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why python annoys me
D-Mandsh8290 at rit.edu
Thu Apr 19 14:07:13 EDT 2001
On Thu, Apr 19, 2001 at 01:35:10PM +0200, Alex Martelli wrote:| "D-Man" <dsh8290 at rit.edu> wrote in message<java arrays>| > They are objects (of a sort, more like a C struct IMO), but they do| > not inherit from java.lang.Object and thus can't be passed to a method| > that wants a java.lang.Object.|| Not in the Java I know.I just checked with a compiler, and you are right. I don't know why Ithought they were so different.| > Also where is the inheritance hierarchy for arrays you mentioned?|| In Java, if X inherits from Y, then array-of-X inherits from array-of-Y.I wasn't thinking of that.| This, given mutability, is unfortunately wrong, and breaches Java's| compile-time type-safety: you can pass an array-of-X to a method| as an array-of-Y argument, and the method then tries to stick into| the array a Y instance (compile-time correct) that is not an X --| and you get a runtime type violation (specs mandate that a specific| exception be raised for this, fortunately, so you don't get random| undiagnosed errors as you might for similar array bloopers in C++).(Python) lists are much better (also with runtime lookups, rather thancompile-time constant offsets) :-).-D
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