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(); } }

123
12
321
23

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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 C method2 Class C method3
None of these
Compilation Error
Runtime exception
Class B method2 Class C method3

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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 for all combinations of X and Y being classes and/or interfaces
"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 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(); }}

"vehiclebike" is printed.
ClassCastException exception is thrown at runtime.
"carcar" is printed.
"vehiclecar" is printed.
Compilation fails.

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