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Jenniferlinn
Joined: 24 Dec 2008
Posts: 23
Location: UK
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 Posted: Fri Jan 02, 2009 12:10 pm Post subject: Difference betwwen java and javascript |
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The main difference is that :
Java can stand on its own while JavaScript must be placed inside an HTML document to function. Java is a much larger and more complicated language that creates "standalone" applications. A Java "applet" (so-called because it is a little application) is a fully contained program. JavaScript is text that is fed into a browser that can read it and then is enacted by the browser.
Another major difference is how the language is presented to the end user (that's you when you're surfing). Java must be compiled into what is known as a "machine language" before it can be run on the Web. Basically what happens is after the programmer writes the Java program and checks it for errors, he or she hands the text over to another computer program that changes the text code into a smaller language. That smaller language is formatted so that it is seen by the computer as a set program with definite beginning and ending points. Nothing can be added to it and nothing can be subtracted without destroying the program.
JavaScript is text-based. You write it to an HTML document and it is run through a browser. You can alter it after it runs and run it again and again. Once the Java is compiled, it is set. Sure, you can go back to the original text and alter it, but then you need to compile again.
Java applets run independent of the HTML document that is calling for them. Sure, they appear on the page, but the HTML document did little more than call for the application and place it. If the programmer allows it, oftentimes parameters can be set by the HTML document. This includes the background color of the applet of the type of text it displays, etc. The delivery of the applet is done through a download. The HTML document calls for the application, it downloads to the user's cache, and waits to run. JavaScript is wholly reliant on the browser to understand it and make it come to life.
In my opinion, JavaScript's main benefit is that it can be understood by the common human. It is much easier and more robust than Java. It allows for fast creation of Web page events. Many JavaScript commands are what are known as Event Handlers: They can be embedded right into existing HTML commands. JavaScript is a little more forgiving than Java. It allows more freedom in the creation of objects. Java is very rigid and requires all items to be denoted and spelled out. JavaScript allows you to call on an item that already exists, like the status bar or the browser itself, and play with just that part. JavaScript is geared to Web pages. Java is geared toward where it is needed most at the time.
At last but not least, both will create great Web page events. Both can offer interaction between the user and your Web page. But they are not created equally by any means.
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