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Tip: Avoid Poor Use of Reflection

Learn more about why it is dangerous to create an instance of a class you don't know.


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Class beanClass = ???
If (beanClass.newInstance() instanceof TestBean) ???

The above code is tries to use the reflection API and tries to find a way to check for inheritance, but it didn't find a way to do it. So it just created a new instance and uses the instanceof operator. It is dangerous to create an instance of a class you don't know. You never know what this class does, it could be very costly or the default constructor may not even exist. The right way to do this check is to use the Class.isAssignableFrom(Class) method:

Class beanClass = ???
If (TestBean.class.isAssignableFrom(beanClass)) ???

 

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Octavia Andreea Anghel is a senior PHP developer currently working as a primary trainer for programming teams that participate at national and international software-development contests. She consults on developing educational projects at a national level. She is a coauthor of the book "XML Technologies--XML in Java" (Albastra, ISBN 978-973-650-210-1), for which she wrote the XML portions. In addition to PHP and XML, she's interested in software architecture, web services, UML, and high-performance unit tests.
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