![]() To sum up thus far: Any device with a Java Runtime installed can run Java bytecode, which may have been originally written in Java or some other language. Runtime is sandboxed (much like iOS and Mac App Store apps), which was supposed to help with security, but secure sandboxes are extremely difficult to develop, and the Java sandbox hasn’t fared well - I’ll return to that issue shortly. The JVM and the Java Class Library are almost always distributed together as a package, and that package is known as the Java Runtime Environment (or JRE), commonly shortened to “Java Runtime.” The Java So, the Java Class Library takes an instruction that the JVM is trying to send to the host platform and passes it on in the form the host platform expects. Mac OS X does that one way, while Windows does it another way. For example, maybe a Java program contains an instruction to play the system beep sound. You also need a platform-specific version of the Java Class Library, which tells the JVM how to do particular tasks on that platform. Second, a JVM by itself is usually not enough to enable Java bytecode to run on a computer. In this article, we’reĬoncerned with any software that runs in a JVM, regardless of what language it was written in. So, someone could write a program in, say, Python or Ruby, and use a special compiler to build that into something that, as far as the JVM is concerned, is indistinguishable from a program written in Java. Ordinarily, this distinction wouldn’t be important to a non-programmer, except it turns out that other programming languages besides Java can also be compiled into Java bytecode, and then run by the JVM. Java bytecode isn’t Java as such, but rather a sort of intermediate language created when Java code is run through a program called a compiler. Now, there’s a little more to it than that, so please bear with me for two slightly technical paragraphs.įirst, when I say the JVM lets “Java software” run on any platform, the software I’m referring to is what’s known as Java bytecode. Each host platform has a different JVM that’s designed to run on its physical hardware - for example, Intel x86 chips have one JVM, while ARM chips have a different one. Just as a Windows virtual machine lets you run Windows on a Mac (or even within another copy of Windows), the Java Virtual Machine (JVM) lets Java software run on any platform. If you’ve ever run Windows or Linux on your Mac using an application like Parallels Desktop or VMware Fusion, you already have a general idea of what a virtual machine is - it’s an environment, created in software, that functions like a physical computer. ![]() How does Java pull off this feat of legerdemain? It relies on something called a virtual machine. (In practice, that’s a bit of an oversimplification, but it’s a convenient fiction.) Linux PC, or a smartphone without any modifications. That’s right, a given Java application can run on a Mac, a Windows PC, a It’s powerful, popular, and - crucially - designed in such a way that once a Java application is compiled, it can run on many different platforms. Let’s just say that as programming languages go, Java is a pretty nice one. I could tell you that it’s an object-oriented language largely based on C++, but if you’re a programmer you already know that, and if you aren’t, you wouldn’t care. ![]() So, for our purposes, Java is a programming language. Programming language, they toyed around with several names before settling on Java, allegedly because they, too, were coffee enthusiasts. ![]() (It also so happens that I single-handedly consume 3.5 percent of the world’s coffee hence another nickname for coffee, “Joe.”) In the early 1990s when a team of engineers at Sun Microsystems was developing a new It so happens that a great deal of high-quality coffee is grown on the island of Java, hence the nickname. Come on over some evening and we’ll show you our slides over a nice cup of… java. Bromo, an active volcano, at sunrise on my birthday. I’ve been there a couple of times, most recently when I turned 40. Java, East of Krakatoa - Java is the name of the fifth-largest (and most populous) island in Indonesia. #1642: How to identify phishing attacks, new iPhone and iPad passcode requirements.#1643: New Mac mini and MacBook Pro models, new second-gen HomePod, security-focused OS updates, industry layoffs.#1644: Explaining Mastodon and the Fediverse, HomePod Software 16.3 and tvOS 16.3, GoTo breach.#1645: AirPlay iPhone to Mac for remote video, Siri learns to restart iPhones, Apple's Q1 2023 financials.1646: Security-focused OS updates, Photos Workbench review, Mastodon client wishlist, Apple-related conferences.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |