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| java |
Expert:dharmendar
object is the sub-class of the class(wht we define).object is the instance of a class.then how the class inherite the properties(state & behaviour) of a sub-class? |
| Answers |
Hi friend,
The concept of inheritance is used to make the things from general to more specific e.g. When we hear the word vehicle then we got an image in our mind that it moves from one place to another place it is used for traveling or carrying goods but the word vehicle does not specify whether it is two or three or four wheeler because it is a general word. But the word car makes a more specific image in mind than vehicle, that the car has four wheels . It concludes from the example that car is a specific word and vehicle is the general word. If we think technically to this example then vehicle is the super class (or base class or parent class) and car is the subclass or child class because every car has the features of it's parent (in this case vehicle) class.
The following kinds of inheritance are there in java.
* Simple Inheritance
* Multilevel Inheritance
Simple inheritence :
class A {
int x;
int y;
int get(int p, int q){
x=p; y=q; return(0);
}
void Show(){
System.out.println(x);
}
}
class B extends A{
public static void main(String args[]){
A a = new A();
a.get(5,6);
a.Show();
}
void display(){
System.out.println("B");
}
Multilevel Inheritence :
class A {
int x;
int y;
int get(int p, int q){
x=p; y=q; return(0);
}
void Show(){
System.out.println(x);
}
}
class B extends A{
void Showb(){
System.out.println("B");
}
}
class C extends B{
void display(){
System.out.println("C");
}
public static void main(String args[]){
A a = new A();
a.get(5,6);
a.Show();
}
}
For more information on Java inheritence visit to :
http://www.roseindia.net/java/language/
Thanks
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