Question 1

What is the output for the below code? <pre class="prettyprint"> public class Test{ public static void printValue(int i, int j, int k){ System.out.println("int"); } public static void printValue(byte...b){ System.out.println("long"); } public static void main(String... args){ byte b = 9; printValue(b,b,b); } } </pre>

A. long B. int C. Compilation fails D. Compilation clean but throws RuntimeException

Question 2

What is the output for the below code ? <pre class="prettyprint"> class A{ private void printName(){ System.out.println("Value-A"); } } class B extends A{ public void printName(){ System.out.println("Name-B"); } } public class Test{ public static void main (String[] args){ B b = new B(); b.printName(); } } </pre>

A. Value-A B. Name-B C. Value-A Name-B D. Compilation fails - private methods can't be override

Question 3

Determine output: <pre class="prettyprint"> class A{ public void printValue(){ System.out.println("Value-A"); } } class B extends A{ public void printNameB(){ System.out.println("Name-B"); } } class C extends A{ public void printNameC(){ 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. newPrint(b); 6. newPrint(c); 7. } 8. public static void newPrint(A a){ 9. a.printValue(); 10. } 11. } </xmp></pre>

A. Value-A Name-B B. Value-A Value-A C. Value-A Name-C D. Name-B Name-C

Question 4

What will be the output? <pre class="prettyprint"> interface A{ public void method1(); } class One implements A{ public void method1(){ System.out.println("Class One method1"); } } class Two extends One{ public void method1(){ System.out.println("Class Two method1"); } } public class Test extends Two{ public static void main(String[] args){ A a = new Two(); a.method1(); } } </pre>

A. Class One method1 B. Class Two method1 C. Nothing will be printed D. Compilation Error

Question 5

What will be the output of the following program code? <pre class="prettyprint"><xmp> class Rectangle{ public int area(int length, int width){ return length*width; } } class Square extends Rectangle{ public int area(long length, long width){ return (int) Math.pow(length, 2); } } public class Test{ public static void main(String args[]){ Square r = new Square(); System.out.println(r.area(5 , 4)); } } </xmp> </pre>

A. Will not compile. B. Will compile and run printing out 20 C. Runtime error D. Will compile and run printing out 25

Question 6

____________ method cannot be overridden.

A. super B. static C. final D. private

Question 7

What will be the output? <pre class="prettyprint"> class A{ int i = 10; public void printValue(){ System.out.print("Value-A"); } } class B extends A{ int i = 12; public void printValue(){ System.out.print("Value-B"); } } public class Test{ public static void main(String args[]){ A a = new B(); a.printValue(); System.out.print(a.i); } } </pre>

A. Value-B 11 B. Value-B 10 C. Value-A 10 D. Value-A 11

Question 8

What is output of the program? <pre class="prettyprint"> class Test{ public void display(int x, double y){ System.out.println(x+y); } public double display(int p, double q){ return (p+q); } public static void main(String args[]){ Test test = new Test(); test.display(4, 5.0); System.out.println(test.display(4, 5.0)); } } </pre>

A. 9.0 9.0 B. 9 9 C. Compilation Error D. None of these

Question 9

What will be printed after executing following program code? <pre class="prettyprint"> class Base{ int value = 0; Base(){ addValue(); } void addValue(){ value += 10; } int getValue(){ return value; } } class Derived extends Base{ Derived(){ addValue(); } void addValue(){ value += 20; } } public class Test{ public static void main(String[] args){ Base b = new Derived(); System.out.pr

A. 10 B. 20 C. 30 D. 40

Question 10

What will be the output? <pre class="prettyprint"> class A{ static void method(){ System.out.println("Class A method"); } } class B extends A{ static void method(){ System.out.println("Class B method"); } } public class Test{ public static void main(String args[]){ A a = new B(); a.method(); } } </pre>

A. Class A method B. Class B method C. Compilation Error D. Runtime Error

Overriding and Overloading in Java