这些都可以在网上查到的http://en.wikipedia.org/wiki/Object_composition
http://docs.oracle.com/javase/6/docs/api/
(more...)
好像理解错你的问题了
应该是这两个连接
http://docs.oracle.com/javase/specs/jls/se7/html/jls-15.html#jls-15.18.1
http://docs.oracle.com/javase/specs/jls/se7/html/jls-5.html#jls-5.1.11
http://docs.oracle.com/javase/specs/jls/se7/html/jls-15.html#jls-15.18.1
http://docs.oracle.com/javase/specs/jls/se7/html/jls-5.html#jls-5.1.11
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