ClassLoader.DefineClass Method
Definition
Important
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Overloads
| DefineClass(Byte[], Int32, Int32) |
Obsolete.
Converts an array of bytes into an instance of class |
| DefineClass(String, ByteBuffer, ProtectionDomain) |
Converts a |
| DefineClass(String, Byte[], Int32, Int32) |
Converts an array of bytes into an instance of class |
| DefineClass(String, Byte[], Int32, Int32, ProtectionDomain) |
Converts an array of bytes into an instance of class |
DefineClass(Byte[], Int32, Int32)
Caution
deprecated
Converts an array of bytes into an instance of class Class.
[Android.Runtime.Register("defineClass", "([BII)Ljava/lang/Class;", "")]
[System.Obsolete("deprecated")]
protected Java.Lang.Class? DefineClass (byte[]? b, int off, int len);[<Android.Runtime.Register("defineClass", "([BII)Ljava/lang/Class;", "")>]
[<System.Obsolete("deprecated")>]
member this.DefineClass : byte[] * int * int -> Java.Lang.ClassParameters
- b
- Byte[]
The bytes that make up the class data. The bytes in positions
off through off+len-1 should have the format
of a valid class file as defined by
<cite>The Java™ Virtual Machine Specification</cite>.
- off
- Int32
The start offset in b of the class data
- len
- Int32
The length of the class data
Returns
The Class object that was created from the specified
class data
- Attributes
Exceptions
if classRep does not contain a valid class.
if offset , length or if
offset + length is greater than the length of
classRep.
Remarks
Converts an array of bytes into an instance of class Class. Before the Class can be used it must be resolved. This method is deprecated in favor of the version that takes a binary name as its first argument, and is more secure.
This member is deprecated. Replaced by #defineClass(String, byte[], int, int) defineClass(String, byte[], int, int)
Java documentation for java.lang.ClassLoader.defineClass(byte[], int, int).
Portions of this page are modifications based on work created and shared by the Android Open Source Project and used according to terms described in the Creative Commons 2.5 Attribution License.
Applies to
DefineClass(String, ByteBuffer, ProtectionDomain)
Converts a java.nio.ByteBuffer <tt>ByteBuffer</tt>
into an instance of class Class,
with an optional ProtectionDomain.
[Android.Runtime.Register("defineClass", "(Ljava/lang/String;Ljava/nio/ByteBuffer;Ljava/security/ProtectionDomain;)Ljava/lang/Class;", "")]
protected Java.Lang.Class? DefineClass (string? name, Java.Nio.ByteBuffer? b, Java.Security.ProtectionDomain? protectionDomain);[<Android.Runtime.Register("defineClass", "(Ljava/lang/String;Ljava/nio/ByteBuffer;Ljava/security/ProtectionDomain;)Ljava/lang/Class;", "")>]
member this.DefineClass : string * Java.Nio.ByteBuffer * Java.Security.ProtectionDomain -> Java.Lang.ClassParameters
- name
- String
The expected binary name. of the class, or
null if not known
The bytes that make up the class data. The bytes from positions
b.position() through b.position() + b.limit() -1
should have the format of a valid class file as defined by
<cite>The Java™ Virtual Machine Specification</cite>.
- protectionDomain
- ProtectionDomain
The ProtectionDomain of the class, or null.
Returns
The Class object created from the data,
and optional ProtectionDomain.
- Attributes
Exceptions
if b does not contain a valid class.
if className is not equal to the name of the class
contained in b.
Remarks
Converts a java.nio.ByteBuffer <tt>ByteBuffer</tt> into an instance of class Class, with an optional ProtectionDomain. If the domain is null, then a default domain will be assigned to the class as specified in the documentation for #defineClass(String, byte[], int, int). Before the class can be used it must be resolved.
The rules about the first class defined in a package determining the set of certificates for the package, and the restrictions on class names are identical to those specified in the documentation for #defineClass(String, byte[], int, int, ProtectionDomain).
An invocation of this method of the form cl.defineClass(name,bBuffer,pd) yields exactly the same result as the statements
...<br> byte[] temp = new byte[bBuffer.java.nio.ByteBuffer#remaining remaining()];<br> bBuffer.java.nio.ByteBuffer#get(byte[]) get(temp);<br> return #defineClass(String, byte[], int, int, ProtectionDomain) cl.defineClass(name, temp, 0, temp.length, pd);<br>
Added in 1.5.
Portions of this page are modifications based on work created and shared by the Android Open Source Project and used according to terms described in the Creative Commons 2.5 Attribution License.
Applies to
DefineClass(String, Byte[], Int32, Int32)
Converts an array of bytes into an instance of class Class.
[Android.Runtime.Register("defineClass", "(Ljava/lang/String;[BII)Ljava/lang/Class;", "")]
protected Java.Lang.Class? DefineClass (string? name, byte[]? b, int off, int len);[<Android.Runtime.Register("defineClass", "(Ljava/lang/String;[BII)Ljava/lang/Class;", "")>]
member this.DefineClass : string * byte[] * int * int -> Java.Lang.ClassParameters
- name
- String
The expected binary name of the class, or
null if not known
- b
- Byte[]
The bytes that make up the class data. The bytes in positions
off through off+len-1 should have the format
of a valid class file as defined by
<cite>The Java™ Virtual Machine Specification</cite>.
- off
- Int32
The start offset in b of the class data
- len
- Int32
The length of the class data
Returns
The Class object that was created from the specified
class data.
- Attributes
Exceptions
if classRep does not contain a valid class.
if offset , length or if
offset + length is greater than the length of
classRep.
Remarks
Converts an array of bytes into an instance of class Class. Before the Class can be used it must be resolved.
This method assigns a default java.security.ProtectionDomain <tt>ProtectionDomain</tt> to the newly defined class. The ProtectionDomain is effectively granted the same set of permissions returned when java.security.Policy#getPermissions(java.security.CodeSource) <tt>Policy.getPolicy().getPermissions(new CodeSource(null, null))</tt> is invoked. The default domain is created on the first invocation of #defineClass(String, byte[], int, int) <tt>defineClass</tt>, and re-used on subsequent invocations.
To assign a specific ProtectionDomain to the class, use the #defineClass(String, byte[], int, int, java.security.ProtectionDomain) <tt>defineClass</tt> method that takes a ProtectionDomain as one of its arguments.
Added in 1.1.
Java documentation for java.lang.ClassLoader.defineClass(java.lang.String, byte[], int, int).
Portions of this page are modifications based on work created and shared by the Android Open Source Project and used according to terms described in the Creative Commons 2.5 Attribution License.
Applies to
DefineClass(String, Byte[], Int32, Int32, ProtectionDomain)
Converts an array of bytes into an instance of class Class,
with an optional ProtectionDomain.
[Android.Runtime.Register("defineClass", "(Ljava/lang/String;[BIILjava/security/ProtectionDomain;)Ljava/lang/Class;", "")]
protected Java.Lang.Class? DefineClass (string? name, byte[]? b, int off, int len, Java.Security.ProtectionDomain? protectionDomain);[<Android.Runtime.Register("defineClass", "(Ljava/lang/String;[BIILjava/security/ProtectionDomain;)Ljava/lang/Class;", "")>]
member this.DefineClass : string * byte[] * int * int * Java.Security.ProtectionDomain -> Java.Lang.ClassParameters
- name
- String
The expected binary name of the class, or
null if not known
- b
- Byte[]
The bytes that make up the class data. The bytes in positions
off through off+len-1 should have the format
of a valid class file as defined by
<cite>The Java™ Virtual Machine Specification</cite>.
- off
- Int32
The start offset in b of the class data
- len
- Int32
The length of the class data
- protectionDomain
- ProtectionDomain
The ProtectionDomain of the class
Returns
The Class object created from the data,
and optional ProtectionDomain.
- Attributes
Exceptions
if classRep does not contain a valid class.
if offset , length or if
offset + length is greater than the length of
classRep.
if className is not equal to the name of the class
contained in classRep.
Remarks
Converts an array of bytes into an instance of class Class, with an optional ProtectionDomain. If the domain is null, then a default domain will be assigned to the class as specified in the documentation for #defineClass(String, byte[], int, int). Before the class can be used it must be resolved.
The first class defined in a package determines the exact set of certificates that all subsequent classes defined in that package must contain. The set of certificates for a class is obtained from the java.security.CodeSource <tt>CodeSource</tt> within the ProtectionDomain of the class. Any classes added to that package must contain the same set of certificates or a SecurityException will be thrown. Note that if name is null, this check is not performed. You should always pass in the binary name of the class you are defining as well as the bytes. This ensures that the class you are defining is indeed the class you think it is.
The specified name cannot begin with "java.", since all classes in the "java.* packages can only be defined by the bootstrap class loader. If name is not null, it must be equal to the binary name of the class specified by the byte array "b", otherwise a NoClassDefFoundError <tt>NoClassDefFoundError</tt> will be thrown.
Portions of this page are modifications based on work created and shared by the Android Open Source Project and used according to terms described in the Creative Commons 2.5 Attribution License.