December 2004
Beginner
1512 pages
43h 39m
English
Content preview from Ivor Horton's Beginning Java™ 2, JDK™ 5th Edition
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1.4. The Java Environment
You can run Java programs on a wide variety of computers using a range of operating systems. Your Java programs will run just as well on a PC running any supported version of Microsoft Windows as it will on Linux or a Sun Solaris workstation. This is possible because a Java program does not execute directly on your computer. It runs on a standardized environment called the Java 2 Platform that has been implemented as software on a wide variety of computers and operating systems. The Java Platform consists of two elements—a software implementation of a hypothetical computer called the Java Virtual Machine (JVM) and the Java Application Programming Interface (Java API), which is a set of software components that provides the facilities you need to write a fully fledged interactive application in Java.
A Java compiler converts the Java source code that you write into a binary program consisting of bytecodes. Bytecodes are machine instructions for the Java Virtual Machine. When you execute a Java program, a program called the Java interpreter inspects and deciphers the bytecodes for it, checks it out to ensure that it has not been tampered with and is safe to execute, and then executes the actions that the bytecodes specify within the Java Virtual Machine. A Java interpreter can run standalone, or it can be part of a web browser such as Netscape Navigator, Mozilla, or Microsoft Internet Explorer where it can be invoked automatically to run applets in a web ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.