECMAScript; Java has its own language specification. Their names and some syntax resemble one another, but their semantics, environments and ecosystems differ.
What is the difference between Java and JavaScript?
The key distinction is that each language has its own rules and standard. JavaScript is not a Java dialect, subset or renamed version. MDN’s JavaScript reference puts it plainly: JavaScript is not “Interpreted Java.”
| Aspect | JavaScript | Java |
|---|---|---|
| Language standard | The core language is standardized as ECMAScript, in the ECMA-262 specification. ECMAScript 5.1 specification | Defined separately by the Java Language Specification. Java Language Specification, Java SE 21 |
| Where it runs | Runs in browsers and non-browser environments such as Node.js. Browser features such as the DOM are host APIs, not part of ECMAScript itself. MDN JavaScript reference | Runs in Java implementations and its own platform and runtime ecosystem. The language specification is maintained separately from ECMAScript. Java Language Specification, Java SE 21 |
| Relationship | Some syntax resembles Java, but the languages have different syntax, semantics and uses. MDN JavaScript reference | A distinct language; JavaScript is not a form of Java. MDN JavaScript reference |
What are JavaScript and ECMAScript?
JavaScript is the familiar name for the language developers use. ECMAScript is the name of its standardized core: the specification describes language features and behavior so implementations can follow a common standard. The formal standard is ECMA-262. ECMAScript 5.1 specification MDN JavaScript reference
When JavaScript runs in a browser, the environment supplies additional capabilities. For example, the DOM lets code work with a web page’s structure. Those browser APIs are not the ECMAScript language itself. JavaScript also runs outside browsers; Node.js is one such environment. MDN JavaScript reference
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Why do the names sound alike?
The names are similar, and ECMAScript syntax intentionally resembles Java syntax. Java is also listed among the influences on ECMAScript’s original design. Those points help explain why the languages can look familiar at a glance, but they do not make JavaScript a version of Java or establish that the two share the same semantics. ECMAScript 5.1 specification
The sources cited here establish the naming and syntax resemblance, but not a detailed account of the decision to call the language JavaScript. A more specific story about the naming would need separate historical documentation.
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How did the languages begin?
JavaScript and ECMAScript
The ECMAScript 5.1 specification credits Brendan Eich at Netscape with inventing JavaScript and says it first appeared in Navigator 2.0. The standardization process began in 1996; Ecma International records that its General Assembly approved the first ECMAScript standard in June 1997, with final naming work continuing that September. ECMAScript 5.1 specification Ecma International: ECMAScript history
Java
Java was originally called Oak and was designed by James Gosling for embedded consumer-electronic applications, according to the preface to the Java Language Specification. Java Language Specification, Java SE 21, Chapter 1
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How should you compare them when choosing a language?
Start with the application and the environment where it must run, then check the language’s actual rules and available APIs. A shared-looking keyword or familiar punctuation is not enough to predict how a program behaves.
Quick Recap
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- Application and environment: Identify whether the target is a browser, a server-side runtime or a Java platform. JavaScript is used in browsers and in non-browser runtimes such as Node.js; Java belongs to a separate platform and runtime ecosystem. MDN JavaScript reference Java Language Specification, Java SE 21
- Language rules: Consult the relevant specification rather than assuming one language behaves like the other: ECMAScript for JavaScript’s standardized core, and the Java Language Specification for Java. ECMAScript 5.1 specification Java Language Specification, Java SE 21
- APIs and runtime details: Distinguish language features from environment-provided features, such as the browser DOM. Detailed comparisons of compilation, typing, memory, concurrency and performance depend on language versions and runtime implementations; there is no single meaningful value that applies across all of them.
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