Can Somebody tell me that how can i use "abstract" with OOP concept in JAVA??Can give any examples??? eg.if i'm straight forward using the variables from the database,then how can i still using the "abstract" concept?? Examples plz....

Hi! The keywork abstract is to define a class or methods within a class that has no implementation. This is used for inheritance where the abstract method or class have to be implemted when inherited. A classical example of inheritance is the shape class. The shape is an abstract entitity, a shape is just a shape. but all shapes have common attributes, such as a center, the abillity to be rotated, the area, etc. All shapes define this operations differently , hence they need different implementations. e.g. a circle calculates it's area differently than a square. This is where abstract comes in. If a method is defined abstract in the base class it has to be redefined, in it's childclasses. Not sure what you mean by using variable from a database.. /Marcus