Abstraction
Data abstraction is a technique which provides only the required data to be visible or accessible to outside world. For example, making a call on a mobile. the logic behind making the call is not visible to others but it provides an abstract details of just call button to outside world.
abstract keyword is used for classes and methods.
- An abstract class cant be used for creating instances. In order to access, it must be inherited from other class. It can have both normal and abstract methods.
- An abstract method doesn't have body and it must be used inside an abstract class.
abstract class Mobiles { // abstract class
public abstract void features(); // abstract method
public void inbuiltFeatures() {
System.out.println("Voice and video calling");
System.out.println("Dual Camera");
}
}
class iPhone extends Mobiles {
public void features() {
System.out.println("Model : iPhone 11");
System.out.println("Capacity : 256 GB");
System.out.println("Liquid retina HD Display of 6.1 inches.");
System.out.println("Dual 12MP Ultra Wide and Wide cameras"); }
}
class Mobile {
public static void main(String[] args) {
iPhone myMobile = new iPhone();
myMobile.features();
myMobile.inbuiltFeatures();
}
}