Answer / sridharan

We know method overriding will be coming in inheritance.
Consider a mother and her daughter.
Lets think mothers will cook, so her daughter will also
cook. One day mother cooked a biryani for her daughter. By
using the method

cookBriyani(rice,vegetables,water,salt). {

// mother style of cooking
}
But her daughter didn’t like it. So her daughter decided to
prepare biryani by herself. She is also going to use same
ingredients but she is going to prepare in her style.
Daughter method is

cookBriyani(rice,vegetables,water,salt){
// daughter style of cookling
}
Daughter made also biryani so without changing the
name i.e cookBriyani(), also she used same ingredients (i.e
rice,vegetables,water,salt) i.e same parameter but she
prepared in different style.

Answer / sadikhasan palsaniya

we can change default behavior of super class method by
overriding that method into the subclass.

Answer / ershad md sk

Bcoz......wen we think in Object Oriented Lang ..has u ask
if we create a new method we hav to call the method each
time wen we invoke the Object & it is a performance ISSUE
it wil eat lot of memory & it is a COMPLEXITY
Issue ........if u override Using the superclass Handle we
can create any instance which is of any type(int Float
Long Short)it wil save space and reduce COMPLEXITY and
increase PERFORMANCE...

Answer / sathish kumar

using this concept we can call base class function
repeatedly in subclass only change of inner coding in
subclass each and very subclass overrides baseclass when
they r called

Answer / kv

The answer lies in Object Oriented concept. When you are
overriding a method, you overriding the internal details of
default behavior. But your interface to external world is
not changed. Example, Base class employee has a method
commuteToWork(). All the manager in the company has given
the company car and a driver. Their implementation of
commuteToWork will be different from the non manager
employees. If you add a new method saying
commuteToWorkByCar(), every Monday morning you would need to
call different method for each subtype of employee. Hope it
will help.

Answer / kino

Unlike data fields, method names can be duplicated. This is
an important feature that allows method overriding, which
in turn facilitates polymorphism in the design of object-
oriented programs. Method overriding allows a subclass to
provide its own implementation of a method already provided
by one of its superclasses. When a method is called on an
object, IDL searches for a method of that class with that
name. If found, the method is called. If not, the methods
of any inherited object classes are examined in the order
their INHERITS specifiers appear in the structure
definition, and the first method found with the correct
name is called. If no method of the specified name is
found, an error occurs.

We can think of overriding as redefining. When we want to
redefine an inherited behaviour in a more specialised way,
we must provide implementation with the exact method
signature as the inherited method (that we want to
redefine).


For example:

If I define class A:
class A{
void m(){
}
}
We can be making objects from A like this:
A a = new A;
And we can call its method m like this:
a.m();

If we also define class B as a child of A like this:
class B extends A {
}
Then we know it inherits method m from its parent, class A

So we can do this:
B b = new B();
b.m();
The above works because m is inherited.

if u dont understand go through this link.
http://www.tgs.com/support/oiv-java-
release_notes/extension/guide_content.html

Answer / imambasha

hi
MethodOverriding is the concept which implements Dynamic
Code(Method) binding.
i.e., The method which is going to bind or execute is
decided at the runtime basing on the Object that we are
using to call that method...
Suppose assume we have two Classes A,B Where class B is
inheriting class A.And even we have overridden(given
different implementation with same method signature)a
method of class A in class B.
Now the criteria is which method(superclass method or
subclsas overridden method) is to be called or executed is
determined based on the object(class A object Or class B
object) we are using to call that method............

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The following program reads data (details of students) from a file named students.txt and converts it into e-mail addresses. The results are written to a file named studentemail.txt. students.txt consists of a number of lines, each containing the data of a student in colon delimited format: Last Name:First Name:Student Number Each input record is converted to an e-mail address and written to studentemail.txt in the following format: the first character of the last name + the first character of the first name + the last four digits of the student number + “@myunisa.ac.za” import java.io.*; public class EmailConverter { public static void main(String[] args) throws IOException { BufferedReader input = new BufferedReader(new FileReader ("students.txt")); PrintWriter output = new PrintWriter(new FileWriter ("studentemail.txt")); String line = input.readLine(); while (line != null) { // Extract the information for each student String[] items = line.split(":"); // Generate the email address String email = "" + items[0].charAt(0) + items[1].charAt(0) + items[2].substring(4,8) + "@myunisa.ac.za"; email = email.toLowerCase(); // Output output.println(email); line = input.readLine(); } input.close(); output.close(); } } Rewrite the class so that it handles possible errors that may occur. In particular, it should do the following: • It should catch at least three appropriate exceptions that might occur, and display suitable messages. • At this stage, the program will not run correctly if there is an empty line in the input file. Change the program so that if an empty line is encountered, an exception is thrown and the empty line is ignored. This exception should be handled with the display of a suitable error message. • Before the e-mail address is added to the output file, check if the student number has 8 digits. If not, throw an InvalidFormatException (which the program should not handle itself)

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