Java class file: Difference between revisions

Revision as of 15:03, 14 April 2025

Latest revision as of 18:11, 7 July 2025

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===Sections===

There are 10 basic sections to the Java class file structure:

* '''[[Magic number (programming)|Magic Number]]''': <code>0xCAFEBABE</code>

* '''Version of Class File Format''': the minor and major versions of the class file

* '''Constant Pool''': Pool of constants for the class

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|}

===Representation inof a C-likeclass programming languagefile===

The following is a representation of a {{mono|.class}} file as if it were a C-style struct.

Since [[C (programming language)|C]] does not support multiple variable length arrays within a struct, the code below won't compile and only serves as a demonstration.

<syntaxhighlight lang="ccpp">

struct Class_File_FormatClassFileFormat {

u4 magic_numbermagicNumber;

u2 minor_versionminorVersion;

u2 major_versionmajorVersion;

u2 constant_pool_countconstantPoolCount;

ConstantPoolInfo[constantPoolCount - 1] constantPool;

cp_info constant_pool[constant_pool_count - 1];

u2 access_flagsaccessFlags;

u2 this_classthisClass;

u2 super_classsuperClass;

u2 interfaces_countinterfacesCount;

u2[interfacesCount] interfaces;

u2 interfaces[interfaces_count];

u2 fields_countfieldsCount;

FieldInfo[fieldsCount] fields;

field_info fields[fields_count];

u2 methods_countmethodsCount;

MethodInfo[methodsCount] methods;

method_info methods[methods_count];

u2 attributes_countattributesCount;

AttributeInfo[attributesCount] attributes;

attribute_info attributes[attributes_count];

}

</syntaxhighlight>