What will be the result of compiling and executing the following program code?class Vehicle{ public void printSound(){ System.out.print("vehicle"); }}class Car extends Vehicle{ public void printSound(){ System.out.print("car"); }}class Bike extends Vehicle{ public void printSound(){ System.out.print("bike"); }}public class Test{ public static void main(String[] args){ Vehicle v = new Car(); Bike b = (Bike) v; v.printSound(); b.printSound(); }}

JAVA Inheritence
What will be the result of compiling and executing the following program code?class Vehicle{ public void printSound(){ System.out.print("vehicle"); }}class Car extends Vehicle{ public void printSound(){ System.out.print("car"); }}class Bike extends Vehicle{ public void printSound(){ System.out.print("bike"); }}public class Test{ public static void main(String[] args){ Vehicle v = new Car(); Bike b = (Bike) v; v.printSound(); b.printSound(); }}

Compilation fails.

"carcar" is printed.

ClassCastException exception is thrown at runtime.

"vehiclecar" is printed.

"vehiclebike" is printed.

Compilation fails.

"carcar" is printed.

ClassCastException exception is thrown at runtime.

"vehiclecar" is printed.

"vehiclebike" is printed.

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JAVA Inheritence
Which is true?

"X extends Y" is correct if and only if X is a class and Y is an interface

"X extends Y" is correct if X and Y are either both classes or both interfaces

"X extends Y" is correct if and only if X is an interface and Y is a class

"X extends Y" is correct for all combinations of X and Y being classes and/or interfaces

"X extends Y" is correct if and only if X is a class and Y is an interface

"X extends Y" is correct if X and Y are either both classes or both interfaces

"X extends Y" is correct if and only if X is an interface and Y is a class

"X extends Y" is correct for all combinations of X and Y being classes and/or interfaces

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JAVA Inheritence
What will be the result after compiling this code?class SuperClass{ public int doIt(String str, Integer... data)throws Exception{ String signature = "(String, Integer[])"; System.out.println(str + " " + signature); return 1; }}public class Test extends SuperClass{ public int doIt(String str, Integer... data){ String signature = "(String, Integer[])"; System.out.println("Overridden: " + str + " " +signature); return 0; } public static void main(String... args){ SuperClass sb = new Test(); sb.doIt("hello", 3); }}

hello (String, Integer[])

None of these

Compilation fails

Overridden: hello (String, Integer[])

hello (String, Integer[])

None of these

Compilation fails

Overridden: hello (String, Integer[])

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JAVA Inheritence
Determine output:class A{public void method1(){System.out.print("Class A method1");}}class B extends A{public void method2(){System.out.print("Class B method2");}}class C extends B{public void method2(){System.out.print("Class C method2");}public void method3(){System.out.print("Class C method3");}}public class Test{public static void main(String args[]){A a = new A();C c = new C();c.method2();a = c;a.method3();}}

Class B method2 Class C method3

Class C method2 Class C method3

Compilation Error

None of these

Runtime exception

Class B method2 Class C method3

Class C method2 Class C method3

Compilation Error

None of these

Runtime exception

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JAVA Inheritence
Which of the following is true?1. A class can extend more than one class.2. A class can extend only one class but many interfaces.3. An interface can extend many interfaces.4. An interface can implement many interfaces.5. A class can extend one class and implement many interfaces.

3 and 4

1 and 2

3 and 5

2 and 4

2 and 5

3 and 4

1 and 2

3 and 5

2 and 4

2 and 5

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JAVA Inheritence
Determine output:class Small{ public Small(){ System.out.print("a "); }}class Small2 extends Small{ public Small2(){ System.out.print("b "); }}class Small3 extends Small2{ public Small3(){ System.out.print("c "); }}public class Test{ public static void main(String args[]){ new Small3(); }}

The code runs without output..

a b c

a

c b a

c

The code runs without output..

a b c

a

c b a

c

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JAVA Inheritence

JAVA Inheritence Which is true?

JAVA Inheritence Which of the following is true?1. A class can extend more than one class.2. A class can extend only one class but many interfaces.3. An interface can extend many interfaces.4. An interface can implement many interfaces.5. A class can extend one class and implement many interfaces.

JAVA Inheritence
Which is true?

JAVA Inheritence
Which of the following is true?1. A class can extend more than one class.2. A class can extend only one class but many interfaces.3. An interface can extend many interfaces.4. An interface can implement many interfaces.5. A class can extend one class and implement many interfaces.