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defineClass详解

protected final Class<?> defineClass(String name,

                                     byte[] b,                                      int off,                                      int len)                              throws ClassFormatError 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 ProtectionDomain to the newly defined class. The ProtectionDomain is effectively granted the same set of permissions returned when Policy.getPolicy().getPermissions(new CodeSource(null, null)) is invoked. The default domain is created on the first invocation of defineClass, and re-used on subsequent invocations. To assign a specific ProtectionDomain to the class, use the defineClass method that takes a ProtectionDomain as one of its arguments.

Parameters: name - The expected binary name of the class, or null if not known b - 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 The Java™ Virtual Machine Specification. off - The start offset in b of the class data len - The length of the class data

Returns: The Class object that was created from the specified class data.

Throws: ClassFormatError - If the data did not contain a valid class IndexOutOfBoundsException - If either off or len is negative, or if off+len is greater than b.length. SecurityException - If an attempt is made to add this class to a package that contains classes that were signed by a different set of certificates than this class (which is unsigned), or if name begins with "java.".

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