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(); } }

12
23
123
321

ANSWER DOWNLOAD EXAMIANS APP

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
prints "Cattle eats hay"
prints "Mammal eats food"
prints "Horse eats hay"
Class cast Exception at runtime.

ANSWER DOWNLOAD EXAMIANS APP

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[])

ANSWER DOWNLOAD EXAMIANS APP

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

ANSWER DOWNLOAD EXAMIANS APP

JAVA Inheritence
What is the result of compiling and running the following code?class Base{ public Base(){ System.out.print("Base"); }}public class Derived extends Base{ public Derived(){ this("Examveda"); System.out.print("Derived"); } public Derived(String s){ System.out.print(s); } public static void main(String[] args){ new Derived(); }}

Compilation Error
BaseExamiansDerived
ExamiansDerived
ExamiansBaseDerived
ExamiansDerivedBase

ANSWER DOWNLOAD EXAMIANS APP
MORE MCQ ON JAVA Inheritence