What is method overriding in OOP or Java? How many types are of polymorphism in java? Explain
Question:
- What is method overriding in OOP or Java?
- How many types are of polymorphism in java?
- Explain the difference between method overloading and method overriding.
- How to achieve abstraction in Java.
- Why Final keyword is used in Java. Explain with example.
Practical:
- Write a Java code to illustrate the concept of run-time polymorphism and generate the appropriate output.
- 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
Expert Answer:
1 Method Overriding in Java Method overriding is a feature of objectoriented programming that allows a subclass to provide a specific implementation of a method that is already provided by its supercl... View the full answer
Practicing Statistics Guided Investigations For The Second Course
ISBN: 9780321586018
1st Edition
Authors: Shonda Kuiper, Jeff Sklar
