当方法的定义说它接受java.sql.date作为参数时，该方法如何接受java.sql.timestamp？
[英]How can a method accept java.sql.timestamp when the definition of the method says that it accepts java.sql.date as a parameter?
问题描述
I am working on a project where we have an existing util class for dates. 
我正在做一个项目，其中有一个现有的util类用于日期。 There is an method there which accepts java.sql.Date as a parameter but when while developing I pass a java.sql.Timestamp object, it is working fine. 那里有一个方法可以接受java.sql.Date作为参数，但是在开发时我传递了java.sql.Timestamp对象，它工作正常。 One thing can be that the Timestamp is the child class of Date. 一件事可能是时间戳记是Date的子类。 I need some clarity on this 我需要澄清一下
1 个解决方案
解决方案1
-1 2019-04-30 10:12:01
yep, heredity 是的，遗传
java.lang.Object
|
+----java.util.Date
|
+----java.sql.Timestamp
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