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📁 学习java的经典书籍

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<a href="http://www.bruceeckel.com/javabook.html">Bruce Eckel's Thinking in Java</a>
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<H1 ALIGN=LEFT>
11:
Run-time type identification
</H1>
<DIV ALIGN=LEFT><FONT FACE="Calligraph421 BT" SIZE=4 COLOR="Black">The
idea of run-time type identification (RTTI) seems fairly simple at first: it
lets you find the exact type of an object when you have a handle to only the
base type. 
</FONT><P></DIV><DIV ALIGN=LEFT><FONT FACE="Carmina Md BT" SIZE=3 COLOR="Black">However,
the 
</FONT><FONT FACE="Carmina Md BT" SIZE=3 COLOR="Black"><I>need</I></FONT><FONT FACE="Carmina Md BT" SIZE=3 COLOR="Black">
for RTTI uncovers a whole plethora of interesting (and often perplexing) OO
design issues and raises fundamental questions of how you should structure your
programs. 
</FONT><P></DIV><DIV ALIGN=LEFT><FONT FACE="Carmina Md BT" SIZE=3 COLOR="Black">This
chapter looks at the ways that Java allows you to discover information about
objects and classes at run-time. This takes two forms:
&#8220;traditional&#8221; RTTI, which assumes that you have all the types
available at compile-time and run-time, and the &#8220;reflection&#8221;
mechanism in Java 1.1,<A NAME="Index1353"></A>
which allows you to discover class information solely at run-time. The
&#8220;traditional&#8221; RTTI will be covered first, followed by a discussion
of reflection.
</FONT><a name="_Toc375545405"></a><a name="_Toc408018645"></a><P></DIV>

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