Why can't an abstract class extend an interface?

Question

I was just wondering why an abstract class can't extend an interface.

Since we can't instantiate an abstract class, can't I just extend the interface and then override those methods in the classes which are extending the abstract class?

For example

abstract class AbstractClass extends InterfaceA 
{

}

interface InterfaceA
{
   public void methodToBeImplemented();
}

class MyClass extends AbstractClass
{
  @Override
  public void methodToBeImplemented(){
      //do something
  }
}  

Answer 1

Because you don't extends an interface - you implements it.

interface InterfaceA
{
   public void methodToBeImplemented();
}

abstract class AbstractClass implements InterfaceA 
{

}

class MyClass extends AbstractClass
{
  @Override
  public void methodToBeImplemented(){
      //do something
  }
}  

An abstract class is still a class, just like any other. Only interfaces can extends other interfaces.

Answer 2

in interface extends only interface .when we use a interface in a class then it need to implements in class.and another thing is abstract class contain a both abstract and non abstract method while interface contain only abstract method that are define where implementation of inteface(subclass).