how the abstraction is done,can any body give wt a example?

Abstraction is a purposeful way to inherit multiple inheritance...It helps us to define only the method prototypes in the abstraction class..(The corresponding method is called "Abstraction Method"
E.G.

Abstract class test
{
Abstract function1([set of arguments]);
..................
.....................
}
Here we can define another class to implement the methods defined in the abstraction class,
The syntax is:
public class t1 implements test
{
Method definition and all...
}

Well,This is what I know..If anyone wants to convey his/her concepts,they are heartily welcome.....

Abstraction:
Hidding the unnecessary data from the users and provide only the necessary data.

Eg: Methods in java
(ie)The user able to see how the method has been declared and how it has been used in a class,but he doesn't know where it has been stored(in stack/heap) & in which memory address.

Thus it shows only the necessary data to run the prg & hides the remaining data from the user.

Hope tis brings u a clear idea!

Thanks