Difference between Abstract Class and Interface in Java

Following are the notable differences between interface and abstract class in Java.

Example

public class Tester {
   public static void main(String[] args) {

      Car car = new Car();
      car.setFuel();
      car.run();
      Truck truck = new Truck();
      truck.setFuel();
      truck.run();
   }
}
interface Vehicle {
   public void setFuel();
   public void run();
}
class Car implements Vehicle {
   public void setFuel() {
      System.out.println("Car: Tank is full.");
   }
   public void run() {
      System.out.println("Car: Running.");
   }
}
abstract class MotorVehicle {
   public void setFuel() {
      System.out.println("MotorVehicle: Tank is full.");
   }
   abstract public void run();
}
class Truck extends MotorVehicle {
   public void run() {
      System.out.println("Truck: Running.");
   }
}

Output

Car: Tank is full.
Car: Running.
MotorVehicle: Tank is full.
Truck: Running.