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Topic: Class file format


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In the News (Sun 20 Dec 09)

  
  ClassDesigner's WebLog : Class Designer File Format
The reason to use the XML format is for its brevity and simplicity.
Class: For each class (box) shape in the diagram, it has a corresponding element Class in the file.
Wrt the schema file, we are not planning at this stage to make it available to the general public...
blogs.gotdotnet.com /classdesigner/archive/2005/07/29/444501.aspx   (873 words)

  
  Class (file format) - Wikipedia, the free encyclopedia
As of 2006, the modification of the class file format is being considered under Java Specification Request (JSR) 202.
I was re-vamping some file format code and needed a couple of magic numbers: one for the persistent object file, and one for classes.
I used CAFEDEAD for the object file format, and in grepping for 4 character hex words that fit after "CAFE" (it seemed to be a good theme) I hit on BABE and decided to use it.
en.wikipedia.org /wiki/Class_(file_format)   (372 words)

  
 vmspec.: Class File Format- Overview   (Site not responding. Last check: 2007-10-30)
Class files are used to hold compiled versions of both Java classes and Java Interfaces.
The class file format is described in terms similar to a C structure.
Class file readers are expected to skip over and ignore the information in any attributes that they do not understand.
sunsite.dcc.uchile.cl /hotjava/doc/vmspec/vmspec_37.html   (241 words)

  
 The Java Class File Format
The class file consists of some data of fixed length and lots of data of variable length and quantity, often nested inside other data of variable length.
The JVM would just read the class file once and either store the data from the class file temporarily in a more easily accessed (but larger) format, or just remember where everything is in the class file.
Classes are indicated by an 'L', followed by the path to the class name, then a semi-colon to mark the end of the class name.
www.murrayc.com /learning/java/java_classfileformat.shtml   (1154 words)

  
 Dr. Dobb's | Inside Java Class Files | July 22, 2001
Class files are structured around a linear, record-based organization, somewhat similar to 80x86 OMF object files (see Figure 1).
The constant pool of a class file is similar to the symbol table in a traditional object file; see Figures 1(a) and 1(f).
At the end of the class file (Figure 1(e)) is a separate section for other attributes that apply to the class as a whole.
www.ddj.com /184410465   (2443 words)

  
 BCEL - Byte Code Engineering Library (BCEL)
While the original class files always remain unaltered, the behavior of the class loader may be reconfigured for every execution or instrumented dynamically.
The classes may be used to read and write class files from or to a file.
Class loaders are responsible for loading class files from the file system or other resources and passing the byte code to the Virtual Machine.
jakarta.apache.org /bcel/manual.html   (5481 words)

  
 vmspec.: Class File Format- Format
These values are the various string constants, class names, field names, and others that are referred to by the class structure or by the code.
This field is a set of sixteen flags used by classes, methods, and fields to describe various properties of the field, method, or class.
Currently, the only class attribute recognized is the "SourceFile" attribute, which gives the name of the source file from which this class file was compiled.
www.mathematik.uni-ulm.de /hotjava/doc/vmspec/vmspec_38.html   (726 words)

  
 The Java class file lifestyle
In their order of appearance in the class file, the major components are: magic, version, constant pool, access flags, this class, super class, interfaces, fields, methods, and attributes.
Information stored in the class file often varies in length -- that is, the actual length of the information cannot be predicted before loading the class file.
These numbers identify the version of the class file format to which a particular class file adheres and allow JVMs to verify that the class file is loadable.
www.javaworld.com /javaworld/jw-07-1996/jw-07-classfile.html   (982 words)

  
 Music File Format   (Site not responding. Last check: 2007-10-30)
The MP3 file format is the most used music file format in Windows based computers today.
WMA files are smaller in size than MP3 files, but still retain a decent level of sound quality.
This quite new file format is getting more and more popular in websites for sampling music and also in portable music players.
members.cox.net /tlcug-classes/music_file_format.htm   (351 words)

  
 Chapter 4. Class of 1.1
Executable files contain some information in a header which informs the operating system that this file is a program and has certain requirements in order to run.
In some respects, the class file is the Java equivalent of an object module rather than an executable program file; that is, it contains compiled machine code, but may also contain references to methods and fields which exist in other classes and hence in other class files.
Class files are the last stage of the development process in Java.
medialab.di.unipi.it /web/doc/JNetSec/jns_ch4.htm   (5189 words)

  
 INTRODUCTION TO CLASS FILES
When a ".java" file is compiled by a java compiler it produces ".class" file.
Thus we have 1 to 17 variable length structures which gives the informations about the string constants, class names, field names and other constants that are referred to within the class file structures and its subststuctures.
HEX DEC CHAR 01 01 00 00 03 03 61 97 a 61 97 a 61 97 a
www.vijaymukhi.com /vmis/classprj.htm   (2491 words)

  
 Java programming dynamics, Part 1: Classes and class loading
Following the signature are a pair of class format version numbers (in this case, for minor version 0 and major version 46 -- 0x2e in hexadecimal -- as generated by the 1.4.1 javac), then a count of entries in the constant pool.
Class loaders normally keep a map of the classes they've loaded, to be able to find one by name if it's requested again.
Even though the names and binary implementations of the interfaces and classes are the same, an instance of the class from one loader cannot be recognized as implementing the interface from the other loader.
www.ibm.com /developerworks/library/j-dyn0429/index.html   (3352 words)

  
 VM Spec The class File Format
file format, such as a compiler, can use this marking to advise the user that a superseded class, interface, method, or field is being referred to.
The type of every class instance that is the target of a method invocation instruction must be assignment compatible (§2.6.7) with the class or interface type specified in the instruction.
After an appropriate instance initialization method is invoked (from the current class or the current superclass) on this object, all occurrences of this special type on the verifier's model of the operand stack and in the local variable array are replaced by the current class type.
java.sun.com /docs/books/jvms/second_edition/html/ClassFile.doc.html   (9784 words)

  
 Java Class File Format
You can compare a class file to a compiled C or Pascal program.
The difference is that a compiled C or Pascal code consists of machine code which is platform dependent while Java class file is made of so called bytecode which is platform independent.
Source file index = index of an entry in the constant pool which contains the name of the file from which the class file was created.
rohitranjan.tripod.com /htmlfiles/class_format.htm   (1761 words)

  
 ONJava.com -- Analyze Your Classes
This file is binary and contains the instruction set and data of your class for the JVM to execute.
A magic number is not just Java's way of identifying class files; a magic number is used to identify a file as a particular type by other types of file types as well, like GIF or JPEG, which have their own magic numbers.
Since the symbolic references to classes, fields, and methods is coded with String constants, the Constant Pool, which contains these String constants in the Java Class file, is the biggest portion of a class file.
www.onjava.com /pub/a/onjava/2003/10/22/bcel.html   (1382 words)

  
 The .Class File
Once the.class file is ready, all you have to do is place the file on a Web server and place the applet tag in the appropriate HTML file.
So a class file is made up of byte codes and these byte codes are interpreted and acted upon by the JVM or the Java Virtual Machine or Engine.
The.class file format is an industry standard and what we describe here holds true across all the Java compilers.
www.vijaymukhi.com /vmis/jclass.htm   (3062 words)

  
 Class File format
file contains the description of a class and how it is connected to other classes.
file is thoroughly specified and it contains all the information that is needed to execute Java methods.
is a pointer to an object of the built-in class
hem.passagen.se /hjersing/rapport/node5.html   (457 words)

  
 Javad: A Java Class File Disassembler
When compiling a Java class that references a class outside of the current file, the Java compiler uses the symbol information in the class file to resolve local references and to do semantic checking.
Certainly the class structure of Java is simplar to that of C++.
After a class file is read into a control flow graph it can be optimized and native code can be generated.
www.bearcave.com /software/java/javad   (1593 words)

  
 SGI TPL (IRIX 6.5: Developer/IL_PG - Appendix E. Implementing Your Own Image File Format)
The portions of the memory buffer corresponding to the area outside of the rectangular boundaries of the source file image are left undisturbed.
Because the base class constructor is invoked automatically when the DSO is opened (because of the static object declaration) the derived format is placed on the global format list as part of its initialization.
Tells whether the image file format supports the given page size pWidth, pHeight, pz, pc for an image whose size is iWidth, iHeight, iz, ic, which must be a supported image size.
techpubs.sgi.com /library/tpl/cgi-bin/getdoc.cgi?coll=0650&db=bks&fname=/SGI_Developer/IL_PG/ape.html   (3206 words)

  
 Peter Bertelsen - proposal for improving the JVM   (Site not responding. Last check: 2007-10-30)
This document proposes a few changes to the Java class file format and the JVM instruction set, as defined in
The class file format includes redundant information and may be simplified in a number of ways.
In other words, the above items could be removed from the class file format with no loss of information.
www.dina.kvl.dk /~pmb/jvm-suggestions.html   (713 words)

  
 vmspec.: Class File Format- Methods
If catch_type is non-zero, then constant_pool[catch_type] will be the class of exceptions that this exception handler is designated to catch.
Each entry in the line number table indicates that the line number in the source file changes at a given point in the code.
The Local Variable Table is used by debuggers to determine the value of a given local variable during the dynamic execution of a method.
www.mathematik.uni-ulm.de /hotjava/doc/vmspec/vmspec_39.html   (759 words)

  
 vmspec: Class File Format   (Site not responding. Last check: 2007-10-30)
Each class file contains the compiled version of either a Java class or a Java interface.
A Java class file consists of a stream of 8-bit bytes.
The class file format is described here using a structure notation.
www.ecst.csuchico.edu /~amk/java/vmspec/vmspec-5.html   (134 words)

  
 Inside J2VM Interactive Illustrations - Getting Loaded
The class file being loaded in the simulation was generated by the
Although the snippet of code used in the simulation may not be very useful in the real world, it does compile to a real class file and provides a reasonably simple example of the class file format.
This is the same class used in the Eternal Math simulation applet that accompanies Chapter 5, "The Java Virtual Machine."
www.cs.montana.edu /~kintzing/GettingLoaded.html   (435 words)

  
 Bruce Eckel's MindView, Inc: 12-03-2004 JDK 5 Class File Format Puzzle   (Site not responding. Last check: 2007-10-30)
This follows the class file information that we had, and we seemed to get it working, but later discovered that it only works on some files.
Other files that appear to include some Java 5 constructs will trip it up.
Those same files fail with Jasper, as well, so it appears that the class file format has changed for JDK 5.
mindview.net /WebLog/log-0067   (340 words)

  
 Java Class file format : Java Glossary
You are here : home ⇐ Java Glossary ⇐ J words ⇐ Java Class file format.
Compiled Java is typically distributed in a very compact format called Class files.
Class files are usually compressed and bundled into jar files.
mindprod.com /jgloss/javaclassformat.html   (162 words)

  
 ClickHeat | Heatmap PHP class
Since release 1.2, heatmap generation is inside a PHP class.
Result of this function is an array of various values, including the width, height, number of images and file paths of the final heatmap
adds the file $file to the list of files which will be imported (check for existence of the file, but doesn't return any error)
www.labsmedia.com /clickheat/heatmap.html   (452 words)

  
 Abstract - Java Class File Encryption   (Site not responding. Last check: 2007-10-30)
This presentation will discuss the Java class file format and the ability to get the source code that was used to write the class files.
Also, the presentation will show how the Blowfish encryption algorithm can be used in order to prevent malicious users from decompiling Java class files, while still allowing the encrypted class files to be loaded by the Java Virtual Machine.
Finally, the presentation will discuss the pros and cons of using this method of encryption on Java class files.
csis.pace.edu /csis/html/sec_html/abstract_JCFE.html   (122 words)

  
 Cenqua User Forums: Bad class file format ...
The compiler is complaining about "Bad class file format" on a particular class file.
I checked the jvm spec and nothing jumped out at me, but Cygwin on Windows 2000 says the file name is too long when I try to delete it and the Windows Explorer shows a truncated contextual menu for it.
I don't really care if that file is instrumented because it's not what I'm testing.
www.cenqua.com /forums/message.jspa?messageID=11060   (167 words)

  
 NetPortFormatC<class DataT> - File format information for NetPort's.   (Site not responding. Last check: 2007-10-30)
By instantiating this class as a static variable you can allow net ports to be open with the standard 'Load' or 'OpenISequence' methods.
You have to make an instance of this class for each type you wish to handle.
The default version of this functions opens the file and passes the stream to CreateInput(IStreamC....)
www.ee.surrey.ac.uk /Research/VSSP/RavlDoc/share/doc/RAVL/Auto/Basic/Class/RavlN.NetPortFormatC.html   (551 words)

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