Question

Please help with these java questions

1. What is output?

public abstract class Vehicle {
   public abstract void move(int miles);
   public void printInfo(){
      System.out.print("Vehicle ");
   }
}
public class Car extends Vehicle {
   private int distance;
   public void move(int miles) {
      distance = distance + miles;
   }
   public void printInfo() {
      System.out.print("Car ");
   }
   public static void main(String args[]) {
      Vehicle myVehicle;
      Car myCar;
      myVehicle = new Vehicle();
      myCar = new Car();
      myVehicle.printInfo();
      myCar.printInfo();
   }
}

A. Error: Vehicle is abstract and cannot be instantiated B. Vehicle

C. Error: Car is not abstract and does not override abstract method move() D. Vehicle Car

2. A(n) ___ provides abstract methods and no other code.

A. polymorphic class

B. abstract class

C. interface

D. base class

3. Which class definition requires Square to follow the API of Shape?

A. public class Shape implements Square

B. public interface Shape

C. public class Square implements Shape

D. public class Square extends Shape

4. Which is true?

A. A class can implement multiple interfaces

B. An interface can implement multiple classes

C. A class can implement only one interface

D. A class can inherit from multiple classes

Answer 1

1)  A. Error: Vehicle is abstract and cannot be instantiated
2)  C. interface
3)  C. public class Square implements Shape
4)  A. A class can implement multiple interfaces