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); }}

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); }}

Overridden: hello (String, Integer[])

None of these

hello (String, Integer[])

Compilation fails

Overridden: hello (String, Integer[])

None of these

hello (String, Integer[])

Compilation fails

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JAVA Inheritence
Determine output:class A{ public void printName(){ System.out.println("Name-A"); }}class B extends A{ public void printName(){ System.out.println("Name-B"); }}class C extends A{ public void printName(){ System.out.println("Name-C"); }}1. public class Test{2. public static void main (String[] args){3. B b = new B();4. C c = new C();5. b = c;6. newPrint(b);7. }8. public static void newPrint(A a){9. a.printName();10. }11. }

Name B

None of these

Compilation fails due to an error on lines 9

Compilation fails due to an error on lines 5

Name C

Name B

None of these

Compilation fails due to an error on lines 9

Compilation fails due to an error on lines 5

Name C

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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 5

1 and 2

2 and 4

2 and 5

3 and 4

3 and 5

1 and 2

2 and 4

2 and 5

3 and 4

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JAVA Inheritence
What is the output of the following program code?abstract class C1{public C1(){ System.out.print(1); } } class C2 extends C1{ public C2(){ System.out.print(2); } } class C3 extends C2{ public C3(){ System.out.println(3); } } public class Test{ public static void main(String[] a){ new C3(); } }

23

12

123

321

23

12

123

321

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JAVA Inheritence
What is the result of compiling and running this program?class Mammal{ void eat(Mammal m){ System.out.println("Mammal eats food"); }}class Cattle extends Mammal{ void eat(Cattle c){ System.out.println("Cattle eats hay"); }}class Horse extends Cattle{ void eat(Horse h){ System.out.println("Horse eats hay"); }}public class Test{ public static void main(String[] args){ Mammal h = new Horse(); Cattle c = new Horse(); c.eat(h); }}

None of these

Class cast Exception at runtime.

prints "Mammal eats food"

prints "Cattle eats hay"

prints "Horse eats hay"

None of these

Class cast Exception at runtime.

prints "Mammal eats food"

prints "Cattle eats hay"

prints "Horse eats hay"

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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 an interface and Y is a class

"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 a class and Y is an interface

"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 an interface and Y is a class

"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 a class and Y is an interface

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JAVA Inheritence

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.

JAVA Inheritence
Which is true?