JDK 9之后，Class对象的newInstance()方法已经被弃用。

官方推荐通过Constructor对象来使用newInstance()。

* @deprecated This method propagates any exception thrown by the
* nullary constructor, including a checked exception.  Use of
* this method effectively bypasses the compile-time exception
* checking that would otherwise be performed by the compiler.
* The {@link
* java.lang.reflect.Constructor#newInstance(java.lang.Object...)
* Constructor.newInstance} method avoids this problem by wrapping
* any exception thrown by the constructor in a (checked) {@link
* java.lang.reflect.InvocationTargetException}.
*
* <p>The call
*
* <pre>{@code
* clazz.newInstance()
* }</pre>
*
* can be replaced by
*
* <pre>{@code
* clazz.getDeclaredConstructor().newInstance()
* }</pre>