Know the definitions and usage of the following terms. 1. javadoc 17. polymorphi

Question

Know the definitions and usage of the following terms.

1. javadoc 17. polymorphism

2. javac 18. dynamic binding

3. java 19. shadowing

4. boxing/unboxing/autoboxing 20. data hiding

5. encapsulation 21. responsibility driven programming

6. inheritance 22. object's state and behavior

7. composition 23. overloading

8. chaining 24. override

9. exception handler 25. primitive variable

10. superclass 26. java.lang.Object

11. subclass 27. instantiation

12. static 28. reference variable

13. garbage 29. protected

14. stack 30. package

15. heap 31. this

16. null 32. declared type vs actual type

I'd like to get some info on these since I don't have much time to do research.

Explanation / Answer

Hi friend, Question is too long. As per the chegg guideline, please post only 4 parts of a problem.

I have answered first 4 Questions.

Please repost others in separate post.

Please rate my answer!!

1. javadoc 17. polymorphism
In object-oriented programming, polymorphism (from the Greek meaning "having multiple forms") is the characteristic of being able to assign a different meaning or usage to something in different contexts - specifically, to allow an entity such as a variable, a function, or an object to have more than one form. There are several different kinds of polymorphism.

Polymorphism is one of the important concepts of object-oriented programming language which means one thing or stuff has more than one forms is known as polymorphism.

example of Polymorphism is function overloading, function overriding etc.

let's discuss what is overriding and overloading.

basically, function overloading means more than one functions have the same name but different parameters define in

2. javac 18. dynamic binding

Dynamic Binding: In Dynamic binding compiler doesn’t decide the method to be called. Overriding is a perfect example of dynamic binding. In overriding both parent and child classes have same method . Let’s see by an example

public class NewClass
{
public static class superclass
{
void print()
{
System.out.println("print in superclass.");
}
}

public static class subclass extends superclass
{
@Override
void print()
{
System.out.println("print in subclass.");
}
}

public static void main(String[] args)
{
superclass A = new superclass();
superclass B = new subclass();
A.print();
B.print();
}
}

3. java 19. shadowing
Shadowing refers to the practice in Java programming of using two variables with the same name within scopes that overlap. When you do that, the variable with the higher-level scope is hidden because the variable with lower-level scope overrides it. The higher-level variable is then “shadowed.”

4.
Autoboxing: Converting a primitive value into an object of the corresponding wrapper class is called autoboxing. For example, converting int to Integer class. The Java compiler applies autoboxing when a primitive value is:

Passed as a parameter to a method that expects an object of the corresponding
wrapper class.
Assigned to a variable of the corresponding wrapper class.

Unboxing: Converting an object of a wrapper type to its corresponding primitive value is called unboxing. For example conversion of Integer to int. The Java compiler applies unboxing when an object of a wrapper class is:

Passed as a parameter to a method that expects a value of the corresponding primitive type.
Assigned to a variable of the corresponding primitive type.

// Java program to illustrate the concept
// of Autoboxing and Unboxing
import java.io.*;

class GFG
{
public static void main (String[] args)
{
// creating an Integer Object
// with value 10.
Integer i = new Integer(10);

// unboxing the Object
int i1 = i;

System.out.println("Value of i: " + i);
System.out.println("Value of i1: " + i1);

//Autoboxing of char
Character gfg = 'a';

// Auto-unboxing of Character
char ch = gfg;
System.out.println("Value of ch: " + ch);
System.out.println("Value of gfg: " + gfg);

}
}

Related Questions

Navigate

• Browse (All)
• Browse K
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.