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); }}

None of these
Overridden: hello (String, Integer[])
Compilation fails
hello (String, Integer[])

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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); }}

prints "Horse eats hay"
prints "Cattle eats hay"
None of these
prints "Mammal eats food"
Class cast Exception at runtime.

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JAVA Inheritence
What will be the output?class Parent{ public void method(){ System.out.println("Hi i am parent"); }}public class Child extends Parent{ protected void method(){ System.out.println("Hi i am Child"); } public static void main(String args[]){ Child child = new Child(); child.method(); }}

Compiles successfully and print
Compiles successfully and print
None of This
Compile time error
Run Time error

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

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JAVA Inheritence
Which is true?

"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 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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