Definition-
Abstraction is a concept of showing only functionality and hiding procedure.
In java, only name of method is given and not the body.
-Abtraction can be applied on classes and methods using abstract keyword.
– In abstraction we focus on “what” the object does instead of “how”.
1- abstract class
– Only abstract class can have abstract methods
-Abstract class can have normal methods too.
-Object of abstract class can’t be created directly
– abstract classes should be inherited to be useful
[Think of an abstract class as an almost complete car by your dad who left over the choice of engine to be provided by you.]
2- abstract method
– abstract method can’t have method body
– abstract methods should be overridden to be useful.
code samples are here
1- Abstraction
package abstraction14; abstract class A{ abstract void shw(); abstract void disp(); } public class ExampleAbstraction extends A { @Override void shw() { System.out.println("hi"); } @Override void disp() { System.out.println("bye"); } public static void main(String[] args) { ExampleAbstraction e1=new ExampleAbstraction(); e1.shw(); e1.disp(); } }
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