Consider the following pseudo Java code. Which of these options is valid in Java

Question

Consider the following pseudo Java code. Which of these options is valid in Java?

class Vehicle { . . . }
class Car extends Vehicle { . . . }
class Boat extends Vehicle { . . . }
class AmphibiousVehicle extends Car, Boat { . . . }

interface Vehicle { . . . }
interface Car extends Vehicle { . . . }
interface Boat extends Vehicle { . . . }
interface AmphibiousVehicle extends Car, Boat { . . . }

class Vehicle { . . . }
abstract class Car extends Vehicle { . . . }
abstract class Boat extends Vehicle { . . . }
class AmphibiousVehicle extends Car, Boat { . . . }   

All of these above

None of these above

a.

class Vehicle { . . . }
class Car extends Vehicle { . . . }
class Boat extends Vehicle { . . . }
class AmphibiousVehicle extends Car, Boat { . . . }

b.

interface Vehicle { . . . }
interface Car extends Vehicle { . . . }
interface Boat extends Vehicle { . . . }
interface AmphibiousVehicle extends Car, Boat { . . . }

c.

class Vehicle { . . . }
abstract class Car extends Vehicle { . . . }
abstract class Boat extends Vehicle { . . . }
class AmphibiousVehicle extends Car, Boat { . . . }   

d.

All of these above

e.

None of these above

Explanation / Answer

a)   class Vehicle { }
b)   class Car extends Vehicle { }
c)   class Boat extends Vehicle { }
d)   class AmphibiousVehicle extends Car, Boat {}

a,b,c single inheritance but d is multiple inheritance.multiple inheritance not possible in java so it is not valid.

a) interface Vehicle { . . . }

     it is an interface so it is valid.

b) interface Car extends Vehicle { . . . }

    an interface can inherit another interface so it is valid.

c) interface Boat extends Vehicle { . . . }

   an interface can inherit another interface so it is valid.

d) interface AmphibiousVehicle extends Car, Boat { . . . }

    in java an interface can inherite any no of interfaceses so it is also valid.

all a,b,c,d is valid so it is valid option

a) class Vehicle { . . . }

it is just a class so it is valid

b) abstract class Car extends Vehicle { . . . }

an abstract class can extends a normal class. so it is also valid

c)abstract class Boat extends Vehicle { . . . }

an abstract class can extends a normal class. so it is also valid

d)class AmphibiousVehicle extends Car, Boat { . . . }

here a class extends two class to acheive multiple inheritance.multiple inheritance not possible in java so it is not valid.

so this option is not valid.

so only option b is valid

a)   class Vehicle { }
b)   class Car extends Vehicle { }
c)   class Boat extends Vehicle { }
d)   class AmphibiousVehicle extends Car, Boat {}

a,b,c single inheritance but d is multiple inheritance.multiple inheritance not possible in java so it is not valid.

a) interface Vehicle { . . . }

     it is an interface so it is valid.

b) interface Car extends Vehicle { . . . }

    an interface can inherit another interface so it is valid.

c) interface Boat extends Vehicle { . . . }

   an interface can inherit another interface so it is valid.

d) interface AmphibiousVehicle extends Car, Boat { . . . }

    in java an interface can inherite any no of interfaceses so it is also valid.

all a,b,c,d is valid so it is valid option

a) class Vehicle { . . . }

it is just a class so it is valid

b) abstract class Car extends Vehicle { . . . }

an abstract class can extends a normal class. so it is also valid

c)abstract class Boat extends Vehicle { . . . }

an abstract class can extends a normal class. so it is also valid

d)class AmphibiousVehicle extends Car, Boat { . . . }

here a class extends two class to acheive multiple inheritance.multiple inheritance not possible in java so it is not valid.

so this option is not valid.

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