Method Overriding
Overriding
is another useful feature of object-oriented programming technique. It provide the
facility to redefine the inherit method of the super class by a subclass. The
method overriding is used to invoking the parent class method by a child class.
It is possible when a child class extends the parent class then all the
attributes and the methods of parent class inherit by child class. The methods
name and the parameters pass in the subclass are same as superclass methods. The
restriction of the access modifier of the subclass method should not more than
the superclass method e.g. if the superclass method is protected, the overriding
method may be protected or public.
Here is an example of the method overriding. Create a class "Override" and
create two subclasses "One" and "Two" and define a same
method in both of them. When the main class call the
method the method executes on behalf of their definition. In the given example we
are trying to illustrate the same technique.
Here is the Code of the Example :
"Override.java"
import java.lang.*;
class One {
int first = 100;
int func() { return first; }
}
class Two extends One {
int first = 200;
int func() { return -first; }
}
public class Override {
public static void main(String args[]) {
Two obj2 = new Two();
System.out.println(obj2.first);
System.out.println(obj2.func());
One obj1 = (One) obj2;
System.out.println(obj1.first);
System.out.println(obj1.func());
}
}
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Here is the Output of the Example :
C:\roseindia>javac Override.java
C:\roseindia>java Override
200
-200
100
-200
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Download This Example :
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