1. What is method overriding in OOP or Java?

1. How many types are of polymorphism in java?

1. Explain the difference between method overloading and method overriding.

1. How to achieve abstraction in Java.

1. Why Final keyword is used in Java. Explain with example.

Practical:

1. Write a Java code to illustrate the concept of run-time polymorphism and generate the appropriate output.

1. Write a Java code to illustrate the concepts of compile-time polymorphism.

3. Write a program to use abstract class and abstract method in Java.

Complete the missing programming steps:

1. Point out the error(s) and how they can be fixed in the following code:

public class B extends A {

private int a = 222;

public static void main(String[] args) {

System.out.println("in main(): ");

System.out.println("a = "+a);

a = 123;

}

}

public class A {

private int a = 100;

public void setA( int value) {

a = value;

}

public int getA() {

return a;

}

} //class A

2. Point out the error(s) and how they can be fixed in the following code:

public class OOPExercises {

public static void main(String[] args) {

A objA = new A( );

double result;

result = objA.getA( );

System.out.println("objA.a = "+ result);

}

}

public class A {

private int a = 100;

public void setA( int value) {

a = value;

}

public int getA() {

return a;

}

} //class A

3.Show the output of the code below:

public class OOPExercises {

static int a = 555;

public static void main(String[] args) {

A objA = new A();

B objB1 = new B();

A objB2 = new B();

C objC1 = new C();

B objC2 = new C();

A objC3 = new C();

objA.display();

objB1.display();

objB2.display();

objC1.display();

objC2.display();

objC3.display(); }

} Output:

public class A {

int a = 100;

public void display() {

System.out.printf("a in A = %d ", a);

}

} //class A

public class B extends A{

private int a = 123;

public void display() {

System.out.printf("a in B = %d ", a);

}

} //class B

public class C extends B {

private int a = 543;

public void display() {

System.out.printf("a in C = %d ", a);

}

} //class C