Defference between new & Class.newInstance()

[ajagania]

Hi All,

I would like to know about what is the difference between \"new\" keyword and Class.newInstance().

Any pointers will be greatly appreciated.

Thanks & Regards,

Anant.

Low aim is a crime......

[mahens]

When u use the new operator to create an instance of a class, u cant change the class which is been instatiated. In other words, the class which is instantiated is determined at compile time.


If u use class.newInstance(), then u can change the class which is been instatiated at runtime. In other words for example,

Class c = Class.forName("Some class Name");

Object o = c.newInstance();

Here, u can change the String argument in the class.forName() method and change the class which is getting instatiated. Say u got this String from a property file, then u dont even have to compile the class in order to get another different class instatiated.

whe u use Object o = new SomeObject(), u cant change the class which is getting instatiated without changing and recompiling again

Hope u get my point.

Ask if u have any further queries relating to this

Regards

Mahen
BSc Eng (Comp Sci and Eng), SCJP 1.4