JAVA Overriding and Overloading
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
None of these
40
20
10

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JAVA Overriding and Overloading
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 Person
I am a Person I am a Student
I am a Student
I am a Student I am a Person

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JAVA Overriding and Overloading
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(); }}

None of these
Name-B
Value-A
Value-A Name-B
Compilation fails - private methods can't be override

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JAVA Overriding and Overloading
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 not compile.
Runtime error
Will compile and run printing out 25
Will compile and run printing out 20

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