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.

"vehiclebike" is printed.

"vehiclecar" is printed.

Compilation fails.

"carcar" is printed.

ClassCastException exception is thrown at runtime.

"vehiclebike" is printed.

"vehiclecar" is printed.

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JAVA Inheritence
Which is true?

"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

"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

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JAVA Inheritence
What will be the output?class One{ final int a = 15;}class Two extends One{ final int a = 20;}public class Test extends Two{ final int a = 30; public static void main(String args[]){ Test t = new One(); System.out.print(t.a); }}

15

20

None of these

Compiler Error

30

15

20

None of these

Compiler Error

30

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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(); }}

a

The code runs without output..

c

a b c

c b a

a

The code runs without output..

c

a b c

c b a

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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[])

Overridden: hello (String, Integer[])

Compilation fails

None of these

hello (String, Integer[])

Overridden: hello (String, Integer[])

Compilation fails

None of these

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JAVA Inheritence
The concept of multiple inheritance is implemented in Java byI. Extending two or more classes.II. Extending one class and implementing one or more interfaces.III. Implementing two or more interfaces.

Only (II)

Only (I)

(I) and (II)

(II) and (III)

Only (III)

Only (II)

Only (I)

(I) and (II)

(II) and (III)

Only (III)

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JAVA Inheritence

JAVA Inheritence Which is true?

JAVA Inheritence What will be the output?class One{ final int a = 15;}class Two extends One{ final int a = 20;}public class Test extends Two{ final int a = 30; public static void main(String args[]){ Test t = new One(); System.out.print(t.a); }}

JAVA Inheritence The concept of multiple inheritance is implemented in Java byI. Extending two or more classes.II. Extending one class and implementing one or more interfaces.III. Implementing two or more interfaces.

JAVA Inheritence
Which is true?

JAVA Inheritence
What will be the output?class One{ final int a = 15;}class Two extends One{ final int a = 20;}public class Test extends Two{ final int a = 30; public static void main(String args[]){ Test t = new One(); System.out.print(t.a); }}

JAVA Inheritence
The concept of multiple inheritance is implemented in Java byI. Extending two or more classes.II. Extending one class and implementing one or more interfaces.III. Implementing two or more interfaces.