abstration and abstract class

Don’t get confused with Abstraction and abstract class both are different.

Abstraction: One among the four types of OOPS concept. It means hiding the complexity of an object by means of composition(sub-dividing) and aggregation(joining). Abstraction is known as Has-A relation e.g. Student has a name, student has a pen, car has one engine i.e. everyone is having Has-A relation.

Suppose we have a class Student ,so when we make a program using Has-A relation we will make other classes like address, pen, name (composition i.e. sub dividing its parts ) and then in Student will make an object of each class and will access student features and also its own features , thus removing complexity and hence no confusion will be there.

Abstract class: Abstract means what you feel but u dont know what to say. e.g. u are making an application for game and you want your player to kick in game whenever you press 5 button so u will make a method named as kick but the thing is u dntknw what to write a code so u just make a method unimplemented and will declare it or implement it in other class and hence the class having unimplemented methods is written as abstract.REMEMBER: Abstract class can have both implemented and no-implemented methods and we cannot make an object of abstract class