When To Use Abstract Class Vs Interface

A good abstract class will reduce the amount of code that has to be rewritten because it s functionality or state can be shared. Variables declared in a java interface are by default final.

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An abstract class can have non abstract methods concrete methods while in case of interface all the methods has to be abstract.

When to use abstract class vs interface. An abstract class allows you to create functionality that subclasses can implement or override. Abstract class vs interface. A class can use multiple interface.

An abstract class is a class that is declared abstract it may or may not include abstract methods abstract classes cannot be instantiated but they can be subclassed. The interface has no defined information to be shared. Example of abstract class and interface in java.

Interface can have only abstract methods. An abstract class can declare or use any variables while an interface is not allowed to do so. If many implementations are of the same kind and use common behavior then it is superior to use abstract class.

Abstract class can contain methods fields constants etc. Abstract classes provide you the flexibility to have certain concrete methods and some other methods that the derived classes should implement. On the other hand if you use interfaces you would need to implement all the methods in the class that.

An abstract class can have shared state or functionality. But there are many differences between abstract class and interface that are given below. So following code will not compile.

A class can extend only one abstract class while a class can implement multiple interfaces. Simply abstract class achieves partial abstraction 0 to 100 whereas interface achieves fully abstraction 100. Both abstract class and interface are used for abstraction.

An interface is only a promise to provide the state or functionality. An abstract class may contain non final variables. An interface only allows you to define functionality not implement it.

An abstract class permits you to make functionality that subclasses can implement or override whereas an interface only permits you to state functionality but not to implement it. Abstract class and interface both can t be instantiated. It is used to implement peripheral abilities of class.

Sample code for interface and abstract class in java. When we have the requirement of a class that contains some common properties or methods with some common properties whose implementation is different for different classes in that situation it s better to use abstract class then interface. Abstract class can have abstract and non abstract methods.

If many implementations only share methods then it is superior to use interface. From java 8 it can have default and static methods also. A class can only use one abstract class.

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