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Ó¢ÎÄÔÎĵØÖ·:
http://www.onjava.com/pub/a/onjava/2005/07/06/generics.html
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http://www.matrix.org.cn/resource/article/43/43634_java_generics.html
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int day=time.getActualMaximum(Calendar.DAY_OF_MONTH);//±¾Ô·ݵÄÌìÊý
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