Getalldeclaredmethods() method in httpservlet

Looking at apache-tomcat-7.0 When I saw the httpservlet in 40, I saw that the method getalldeclaredmethods () in it was written very well!

I want to say two things:

When we judge whether an array is empty, we should first judge whether the array is null, and judge the length of the array

The methods mentioned here are:

This is an array copy array function in Java Lang. system class.

Parameter meaning:

A good way to use

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