from： https://www.cnblogs.com/floodpeak/archive/2008/02/27/1083533.htmlhttps://www.cnblogs.com/floodpeak/archive
阅读背景：
java 类之间的四种关系详解
来源：互联网
from： https://www.cnblogs.com/floodpeak/archive/2008/02/27/1083533.htmlhttps://www.cnblogs.com/floodpeak/archive
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