<pedrocorreia.net ⁄>

<Bytecode basics ⁄ >

clicks: 3572 3572 2006-10-19 2006-10-19 goto tecnologia myNews tecnologia  Bookmark This Bookmark This

Welcome to another installment of "Under The Hood." This column gives Java developers a glimpse of what is going on beneath their running Java programs. This month's article takes an initial look at the bytecode instruction set of the Java virtual machine (JVM). The article covers primitive types operated upon by bytecodes, bytecodes that convert between types, and bytecodes that operate on the stack. Subsequent articles will discuss other members of the bytecode family.

The bytecode format
Bytecodes are the machine language of the Java virtual machine. When a JVM loads a class file, it gets one stream of bytecodes for each method in the class. The bytecodes streams are stored in the method area of the JVM. The bytecodes for a method are executed when that method is invoked during the course of running the program. They can be executed by intepretation, just-in-time compiling, or any other technique that was chosen by the designer of a particular JVM.

A method's bytecode stream is a sequence of instructions for the Java virtual machine. Each instruction consists of a one-byte opcode followed by zero or more operands. The opcode indicates the action to take. If more information is required before the JVM can take the action, that information is encoded into one or more operands that immediately follow the opcode.

este é só um excerto do artigo, para aceder ao artigo completo, clique no link em baixo:
this is just a small excerpt from the article, to access the full article please click in the link below:


Subscribe News RSS  Subscribe News Updates by E-mail

myNews <myNews show="rand" cat="tecnologia" ⁄>

MongoDb Architecture new ...

NOSQL has become a very heated topic for large web-scale deployment where scalability and semi-struc (...)

clicks: 18023 18023 2012-05-14 2012-05-14 goto url (new window) horicky.blogspo... goto myNews tecnologia

A Hopefully Fair and Useful Comparison of Haskell Web Frameworks new ...

Recently there has been a lot of discussion and questions about the differences between the big thre (...)

clicks: 14575 14575 2012-05-13 2012-05-13 goto url (new window) softwaresimply.... goto myNews tecnologia

Retina graphics for your website new ...

retina.js is an open source script that makes it easy to serve high-resolution images to devices wit (...)

clicks: 14409 14409 2012-05-11 2012-05-11 goto url (new window) retinajs.com/ goto myNews tecnologia

What every programmer should know about memory, Part 1 new ...

In the early days computers were much simpler. The various components of a system, such as the CPU, (...)

clicks: 15760 15760 2012-05-10 2012-05-10 goto url (new window) lwn.net/Article... goto myNews tecnologia

The State Of HTML5 Video

HTML5 has entered the online video market, which is both exciting and challenging for developers in (...)

clicks: 6305 6305 2012-02-14 2012-02-14 goto url (new window) longtailvideo.c... goto myNews tecnologia

A Tour of Amazon's DynamoDB

Amazon's recent release of DynamoDB, a database whose name is inspired by Dynamo, the key-value data (...)

clicks: 5981 5981 2012-02-13 2012-02-13 goto url (new window) paperplanes.de/... goto myNews tecnologia

Video: CSS3 Secrets: 10 things you might not know about CSS3

A number of prominent front-end developers delivered helpful talks at this year's Fronteers 2011 con (...)

clicks: 6521 6521 2011-11-30 2011-11-30 goto url (new window) css.dzone.com/a... goto myNews tecnologia

Google BigQuery Service: Big data analytics at Google speed

Rapidly crunching terabytes of big data can lead to better business decisions, but this has traditio (...)

clicks: 5659 5659 2011-11-30 2011-11-30 goto url (new window) googlecode.blog... goto myNews tecnologia