Re: Casting

From:
Eric Sosman <esosman@ieee-dot-org.invalid>
Newsgroups:
comp.lang.java.help
Date:
Wed, 26 Dec 2007 17:44:58 -0500
Message-ID:
<tpKdncXvaJvrRO_anZ2dnUVZ_uWlnZ2d@comcast.com>
Mark Space wrote:

Eric Sosman wrote:

static int mem[] = cast2arrayOfBytes(base);

((int)mem[ADDR - base - 0x0C])&0xFF can be now read or written what
will result in a read or write access to the memory location ADDR


    Whatever this is supposed to be, it is (1) almost
certainly mis-transcribed and (2) not Java.


Or (d) is in fact making a call outside of the JVM to set up an external
memory buffer. Or (f) using the array class in horribly broken ways.


     That's what I meant by "not Java," which may have been too
telegraphic if not downright cryptic. If by some manner of magic
you fool the JVM into giving you a byte[] whose data overlays
arbitrary memory locations, the program is non-Java despite being
written with a Java-like syntax. With such an array you could
construct a String of negative length, a boolean whose value was
neither true nor false, a mutable Integer, and an array of forty-
two Runtime instances, all distinct. That's not Java, but some
other environment entirely.

--
Eric Sosman
esosman@ieee-dot-org.invalid

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