java package and its common class Overview

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java package has: lang (no manual import) util io net sql awt swing text

java.lang class in common:

Object (parent class for all classes) common methods: clone toString hasCode the equals Finalize getClass the wait notifyAll Notify (defined as final, can not be overwritten)
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Origin www.cnblogs.com/sycamore0802/p/11247854.html

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