Differences between abstract class and interface in Java

In Java, abstraction is achieved using Abstract classes and interfaces. Both contains abstract methods which a child class or implementing class has to implement. Following are the important differences between abstract class and an interface.

Example of Abstract Class vs Interface

public class JavaTester {
   public static void main(String args[]) {
      Animal tiger = new Tiger();
      tiger.eat();
      Cat lion = new Lion();
      lion.eat();
   }
}
interface Animal {
   public void eat();
}
class Tiger implements Animal {
   public void eat(){
      System.out.println("Tiger eats");
   }
}
abstract class Cat {
   abstract public void eat();
}
class Lion extends Cat{
   public void eat(){
      System.out.println("Lion eats");
   }
}

Output

Tiger eats
Lion eats