JAVA Inheritence Which is true? "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 "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 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(); }} ClassCastException exception is thrown at runtime. "carcar" is printed. "vehiclebike" is printed. "vehiclecar" is printed. Compilation fails. ClassCastException exception is thrown at runtime. "carcar" is printed. "vehiclebike" is printed. "vehiclecar" is printed. Compilation fails. ANSWER DOWNLOAD EXAMIANS APP
JAVA Inheritence What will be the output?class One{ final int a = 15;}class Two extends One{ final int a = 20;}public class Test extends Two{ final int a = 30; public static void main(String args[]){ Test t = new One(); System.out.print(t.a); }} 20 Compiler Error 30 None of these 15 20 Compiler Error 30 None of these 15 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 None of This Compiles successfully and print Compiles successfully and print Run Time error Compile time error None of This Compiles successfully and print Compiles successfully and print Run Time error 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); }} Overridden: hello (String, Integer[]) hello (String, Integer[]) Compilation fails None of these Overridden: hello (String, Integer[]) hello (String, Integer[]) Compilation fails None of these 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); }} prints "Mammal eats food" None of these prints "Cattle eats hay" Class cast Exception at runtime. prints "Horse eats hay" prints "Mammal eats food" None of these prints "Cattle eats hay" Class cast Exception at runtime. prints "Horse eats hay" ANSWER DOWNLOAD EXAMIANS APP
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