DIFFERENT ways to create an OBJECT in JAVA || Part 3 || Using Constructor.newInstance()

This tutorial covers how to create an object using newInstance() of Constructor class. we will also learn what are the differences between the Class class newInstance() and the Constructor class newInstance() ?

As we are discussing about different ways to create object in java , and we already covered
how to create an using new keyword
creating object using class.forname in java (using newInstance method of Class

so this is going to be our third way to create an object in java.

The various difference between the Class class newInstance() and the Constructor class newInstance() are
class.newInstance() always look for the no args constructor but the Constructor.newInstance() can invoke any kind of Constructor regardless the parameter.
class.newInstance() requires the constructor to be visible but the Constructor.newInstance() can also invoke the private constructor in certain circumstances.
class.newInstance() throws all the exception that your constructor throws to you but Constructor.newInstance() always wraps all the exceptions thrown by your constructor to an single exception called InvoationTargetException.

The Constructor class newInstance() used widely across lot of frameworks like Spring,Hibernate,Struts and etc.

When we call Class class newInstance() it internally calls the Constructor class newInstance( ) to create an object.

both the newInstance() called as reflective ways to create an object in java so lets talk more about java reflection in this tutorial.


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