ClassFile (jdk.compiler 1.8.132 API)

java.lang.Object
- com.sun.tools.javac.jvm.ClassFile

Direct Known Subclasses:

ClassWriter
```
public class ClassFile
extends Object
```
A JVM class file.
Generic Java classfiles have one additional attribute for classes, methods and fields:
```
   "Signature" (u4 attr-length, u2 signature-index)
  
```
A signature gives the full Java type of a method or field. When used as a class attribute, it indicates type parameters, followed by supertype, followed by all interfaces.
```
     methodOrFieldSignature ::= type
     classSignature         ::= [ typeparams ] supertype { interfacetype }
  
```
The type syntax in signatures is extended as follows:
```
     type       ::= ... | classtype | methodtype | typevar
     classtype  ::= classsig { '.' classsig }
     classig    ::= 'L' name [typeargs] ';'
     methodtype ::= [ typeparams ] '(' { type } ')' type
     typevar    ::= 'T' name ';'
     typeargs   ::= '<' type { type } '>'
     typeparams ::= '<' typeparam { typeparam } '>'
     typeparam  ::= name ':' type
  
```
This class defines constants used in class files as well as routines to convert between internal ``.'' and external ``/'' separators in class names.
This is NOT part of any supported API. If you write code that depends on this, you do so at your own risk. This code and its internal interfaces are subject to change or deletion without notice.

Nested Class Summary

Nested Classes
Modifier and Type Class and Description

static class ClassFile.NameAndType
A class for the name-and-type signature of a method or field.

static class ClassFile.Version

Nested Classes
Modifier and Type	Class and Description
`static class`	`ClassFile.NameAndType` A class for the name-and-type signature of a method or field.
`static class`	`ClassFile.Version`

Field Summary

Fields
Modifier and Type	Field and Description
`static int`	`CONSTANT_Class`
`static int`	`CONSTANT_Double`
`static int`	`CONSTANT_Fieldref`
`static int`	`CONSTANT_Float`
`static int`	`CONSTANT_Integer`
`static int`	`CONSTANT_InterfaceMethodref`
`static int`	`CONSTANT_InvokeDynamic`
`static int`	`CONSTANT_Long`
`static int`	`CONSTANT_MethodHandle`
`static int`	`CONSTANT_Methodref`
`static int`	`CONSTANT_MethodType`
`static int`	`CONSTANT_NameandType`
`static int`	`CONSTANT_String`
`static int`	`CONSTANT_Unicode`
`static int`	`CONSTANT_Utf8`
`static int`	`JAVA_MAGIC`
`static int`	`MAX_CODE`
`static int`	`MAX_DIMENSIONS`
`static int`	`MAX_LOCALS`
`static int`	`MAX_PARAMETERS`
`static int`	`MAX_STACK`
`static int`	`REF_getField`
`static int`	`REF_getStatic`
`static int`	`REF_invokeInterface`
`static int`	`REF_invokeSpecial`
`static int`	`REF_invokeStatic`
`static int`	`REF_invokeVirtual`
`static int`	`REF_newInvokeSpecial`
`static int`	`REF_putField`
`static int`	`REF_putStatic`

Constructor Summary

Constructors
Constructor and Description

ClassFile()

Constructors
Constructor and Description
`ClassFile()`

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method and Description
`static byte[]`	`externalize(byte[] buf, int offset, int len)` Return external representation of buf[offset..offset+len-1], converting '.' to '/'.
`static byte[]`	`externalize(Name name)` Return external representation of given name, converting '/' to '.'.
`static byte[]`	`internalize(byte[] buf, int offset, int len)` Return internal representation of buf[offset..offset+len-1], converting '/' to '.'.
`static byte[]`	`internalize(Name name)` Return internal representation of given name, converting '/' to '.'.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - JAVA_MAGIC
```
public static final int JAVA_MAGIC
```
    See Also:
    
    Constant Field Values
  - CONSTANT_Utf8
```
public static final int CONSTANT_Utf8
```
    See Also:
    
    Constant Field Values
  - CONSTANT_Unicode
```
public static final int CONSTANT_Unicode
```
    See Also:
    
    Constant Field Values
  - CONSTANT_Integer
```
public static final int CONSTANT_Integer
```
    See Also:
    
    Constant Field Values
  - CONSTANT_Float
```
public static final int CONSTANT_Float
```
    See Also:
    
    Constant Field Values
  - CONSTANT_Long
```
public static final int CONSTANT_Long
```
    See Also:
    
    Constant Field Values
  - CONSTANT_Double
```
public static final int CONSTANT_Double
```
    See Also:
    
    Constant Field Values
  - CONSTANT_Class
```
public static final int CONSTANT_Class
```
    See Also:
    
    Constant Field Values
  - CONSTANT_String
```
public static final int CONSTANT_String
```
    See Also:
    
    Constant Field Values
  - CONSTANT_Fieldref
```
public static final int CONSTANT_Fieldref
```
    See Also:
    
    Constant Field Values
  - CONSTANT_Methodref
```
public static final int CONSTANT_Methodref
```
    See Also:
    
    Constant Field Values
  - CONSTANT_InterfaceMethodref
```
public static final int CONSTANT_InterfaceMethodref
```
    See Also:
    
    Constant Field Values
  - CONSTANT_NameandType
```
public static final int CONSTANT_NameandType
```
    See Also:
    
    Constant Field Values
  - CONSTANT_MethodHandle
```
public static final int CONSTANT_MethodHandle
```
    See Also:
    
    Constant Field Values
  - CONSTANT_MethodType
```
public static final int CONSTANT_MethodType
```
    See Also:
    
    Constant Field Values
  - CONSTANT_InvokeDynamic
```
public static final int CONSTANT_InvokeDynamic
```
    See Also:
    
    Constant Field Values
  - REF_getField
```
public static final int REF_getField
```
    See Also:
    
    Constant Field Values
  - REF_getStatic
```
public static final int REF_getStatic
```
    See Also:
    
    Constant Field Values
  - REF_putField
```
public static final int REF_putField
```
    See Also:
    
    Constant Field Values
  - REF_putStatic
```
public static final int REF_putStatic
```
    See Also:
    
    Constant Field Values
  - REF_invokeVirtual
```
public static final int REF_invokeVirtual
```
    See Also:
    
    Constant Field Values
  - REF_invokeStatic
```
public static final int REF_invokeStatic
```
    See Also:
    
    Constant Field Values
  - REF_invokeSpecial
```
public static final int REF_invokeSpecial
```
    See Also:
    
    Constant Field Values
  - REF_newInvokeSpecial
```
public static final int REF_newInvokeSpecial
```
    See Also:
    
    Constant Field Values
  - REF_invokeInterface
```
public static final int REF_invokeInterface
```
    See Also:
    
    Constant Field Values
  - MAX_PARAMETERS
```
public static final int MAX_PARAMETERS
```
    See Also:
    
    Constant Field Values
  - MAX_DIMENSIONS
```
public static final int MAX_DIMENSIONS
```
    See Also:
    
    Constant Field Values
  - MAX_CODE
```
public static final int MAX_CODE
```
    See Also:
    
    Constant Field Values
  - MAX_LOCALS
```
public static final int MAX_LOCALS
```
    See Also:
    
    Constant Field Values
  - MAX_STACK
```
public static final int MAX_STACK
```
    See Also:
    
    Constant Field Values
- Constructor Detail
  - ClassFile
```
public ClassFile()
```
- Method Detail
  - internalize
```
public static byte[] internalize(byte[] buf,
                                 int offset,
                                 int len)
```
    Return internal representation of buf[offset..offset+len-1], converting '/' to '.'.
  - internalize
```
public static byte[] internalize(Name name)
```
    Return internal representation of given name, converting '/' to '.'.
  - externalize
```
public static byte[] externalize(byte[] buf,
                                 int offset,
                                 int len)
```
    Return external representation of buf[offset..offset+len-1], converting '.' to '/'.
  - externalize
```
public static byte[] externalize(Name name)
```
    Return external representation of given name, converting '/' to '.'.

Class ClassFile

Nested Class Summary

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

JAVA_MAGIC

CONSTANT_Utf8

CONSTANT_Unicode

CONSTANT_Integer

CONSTANT_Float

CONSTANT_Long

CONSTANT_Double

CONSTANT_Class

CONSTANT_String

CONSTANT_Fieldref

CONSTANT_Methodref

CONSTANT_InterfaceMethodref

CONSTANT_NameandType

CONSTANT_MethodHandle

CONSTANT_MethodType

CONSTANT_InvokeDynamic

REF_getField

REF_getStatic

REF_putField

REF_putStatic

REF_invokeVirtual

REF_invokeStatic

REF_invokeSpecial

REF_newInvokeSpecial

REF_invokeInterface

MAX_PARAMETERS

MAX_DIMENSIONS

MAX_CODE

MAX_LOCALS

MAX_STACK

Constructor Detail

ClassFile

Method Detail

internalize

internalize

externalize

externalize