ABSTRACTION

Data Abstraction is the property by virtue of which only the essential details are displayed to the user.

abstraction is achieved by interfaces and abstract classes.

Interfaces --- it does not have any defined methods so we can not make objects of interface.

Classes implements interfaces  

example --

public interface car {

public boolean ispetrolcar();

public boolean enginetype();

}

class automobile implements car{

ispetrolcar(){

return true}

enginetype(){

return petrol;}

}