JAVA OVERRIDING AND OVERLOADING QUIZ

What will be printed after executing following program code?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.println(b.getValue());}}

30

40

None of these

10

20

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____________ method cannot be overridden.

final

static

None of these

private

super

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What will be the output of the following program code?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)); }}

Will compile and run printing out 20

Runtime error

Will compile and run printing out 25

Will not compile.

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What will be the output?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); }}

Value-A 10

Value-A 11

None of these

Value-B 10

Value-B 11

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What is the output for the below code ?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(); }}

Name-B

None of these

Value-A

Value-A Name-B

Compilation fails - private methods can't be override

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What is output of the program?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)); }}

None of these

9.0 9.0

Compilation Error

9 9

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Determine output: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. }

Value-A Name-B

Value-A Value-A

Name-B Name-C

None of these

Value-A Name-C

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What will be the output?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();}}

Nothing will be printed

Class Two method1

Class One method1

Compilation Error

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What will be the output?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();}}

None of these

Class B method

Class A method

Runtime Error

Compilation Error

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what is the result of the following piece of code:public class Person{ public void talk(){ System.out.print("I am a Person"); }}public class Student extends Person{ public void talk(){ System.out.print("I am a Student"); }}public class Test{ public static void main(String args[]){ Person p = new Student(); p.talk(); }}

I am a Student I am a Person

I am a Student

I am a Person I am a Student

I am a Person

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