Abstract Class Vs Interface Java 8

Jdk 8 brings arguably the abstract classs greatest advantage over the interface to the interface. An abstract class is a class that is declared abstract it may or may not include abstract methodsabstract classes cannot be instantiated but they can be subclassed. An abstract class has protected and public abstract methods.
abstract class vs interface java 8

In an abstract interface keyword is optional for declaring a method as an abstract.

Abstract class vs interface java 8. Variables declared in a java interface are by default final. An interface can have only public abstract methods. Abstract class can define constructor. The implication of this is that a large number of abstract classes used today can likely be.

They are more structured and can have a state associated with them. If you are designing api then use interface and if you are abstracting both state and behavior then use an abstract class. The key difference is that abstract class can maintain state but the interface cannot and an abstract class can also have a constructor which is not allowed inside interface even in java 8. Abstract class and interface both cant be instantiated.

In an interface keyword abstract is optional to declare a method as an abstract. From java 8 it can have default and static methods also. Simply abstract class achieves partial abstraction 0 to 100 whereas interface achieves fully abstraction 100. Note that from java 8 onwards we can create default and static methods in interface that contains the method implementations.

However they are still different concept in java 8. But there are many differences between abstract class and interface that are given below. Both abstract class and interface are used for abstraction. After introducing default method it seems that interfaces and abstract classes are same.

Abstract classes can have methods with implementation whereas interface provides absolute abstraction and cant have any method implementations. An interface can have only abstract methods. Abstract class vs interface. An abstract class may contain non final variables.

Interface can have only abstract methods. An abstract class can have both abstract and concrete methods. Example of abstract class and interface in java. Abstract class can have abstract and non abstract methods.

In abstract class keyword abstract is mandatory to declare a method as an abstract. In an abstract class the abstract keyword is compulsory for declaring a method as an abstract.