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Tip: Call a Private Constructor

Learn how to call a private constructor from outside its class.


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Calling a private constructor from outside its class can be done via Reflection as follows:

public final class Users {

   private Users() {}

  // static members
}

Class usersClass = Users.class;
Constructor emptyUsersCnstr = usersClass.getDeclaredConstructor();

emptyUsersCnstr.setAccessible(true);
Users usersViaEmptyCnstr = emptyUsersCnstr.newInstance();

 

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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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