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 "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 ANSWER DOWNLOAD EXAMIANS APP
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(); }} Compile time error Compiles successfully and print None of This Compiles successfully and print Run Time error Compile time error Compiles successfully and print None of This Compiles successfully and print Run Time error ANSWER DOWNLOAD EXAMIANS APP
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(); }} "carcar" is printed. "vehiclebike" is printed. Compilation fails. "vehiclecar" is printed. ClassCastException exception is thrown at runtime. "carcar" is printed. "vehiclebike" is printed. Compilation fails. "vehiclecar" is printed. ClassCastException exception is thrown at runtime. ANSWER DOWNLOAD EXAMIANS APP
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(); }} c The code runs without output.. c b a a b c a c The code runs without output.. c b a a b c a ANSWER DOWNLOAD EXAMIANS APP
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 3 and 4 2 and 4 1 and 2 2 and 5 3 and 5 3 and 4 2 and 4 1 and 2 2 and 5 ANSWER DOWNLOAD EXAMIANS APP
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. } Compilation fails due to an error on lines 5 Compilation fails due to an error on lines 9 None of these Name B Name C Compilation fails due to an error on lines 5 Compilation fails due to an error on lines 9 None of these Name B Name C ANSWER DOWNLOAD EXAMIANS APP
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