How to use function of an abstract class??

Hi all,
I want to use the format(object obj) function of the package java.text.Format. But as the Format class is an abstract class i could not instantiate it, so that i can call the format(object obj) method using the dot(.) operator.
I know what is an abstract class. i've studied and tried to understand. as everybody knows, studied the perfect example(because i've read it in all the abstract class tutorial, books) of the Shape class. But still i dont understand how am i going to use that format(object obj) method. Please help me..

Instead of using the abstract class Format use the
concrete classes DecimalFormat
SimpleDateFormat etc check java.text APIS
http://java.sun.com/j2se/1.4.2/docs/api
Hi!! Thanks both of you.
If Sun has a abstract class then there must be a
concrete class which extends that abstract class .It
is always better to check the APIWhat do you mean by this line. Is it true for all the abstract classes in the jdk?

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Hi,
refer the given below code.
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