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    <p>I remember reading something about this in the book Hardcore Java:</p> <blockquote> <p>The problem with checking elements in a collection at runtime is that it is extremely expensive; the order of efficiency is only O(n). If you have only 10 addresses in your collection, checking elements is easy. However, if the collection contains 15,000 addresses, then you would incur a significant overhead whenever someone calls the setter.</p> <p>On the other hand, if you can prevent users from placing anything other than an address in your collection at compile time, then you wouldn't have to check the types at runtime. If they try to give you something that isn't an address, then the compiler will reject the attempt. This is exactly what parameterized types do.</p> </blockquote> <p>However, "why" questions can never really be satisfactorily answered because there are just too many variable involved with people, time, place and politics. I remember reading somewhere else that the decision had a lot to do with maintaining compatibility with the way things were already being done in the Java byte code. Here is another quote from the same book:</p> <blockquote> <p>After the compiler has resolved the type safety introduced by generics, it erases the parameterization from the type. Therefore, the information is not available at runtime. The purpose of erasure, as stated by Sun, is to allow class libraries built with an older version of the JDK to be able to run on the JDK 1.5 virtual machine.</p> </blockquote> <p>I'm curious, what are the advantages offered by runtime generics?</p>
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